# Model Context Protocol
Source: https://modelcontextprotocol.io/about/index

The open protocol that connects AI applications to the systems where context lives

<div className="landing-page">
  <section className="intro-video-section">
    <div className="intro-logo">
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/mcp.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=532f106faedf9079b75d2bdb69426588" alt="MCP Logo" data-og-width="1024" width="1024" data-og-height="1024" height="1024" data-path="mcp.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/mcp.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=037ef1df099e670b03fb91f6e976f152 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/mcp.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=8a6dbc4df8d808d98ac569887466726e 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/mcp.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=d176cf89440f18ae110a7e1843040480 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/mcp.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=fc83c85802998c592cdabe9789541140 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/mcp.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=777d825ac0e80aaa4e2bddfc7e55e629 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/mcp.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=994b7b625177d67fcd1cd21159897407 2500w" data-optimize="true" data-opv="2" />
    </div>

    <div className="intro-content">
      <h2 className="intro-title">Connect your AI applications to the world</h2>

      <p className="intro-description">
        AI-enabled tools are powerful, but they're often limited to the
        information you manually provide or require bespoke integrations.
      </p>

      <p className="intro-description">
        Whether it's reading files from your computer, searching through an
        internal or external knowledge base, or updating tasks in an project
        management tool, MCP provides a secure, standardized, *simple* way to
        give AI systems the context they need.
      </p>
    </div>
  </section>

  <section className="how-section">
    <h2 className="section-title">How it works</h2>

    <div className="steps-container">
      <div className="step-number">1</div>

      <div className="step-content">
        <h3>Choose MCP servers</h3>

        <p>
          Pick from pre-built servers for popular tools like GitHub, Google
          Drive, Slack and hundreds of others. Combine multiple servers for
          complete workflows, or easily build your own for custom integrations.
        </p>
      </div>

      <div className="step-number">2</div>

      <div className="step-content">
        <h3>Connect your AI application</h3>

        <p>
          Configure your AI application (like Claude, VS Code, or ChatGPT) to
          connect to your MCP servers. The application can now see available
          tools, resources and prompts from all connected servers.
        </p>
      </div>

      <div className="step-number">3</div>

      <div className="step-content">
        <h3>Work with context</h3>

        <p>
          Your AI-powered application can now access real data, execute actions,
          and provide more helpful responses based on your actual context.
        </p>
      </div>
    </div>
  </section>

  <section className="ecosystem-section">
    <h2 className="section-title">Join a growing ecosystem</h2>

    <div className="stats-grid">
      <a href="/docs/sdk" target="_blank" className="stat-card">
        <div className="stat-number">10</div>
        <div className="stat-label">Official SDKs</div>
      </a>

      <a href="/clients" target="_blank" className="stat-card">
        <div className="stat-number">80+</div>
        <div className="stat-label">Compatible Clients</div>
      </a>

      <a href="https://github.com/modelcontextprotocol/servers?tab=readme-ov-file#%EF%B8%8F-official-integrations" target="_blank" rel="noopener noreferrer" className="stat-card">
        <div className="stat-number">1000+</div>
        <div className="stat-label">Available Servers</div>
      </a>
    </div>
  </section>

  <section className="cta-buttons">
    <a href="/docs/getting-started/intro" className="cta-primary">
      Get Started
    </a>
  </section>
</div>


# Example Clients
Source: https://modelcontextprotocol.io/clients

A list of applications that support MCP integrations

This page provides an overview of applications that support the Model Context Protocol (MCP). Each client may support different MCP features, allowing for varying levels of integration with MCP servers.

## Feature support matrix

<div id="feature-support-matrix-wrapper">
  {/* prettier-ignore-start */}

  | Client                                                     | [Resources] | [Prompts] | [Tools] | [Discovery] | [Sampling] | [Roots] | [Elicitation] |
  | ---------------------------------------------------------- | ----------- | --------- | ------- | ----------- | ---------- | ------- | ------------- |
  | [5ire][5ire]                                               | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [AgentAI][AgentAI]                                         | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [AgenticFlow][AgenticFlow]                                 | ✅           | ✅         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [AIQL TUUI][AIQL TUUI]                                     | ✅           | ✅         | ✅       | ✅           | ✅          | ❌       | ❓             |
  | [Amazon Q CLI][Amazon Q CLI]                               | ❌           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Amazon Q IDE][Amazon Q IDE]                               | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [Amp][Amp]                                                 | ✅           | ❌         | ✅       | ❌           | ✅          | ❌       | ❓             |
  | [Apify MCP Tester][Apify MCP Tester]                       | ❌           | ❌         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [Augment Code][AugmentCode]                                | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [BeeAI Framework][BeeAI Framework]                         | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [BoltAI][BoltAI]                                           | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Call Chirp][Call Chirp]                                   | ❌           | ✅         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [Chatbox][Chatbox]                                         | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❌             |
  | [ChatGPT][ChatGPT]                                         | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [ChatWise][ChatWise]                                       | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [Claude.ai][Claude.ai]                                     | ✅           | ✅         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [Claude Code][Claude Code]                                 | ✅           | ✅         | ✅       | ❌           | ❌          | ✅       | ❓             |
  | [Claude Desktop App][Claude Desktop]                       | ✅           | ✅         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [Chorus][Chorus]                                           | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Cline][Cline]                                             | ✅           | ❌         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [CodeGPT][CodeGPT]                                         | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Continue][Continue]                                       | ✅           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Copilot-MCP][CopilotMCP]                                  | ✅           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Cursor][Cursor]                                           | ✅           | ✅         | ✅       | ❌           | ✅          | ✅       | ✅             |
  | [Daydreams Agents][Daydreams]                              | ✅           | ✅         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [ECA][ECA]                                                 | ✅           | ✅         | ✅       | ❌           | ❌          | ✅       | ❓             |
  | [Emacs Mcp][Mcp.el]                                        | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [fast-agent][fast-agent]                                   | ✅           | ✅         | ✅       | ✅           | ✅          | ✅       | ✅             |
  | [FlowDown][FlowDown]                                       | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❌             |
  | [FLUJO][FLUJO]                                             | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Genkit][Genkit]                                           | ⚠️          | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Glama][Glama]                                             | ✅           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Gemini CLI][Gemini CLI]                                   | ❌           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [GenAIScript][GenAIScript]                                 | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [GitHub Copilot coding agent][GitHubCopilotCodingAgent]    | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❌             |
  | [Goose][Goose]                                             | ✅           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [gptme][gptme]                                             | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [HyperAgent][HyperAgent]                                   | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Jenova][Jenova]                                           | ❌           | ❌         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [JetBrains AI Assistant][JetBrains AI Assistant]           | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [Kilo Code][Kilo Code]                                     | ✅           | ❌         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [Klavis AI Slack/Discord/Web][Klavis AI]                   | ✅           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Langflow][Langflow]                                       | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [LibreChat][LibreChat]                                     | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [LM Studio][LM Studio]                                     | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Lutra][Lutra]                                             | ✅           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [mcp-agent][mcp-agent]                                     | ✅           | ✅         | ✅       | ❓           | ⚠️         | ✅       | ✅             |
  | [mcp-client-chatbot][mcp-client-chatbot]                   | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [mcp-use][mcp-use]                                         | ✅           | ✅         | ✅       | ✅           | ✅          | ❌       | ✅             |
  | [modelcontextchat.com][modelcontextchat.com]               | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [MCPHub][MCPHub]                                           | ✅           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [MCPOmni-Connect][MCPOmni-Connect]                         | ✅           | ✅         | ✅       | ❓           | ✅          | ❌       | ❓             |
  | [Memex][Memex]                                             | ✅           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Microsoft Copilot Studio]                                 | ❌           | ❌         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [MindPal][MindPal]                                         | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Mistral AI: Le Chat][Mistral AI: Le Chat]                 | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [MooPoint][MooPoint]                                       | ❌           | ❌         | ✅       | ❓           | ✅          | ❌       | ❓             |
  | [Msty Studio][Msty Studio]                                 | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [NVIDIA Agent Intelligence toolkit][AIQ toolkit]           | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [OpenSumi][OpenSumi]                                       | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [oterm][oterm]                                             | ❌           | ✅         | ✅       | ❓           | ✅          | ❌       | ❓             |
  | [Postman][postman]                                         | ✅           | ✅         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [RecurseChat][RecurseChat]                                 | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Roo Code][Roo Code]                                       | ✅           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Shortwave][Shortwave]                                     | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Simtheory][Simtheory]                                     | ✅           | ✅         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [Slack MCP Client][Slack MCP Client]                       | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Sourcegraph Cody][Cody]                                   | ✅           | ❌         | ❌       | ❓           | ❌          | ❌       | ❓             |
  | [SpinAI][SpinAI]                                           | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Superinterface][Superinterface]                           | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Superjoin][Superjoin]                                     | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [systemprompt][systemprompt]                               | ✅           | ✅         | ✅       | ❓           | ✅          | ❌       | ❓             |
  | [Tambo][Tambo]                                             | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Tencent CloudBase AI DevKit][Tencent CloudBase AI DevKit] | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [TheiaAI/TheiaIDE][TheiaAI/TheiaIDE]                       | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Tome][Tome]                                               | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [TypingMind App][TypingMind App]                           | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [VS Code GitHub Copilot][VS Code]                          | ✅           | ✅         | ✅       | ✅           | ✅          | ✅       | ✅             |
  | [Warp][Warp]                                               | ✅           | ❌         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [WhatsMCP][WhatsMCP]                                       | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [Windsurf Editor][Windsurf]                                | ❌           | ❌         | ✅       | ✅           | ❌          | ❌       | ❓             |
  | [Witsy][Witsy]                                             | ❌           | ❌         | ✅       | ❓           | ❌          | ❌       | ❓             |
  | [Zed][Zed]                                                 | ❌           | ✅         | ✅       | ❌           | ❌          | ❌       | ❓             |
  | [Zencoder][Zencoder]                                       | ❌           | ❌         | ✅       | ❌           | ❌          | ❌       | ❓             |

  {/* prettier-ignore-end */}

  [Resources]: /docs/concepts/resources

  [Prompts]: /docs/concepts/prompts

  [Tools]: /docs/concepts/tools

  [Discovery]: /docs/concepts/tools#tool-discovery-and-updates

  [Sampling]: /docs/concepts/sampling

  [Roots]: /docs/concepts/roots

  [Elicitation]: /docs/concepts/elicitation

  [5ire]: https://github.com/nanbingxyz/5ire

  [AgentAI]: https://github.com/AdamStrojek/rust-agentai

  [AgenticFlow]: https://agenticflow.ai/mcp

  [AIQ toolkit]: https://github.com/NVIDIA/AIQToolkit

  [AIQL TUUI]: https://github.com/AI-QL/tuui

  [Amazon Q CLI]: https://github.com/aws/amazon-q-developer-cli

  [Amazon Q IDE]: https://aws.amazon.com/q/developer

  [Amp]: https://ampcode.com

  [Apify MCP Tester]: https://apify.com/jiri.spilka/tester-mcp-client

  [AugmentCode]: https://augmentcode.com

  [BeeAI Framework]: https://i-am-bee.github.io/beeai-framework

  [BoltAI]: https://boltai.com

  [Call Chirp]: https://www.call-chirp.com

  [Chatbox]: https://chatboxai.app

  [ChatGPT]: https://chatgpt.com

  [ChatWise]: https://chatwise.app

  [Claude.ai]: https://claude.ai

  [Claude Code]: https://claude.com/product/claude-code

  [Claude Desktop]: https://claude.ai/download

  [Chorus]: https://chorus.sh

  [Cline]: https://github.com/cline/cline

  [CodeGPT]: https://codegpt.co

  [Continue]: https://github.com/continuedev/continue

  [CopilotMCP]: https://github.com/VikashLoomba/copilot-mcp

  [Cursor]: https://cursor.com

  [Daydreams]: https://github.com/daydreamsai/daydreams

  [ECA]: https://eca.dev

  [Klavis AI]: https://www.klavis.ai/

  [Mcp.el]: https://github.com/lizqwerscott/mcp.el

  [fast-agent]: https://github.com/evalstate/fast-agent

  [FlowDown]: https://github.com/Lakr233/FlowDown

  [FLUJO]: https://github.com/mario-andreschak/flujo

  [Glama]: https://glama.ai/chat

  [Gemini CLI]: https://goo.gle/gemini-cli

  [Genkit]: https://github.com/firebase/genkit

  [GenAIScript]: https://microsoft.github.io/genaiscript/reference/scripts/mcp-tools/

  [GitHubCopilotCodingAgent]: https://docs.github.com/en/enterprise-cloud@latest/copilot/concepts/about-copilot-coding-agent

  [Goose]: https://block.github.io/goose/docs/goose-architecture/#interoperability-with-extensions

  [Jenova]: https://www.jenova.ai

  [JetBrains AI Assistant]: https://plugins.jetbrains.com/plugin/22282-jetbrains-ai-assistant

  [Kilo Code]: https://github.com/Kilo-Org/kilocode

  [Langflow]: https://github.com/langflow-ai/langflow

  [LibreChat]: https://github.com/danny-avila/LibreChat

  [LM Studio]: https://lmstudio.ai

  [Lutra]: https://lutra.ai

  [mcp-agent]: https://github.com/lastmile-ai/mcp-agent

  [mcp-client-chatbot]: https://github.com/cgoinglove/mcp-client-chatbot

  [mcp-use]: https://github.com/pietrozullo/mcp-use

  [modelcontextchat.com]: https://modelcontextchat.com

  [MCPHub]: https://github.com/ravitemer/mcphub.nvim

  [MCPOmni-Connect]: https://github.com/Abiorh001/mcp_omni_connect

  [Memex]: https://memex.tech/

  [Microsoft Copilot Studio]: https://learn.microsoft.com/en-us/microsoft-copilot-studio/agent-extend-action-mcp

  [MindPal]: https://mindpal.io

  [Mistral AI: Le Chat]: https://chat.mistral.ai

  [MooPoint]: https://moopoint.io

  [Msty Studio]: https://msty.ai

  [OpenSumi]: https://github.com/opensumi/core

  [oterm]: https://github.com/ggozad/oterm

  [Postman]: https://postman.com/downloads

  [RecurseChat]: https://recurse.chat/

  [Roo Code]: https://roocode.com

  [Shortwave]: https://www.shortwave.com

  [Simtheory]: https://simtheory.ai

  [Slack MCP Client]: https://github.com/tuannvm/slack-mcp-client

  [Cody]: https://sourcegraph.com/cody

  [SpinAI]: https://spinai.dev

  [Superinterface]: https://superinterface.ai

  [Superjoin]: https://superjoin.ai

  [systemprompt]: https://systemprompt.io

  [Tambo]: https://tambo.co

  [Tencent CloudBase AI DevKit]: https://docs.cloudbase.net/ai/agent/mcp

  [TheiaAI/TheiaIDE]: https://eclipsesource.com/blogs/2024/12/19/theia-ide-and-theia-ai-support-mcp/

  [Tome]: https://github.com/runebookai/tome

  [TypingMind App]: https://www.typingmind.com

  [VS Code]: https://code.visualstudio.com/

  [Windsurf]: https://codeium.com/windsurf

  [gptme]: https://github.com/gptme/gptme

  [Warp]: https://www.warp.dev/

  [WhatsMCP]: https://wassist.app/mcp/

  [Witsy]: https://github.com/nbonamy/witsy

  [Zed]: https://zed.dev

  [Zencoder]: https://zencoder.ai

  [HyperAgent]: https://github.com/hyperbrowserai/HyperAgent
</div>

## Client details

### 5ire

[5ire](https://github.com/nanbingxyz/5ire) is an open source cross-platform desktop AI assistant that supports tools through MCP servers.

**Key features:**

* Built-in MCP servers can be quickly enabled and disabled.
* Users can add more servers by modifying the configuration file.
* It is open-source and user-friendly, suitable for beginners.
* Future support for MCP will be continuously improved.

### AgentAI

[AgentAI](https://github.com/AdamStrojek/rust-agentai) is a Rust library designed to simplify the creation of AI agents. The library includes seamless integration with MCP Servers.

[Example of MCP Server integration](https://github.com/AdamStrojek/rust-agentai/blob/master/examples/tools_mcp.rs)

**Key features:**

* Multi-LLM – We support most LLM APIs (OpenAI, Anthropic, Gemini, Ollama, and all OpenAI API Compatible).
* Built-in support for MCP Servers.
* Create agentic flows in a type- and memory-safe language like Rust.

### AgenticFlow

[AgenticFlow](https://agenticflow.ai/) is a no-code AI platform that helps you build agents that handle sales, marketing, and creative tasks around the clock. Connect 2,500+ APIs and 10,000+ tools securely via MCP.

**Key features:**

* No-code AI agent creation and workflow building.
* Access a vast library of 10,000+ tools and 2,500+ APIs through MCP.
* Simple 3-step process to connect MCP servers.
* Securely manage connections and revoke access anytime.

**Learn more:**

* [AgenticFlow MCP Integration](https://agenticflow.ai/mcp)

### AIQL TUUI

[AIQL TUUI] is a native, cross-platform desktop AI chat application with MCP support. It supports multiple AI providers (e.g., Anthropic, Cloudflare, Deepseek, OpenAI, Qwen), local AI models (via vLLM, Ray, etc.), and aggregated API platforms (such as Deepinfra, Openrouter, and more).

**Key features:**

* **Dynamic LLM API & Agent Switching**: Seamlessly toggle between different LLM APIs and agents on the fly.
* **Comprehensive Capabilities Support**: Built-in support for tools, prompts, resources, and sampling methods.
* **Configurable Agents**: Enhanced flexibility with selectable and customizable tools via agent settings.
* **Advanced Sampling Control**: Modify sampling parameters and leverage multi-round sampling for optimal results.
* **Cross-Platform Compatibility**: Fully compatible with macOS, Windows, and Linux.
* **Free & Open-Source (FOSS)**: Permissive licensing allows modifications and custom app bundling.

**Learn more:**

* [TUUI document](https://www.tuui.com/)
* [AIQL GitHub repository](https://github.com/AI-QL)

### Amazon Q CLI

[Amazon Q CLI](https://github.com/aws/amazon-q-developer-cli) is an open-source, agentic coding assistant for terminals.

**Key features:**

* Full support for MCP servers.
* Edit prompts using your preferred text editor.
* Access saved prompts instantly with `@`.
* Control and organize AWS resources directly from your terminal.
* Tools, profiles, context management, auto-compact, and so much more!

**Get Started**

```bash
brew install amazon-q
```

### Amazon Q IDE

[Amazon Q IDE](https://aws.amazon.com/q/developer) is an open-source, agentic coding assistant for IDEs.

**Key features:**

* Support for the VSCode, JetBrains, Visual Studio, and Eclipse IDEs.
* Control and organize AWS resources directly from your IDE.
* Manage permissions for each MCP tool via the IDE user interface.

### Apify MCP Tester

[Apify MCP Tester](https://github.com/apify/tester-mcp-client) is an open-source client that connects to any MCP server using Server-Sent Events (SSE).
It is a standalone Apify Actor designed for testing MCP servers over SSE, with support for Authorization headers.
It uses plain JavaScript (old-school style) and is hosted on Apify, allowing you to run it without any setup.

**Key features:**

* Connects to any MCP server via SSE.
* Works with the [Apify MCP Server](https://apify.com/apify/actors-mcp-server) to interact with one or more Apify [Actors](https://apify.com/store).
* Dynamically utilizes tools based on context and user queries (if supported by the server).

### Amp

[Amp](https://ampcode.com) is an agentic coding tool built by Sourcegraph. It runs in VS Code (and compatible forks like Cursor, Windsurf, and VSCodium) and as a command-line tool. It’s also multiplayer — you can share threads and collaborate with your team.

**Key features:**

* Granular control over enabled tools and permissions
* Support for MCP servers defined in VS Code `mcp.json`

### Augment Code

[Augment Code](https://augmentcode.com) is an AI-powered coding platform for VS Code and JetBrains with autonomous agents, chat, and completions. Both local and remote agents are backed by full codebase awareness and native support for MCP, enabling enhanced context through external sources and tools.

**Key features:**

* Full MCP support in local and remote agents.
* Add additional context through MCP servers.
* Automate your development workflows with MCP tools.
* Works in VS Code and JetBrains IDEs.

### BeeAI Framework

[BeeAI Framework](https://i-am-bee.github.io/beeai-framework) is an open-source framework for building, deploying, and serving powerful agentic workflows at scale. The framework includes the **MCP Tool**, a native feature that simplifies the integration of MCP servers into agentic workflows.

**Key features:**

* Seamlessly incorporate MCP tools into agentic workflows.
* Quickly instantiate framework-native tools from connected MCP client(s).
* Planned future support for agentic MCP capabilities.

**Learn more:**

* [Example of using MCP tools in agentic workflow](https://i-am-bee.github.io/beeai-framework/#/typescript/tools?id=using-the-mcptool-class)

### BoltAI

[BoltAI](https://boltai.com) is a native, all-in-one AI chat client with MCP support. BoltAI supports multiple AI providers (OpenAI, Anthropic, Google AI...), including local AI models (via Ollama, LM Studio or LMX)

**Key features:**

* MCP Tool integrations: once configured, user can enable individual MCP server in each chat
* MCP quick setup: import configuration from Claude Desktop app or Cursor editor
* Invoke MCP tools inside any app with AI Command feature
* Integrate with remote MCP servers in the mobile app

**Learn more:**

* [BoltAI docs](https://boltai.com/docs/plugins/mcp-servers)
* [BoltAI website](https://boltai.com)

### Call Chirp

[Call Chirp] [https://www.call-chirp.com](https://www.call-chirp.com) uses AI to capture every critical detail from your business conversations, automatically syncing insights to your CRM and project tools so you never miss another deal-closing moment.

**Key features:**

* Save transcriptions from Zoom, Google Meet, and more
* MCP Tools for voice AI agents
* Remote MCP servers support

### Chatbox

Chatbox is a better UI and desktop app for ChatGPT, Claude, and other LLMs, available on Windows, Mac, Linux, and the web. It's open-source and has garnered 37K stars⭐ on GitHub.

**Key features:**

* Tools support for MCP servers
* Support both local and remote MCP servers
* Built-in MCP servers marketplace

### ChatGPT

ChatGPT is OpenAI's AI assistant that provides MCP support for remote servers to conduct deep research.

**Key features:**

* Support for MCP via connections UI in settings
* Access to search tools from configured MCP servers for deep research
* Enterprise-grade security and compliance features

### ChatWise

ChatWise is a desktop-optimized, high-performance chat application that lets you bring your own API keys. It supports a wide range of LLMs and integrates with MCP to enable tool workflows.

**Key features:**

* Tools support for MCP servers
* Offer built-in tools like web search, artifacts and image generation.

### Claude Code

Claude Code is an interactive agentic coding tool from Anthropic that helps you code faster through natural language commands. It supports MCP integration for resources, prompts, tools, and roots, and also functions as an MCP server to integrate with other clients.

**Key features:**

* Full support for resources, prompts, tools, and roots from MCP servers
* Offers its own tools through an MCP server for integrating with other MCP clients

### Claude.ai

[Claude.ai](https://claude.ai) is Anthropic's web-based AI assistant that provides MCP support for remote servers.

**Key features:**

* Support for remote MCP servers via integrations UI in settings
* Access to tools, prompts, and resources from configured MCP servers
* Seamless integration with Claude's conversational interface
* Enterprise-grade security and compliance features

### Claude Desktop App

The Claude desktop application provides comprehensive support for MCP, enabling deep integration with local tools and data sources.

**Key features:**

* Full support for resources, allowing attachment of local files and data
* Support for prompt templates
* Tool integration for executing commands and scripts
* Local server connections for enhanced privacy and security

### Chorus

[Chorus](https://chorus.sh) is a native Mac app for chatting with AIs. Chat with multiple models at once, run tools and MCPs, create projects, quick chat, bring your own key, all in a blazing fast, keyboard shortcut friendly app.

**Key features:**

* MCP support with one-click install
* Built in tools, like web search, terminal, and image generation
* Chat with multiple models at once (cloud or local)
* Create projects with scoped memory
* Quick chat with an AI that can see your screen

### Cline

[Cline](https://github.com/cline/cline) is an autonomous coding agent in VS Code that edits files, runs commands, uses a browser, and more–with your permission at each step.

**Key features:**

* Create and add tools through natural language (e.g. "add a tool that searches the web")
* Share custom MCP servers Cline creates with others via the `~/Documents/Cline/MCP` directory
* Displays configured MCP servers along with their tools, resources, and any error logs

### CodeGPT

[CodeGPT](https://codegpt.co) is a popular VS Code and Jetbrains extension that brings AI-powered coding assistance to your editor. It supports integration with MCP servers for tools, allowing users to leverage external AI capabilities directly within their development workflow.

**Key features:**

* Use MCP tools from any configured MCP server
* Seamless integration with VS Code and Jetbrains UI
* Supports multiple LLM providers and custom endpoints

**Learn more:**

* [CodeGPT Documentation](https://docs.codegpt.co/)

### Continue

[Continue](https://github.com/continuedev/continue) is an open-source AI code assistant, with built-in support for all MCP features.

**Key features:**

* Type "@" to mention MCP resources
* Prompt templates surface as slash commands
* Use both built-in and MCP tools directly in chat
* Supports VS Code and JetBrains IDEs, with any LLM

### Copilot-MCP

[Copilot-MCP](https://github.com/VikashLoomba/copilot-mcp) enables AI coding assistance via MCP.

**Key features:**

* Support for MCP tools and resources
* Integration with development workflows
* Extensible AI capabilities

### Cursor

[Cursor](https://docs.cursor.com/context/mcp#protocol-support) is an AI code editor.

**Key features:**

* Support for MCP tools in Cursor Composer
* Support for roots
* Support for prompts
* Support for elicitation
* Support for both STDIO and SSE

### Daydreams

[Daydreams](https://github.com/daydreamsai/daydreams) is a generative agent framework for executing anything onchain

**Key features:**

* Supports MCP Servers in config
* Exposes MCP Client

### ECA - Editor Code Assistant

[ECA](https://eca.dev) is a Free and open-source editor-agnostic tool that aims to easily link LLMs and Editors, giving the best UX possible for AI pair programming using a well-defined protocol

**Key features:**

* **Editor-agnostic**: protocol for any editor to integrate.
* **Single configuration**: Configure eca making it work the same in any editor via global or local configs.
* **Chat** interface: ask questions, review code, work together to code.
* **Agentic**: let LLM work as an agent with its native tools and MCPs you can configure.
* **Context**: support: giving more details about your code to the LLM, including MCP resources and prompts.
* **Multi models**: Login to OpenAI, Anthropic, Copilot, Ollama local models and many more.
* **OpenTelemetry**: Export metrics of tools, prompts, server usage.

**Learn more:**

* [ECA website](https://eca.dev)
* [ECA source code](https://github.com/editor-code-assistant/eca)

### Emacs Mcp

[Emacs Mcp](https://github.com/lizqwerscott/mcp.el) is an Emacs client designed to interface with MCP servers, enabling seamless connections and interactions. It provides MCP tool invocation support for AI plugins like [gptel](https://github.com/karthink/gptel) and [llm](https://github.com/ahyatt/llm), adhering to Emacs' standard tool invocation format. This integration enhances the functionality of AI tools within the Emacs ecosystem.

**Key features:**

* Provides MCP tool support for Emacs.

### fast-agent

[fast-agent](https://github.com/evalstate/fast-agent) is a Python Agent framework, with simple declarative support for creating Agents and Workflows, with full multi-modal support for Anthropic and OpenAI models.

**Key features:**

* PDF and Image support, based on MCP Native types
* Interactive front-end to develop and diagnose Agent applications, including passthrough and playback simulators
* Built in support for "Building Effective Agents" workflows.
* Deploy Agents as MCP Servers

### FlowDown

[FlowDown](https://github.com/Lakr233/FlowDown) is a blazing fast and smooth client app for using AI/LLM, with a strong emphasis on privacy and user experience. It supports MCP servers to extend its capabilities with external tools, allowing users to build powerful, customized workflows.

**Key features:**

* **Seamless MCP Integration**: Easily connect to MCP servers to utilize a wide range of external tools.
* **Privacy-First Design**: Your data stays on your device. We don't collect any user data, ensuring complete privacy.
* **Lightweight & Efficient**: A compact and optimized design ensures a smooth and responsive experience with any AI model.
* **Broad Compatibility**: Works with all OpenAI-compatible service providers and supports local offline models through MLX.
* **Rich User Experience**: Features beautifully formatted Markdown, blazing-fast text rendering, and intelligent, automated chat titling.

**Learn more:**

* [FlowDown website](https://flowdown.ai/)
* [FlowDown documentation](https://apps.qaq.wiki/docs/flowdown/)

### FLUJO

Think n8n + ChatGPT. FLUJO is an desktop application that integrates with MCP to provide a workflow-builder interface for AI interactions. Built with Next.js and React, it supports both online and offline (ollama) models, it manages API Keys and environment variables centrally and can install MCP Servers from GitHub. FLUJO has an ChatCompletions endpoint and flows can be executed from other AI applications like Cline, Roo or Claude.

**Key features:**

* Environment & API Key Management
* Model Management
* MCP Server Integration
* Workflow Orchestration
* Chat Interface

### Genkit

[Genkit](https://github.com/firebase/genkit) is a cross-language SDK for building and integrating GenAI features into applications. The [genkitx-mcp](https://github.com/firebase/genkit/tree/main/js/plugins/mcp) plugin enables consuming MCP servers as a client or creating MCP servers from Genkit tools and prompts.

**Key features:**

* Client support for tools and prompts (resources partially supported)
* Rich discovery with support in Genkit's Dev UI playground
* Seamless interoperability with Genkit's existing tools and prompts
* Works across a wide variety of GenAI models from top providers

### Glama

[Glama](https://glama.ai/chat) is a comprehensive AI workspace and integration platform that offers a unified interface to leading LLM providers, including OpenAI, Anthropic, and others. It supports the Model Context Protocol (MCP) ecosystem, enabling developers and enterprises to easily discover, build, and manage MCP servers.

**Key features:**

* Integrated [MCP Server Directory](https://glama.ai/mcp/servers)
* Integrated [MCP Tool Directory](https://glama.ai/mcp/tools)
* Host MCP servers and access them via the Chat or SSE endpoints
  – Ability to chat with multiple LLMs and MCP servers at once
* Upload and analyze local files and data
* Full-text search across all your chats and data

### GenAIScript

Programmatically assemble prompts for LLMs using [GenAIScript](https://microsoft.github.io/genaiscript/) (in JavaScript). Orchestrate LLMs, tools, and data in JavaScript.

**Key features:**

* JavaScript toolbox to work with prompts
* Abstraction to make it easy and productive
* Seamless Visual Studio Code integration

### Goose

[Goose](https://github.com/block/goose) is an open source AI agent that supercharges your software development by automating coding tasks.

**Key features:**

* Expose MCP functionality to Goose through tools.
* MCPs can be installed directly via the [extensions directory](https://block.github.io/goose/v1/extensions/), CLI, or UI.
* Goose allows you to extend its functionality by [building your own MCP servers](https://block.github.io/goose/docs/tutorials/custom-extensions).
* Includes built-in tools for development, web scraping, automation, memory, and integrations with JetBrains and Google Drive.

### GitHub Copilot coding agent

Delegate tasks to [GitHub Copilot coding agent](https://docs.github.com/en/copilot/concepts/about-copilot-coding-agent) and let it work in the background while you stay focused on the highest-impact and most interesting work

**Key features:**

* Delegate tasks to Copilot from GitHub Issues, Visual Studio Code, GitHub Copilot Chat or from your favorite MCP host using the GitHub MCP Server
* Tailor Copilot to your project by [customizing the agent's development environment](https://docs.github.com/en/enterprise-cloud@latest/copilot/how-tos/agents/copilot-coding-agent/customizing-the-development-environment-for-copilot-coding-agent#preinstalling-tools-or-dependencies-in-copilots-environment) or [writing custom instructions](https://docs.github.com/en/enterprise-cloud@latest/copilot/how-tos/agents/copilot-coding-agent/best-practices-for-using-copilot-to-work-on-tasks#adding-custom-instructions-to-your-repository)
* [Augment Copilot's context and capabilities with MCP tools](https://docs.github.com/en/enterprise-cloud@latest/copilot/how-tos/agents/copilot-coding-agent/extending-copilot-coding-agent-with-mcp), with support for both local and remote MCP servers

### gptme

[gptme](https://github.com/gptme/gptme) is a open-source terminal-based personal AI assistant/agent, designed to assist with programming tasks and general knowledge work.

**Key features:**

* CLI-first design with a focus on simplicity and ease of use
* Rich set of built-in tools for shell commands, Python execution, file operations, and web browsing
* Local-first approach with support for multiple LLM providers
* Open-source, built to be extensible and easy to modify

### HyperAgent

[HyperAgent](https://github.com/hyperbrowserai/HyperAgent) is Playwright supercharged with AI. With HyperAgent, you no longer need brittle scripts, just powerful natural language commands. Using MCP servers, you can extend the capability of HyperAgent, without having to write any code.

**Key features:**

* AI Commands: Simple APIs like page.ai(), page.extract() and executeTask() for any AI automation
* Fallback to Regular Playwright: Use regular Playwright when AI isn't needed
* Stealth Mode – Avoid detection with built-in anti-bot patches
* Cloud Ready – Instantly scale to hundreds of sessions via [Hyperbrowser](https://www.hyperbrowser.ai/)
* MCP Client – Connect to tools like Composio for full workflows (e.g. writing web data to Google Sheets)

### Jenova

[Jenova](https://jenova.ai) is the best MCP client for non-technical users, especially on mobile.

**Key features:**

* 30+ pre-integrated MCP servers with one-click integration of custom servers
* MCP recommendation capability that suggests the best servers for specific tasks
* Multi-agent architecture with leading tool use reliability and scalability, supporting unlimited concurrent MCP server connections through RAG-powered server metadata
* Model agnostic platform supporting any leading LLMs (OpenAI, Anthropic, Google, etc.)
* Unlimited chat history and global persistent memory powered by RAG
* Easy creation of custom agents with custom models, instructions, knowledge bases, and MCP servers
* Local MCP server (STDIO) support coming soon with desktop apps

### JetBrains AI Assistant

[JetBrains AI Assistant](https://plugins.jetbrains.com/plugin/22282-jetbrains-ai-assistant) plugin provides AI-powered features for software development available in all JetBrains IDEs.

**Key features:**

* Unlimited code completion powered by Mellum, JetBrains’ proprietary AI model.
* Context-aware AI chat that understands your code and helps you in real time.
* Access to top-tier models from OpenAI, Anthropic, and Google.
* Offline mode with connected local LLMs via Ollama or LM Studio.
* Deep integration into IDE workflows, including code suggestions in the editor, VCS assistance, runtime error explanation, and more.

### Kilo Code

[Kilo Code](https://github.com/Kilo-Org/kilocode) is an autonomous coding AI dev team in VS Code that edits files, runs commands, uses a browser, and more.

**Key features:**

* Create and add tools through natural language (e.g. "add a tool that searches the web")
* Discover MCP servers via the MCP Marketplace
* One click MCP server installs via MCP Marketplace
* Displays configured MCP servers along with their tools, resources, and any error logs

### Klavis AI Slack/Discord/Web

[Klavis AI](https://www.klavis.ai/) is an Open-Source Infra to Use, Build & Scale MCPs with ease.

**Key features:**

* Slack/Discord/Web MCP clients for using MCPs directly
* Simple web UI dashboard for easy MCP configuration
* Direct OAuth integration with Slack & Discord Clients and MCP Servers for secure user authentication
* SSE transport support
* Open-source infrastructure ([GitHub repository](https://github.com/Klavis-AI/klavis))

**Learn more:**

* [Demo video showing MCP usage in Slack/Discord](https://youtu.be/9-QQAhrQWw8)

### Langflow

Langflow is an open-source visual builder that lets developers rapidly prototype and build AI applications, it integrates with the Model Context Protocol (MCP) as both an MCP server and an MCP client.

**Key features:**

* Full support for using MCP server tools to build agents and flows.
* Export agents and flows as MCP server
* Local & remote server connections for enhanced privacy and security

**Learn more:**

* [Demo video showing how to use Langflow as both an MCP client & server](https://www.youtube.com/watch?v=pEjsaVVPjdI)

### LibreChat

[LibreChat](https://github.com/danny-avila/LibreChat) is an open-source, customizable AI chat UI that supports multiple AI providers, now including MCP integration.

**Key features:**

* Extend current tool ecosystem, including [Code Interpreter](https://www.librechat.ai/docs/features/code_interpreter) and Image generation tools, through MCP servers
* Add tools to customizable [Agents](https://www.librechat.ai/docs/features/agents), using a variety of LLMs from top providers
* Open-source and self-hostable, with secure multi-user support
* Future roadmap includes expanded MCP feature support

### LM Studio

[LM Studio](https://lmstudio.ai) is a cross-platform desktop app for discovering, downloading, and running open-source LLMs locally. You can now connect local models to tools via Model Context Protocol (MCP).

**Key features:**

* Use MCP servers with local models on your computer. Add entries to `mcp.json` and save to get started.
* Tool confirmation UI: when a model calls a tool, you can confirm the call in the LM Studio app.
* Cross-platform: runs on macOS, Windows, and Linux, one-click installer with no need to fiddle in the command line
* Supports GGUF (llama.cpp) or MLX models with GPU acceleration
* GUI & terminal mode: use the LM Studio app or CLI (lms) for scripting and automation

**Learn more:**

* [Docs: Using MCP in LM Studio](https://lmstudio.ai/docs/app/plugins/mcp)
* [Create a 'Add to LM Studio' button for your server](https://lmstudio.ai/docs/app/plugins/mcp/deeplink)
* [Announcement blog: LM Studio + MCP](https://lmstudio.ai/blog/mcp)

### Lutra

[Lutra](https://lutra.ai) is an AI agent that transforms conversations into actionable, automated workflows.

**Key features:**

* Easy MCP Integration: Connecting Lutra to MCP servers is as simple as providing the server URL; Lutra handles the rest behind the scenes.
* Chat to Take Action: Lutra understands your conversational context and goals, automatically integrating with your existing apps to perform tasks.
* Reusable Playbooks: After completing a task, save the steps as reusable, automated workflows—simplifying repeatable processes and reducing manual effort.
* Shareable Automations: Easily share your saved playbooks with teammates to standardize best practices and accelerate collaborative workflows.

**Learn more:**

* [Lutra AI agent explained](https://www.youtube.com/watch?v=W5ZpN0cMY70)

### mcp-agent

[mcp-agent] is a simple, composable framework to build agents using Model Context Protocol.

**Key features:**

* Automatic connection management of MCP servers.
* Expose tools from multiple servers to an LLM.
* Implements every pattern defined in [Building Effective Agents](https://www.anthropic.com/research/building-effective-agents).
* Supports workflow pause/resume signals, such as waiting for human feedback.

### mcp-client-chatbot

[mcp-client-chatbot](https://github.com/cgoinglove/mcp-client-chatbot) is a local-first chatbot built with Vercel's Next.js, AI SDK, and Shadcn UI.

**Key features:**

* It supports standard MCP tool calling and includes both a custom MCP server and a standalone UI for testing MCP tools outside the chat flow.
* All MCP tools are provided to the LLM by default, but the project also includes an optional `@toolname` mention feature to make tool invocation more explicit—particularly useful when connecting to multiple MCP servers with many tools.
* Visual workflow builder that lets you create custom tools by chaining LLM nodes and MCP tools together. Published workflows become callable as `@workflow_name` tools in chat, enabling complex multi-step automation sequences.

### mcp-use

[mcp-use] is an open source python library to very easily connect any LLM to any MCP server both locally and remotely.

**Key features:**

* Very simple interface to connect any LLM to any MCP.
* Support the creation of custom agents, workflows.
* Supports connection to multiple MCP servers simultaneously.
* Supports all langchain supported models, also locally.
* Offers efficient tool orchestration and search functionalities.

### modelcontextchat.com

[modelcontextchat.com](https://modelcontextchat.com) is a web-based MCP client designed for working with remote MCP servers, featuring comprehensive authentication support and integration with OpenRouter.

**Key features:**

* Web-based interface for remote MCP server connections
* Header-based Authorization support for secure server access
* OAuth authentication integration
* OpenRouter API Key support for accessing various LLM providers
* No installation required - accessible from any web browser

### MCPHub

[MCPHub] is a powerful Neovim plugin that integrates MCP (Model Context Protocol) servers into your workflow.

**Key features:**

* Install, configure and manage MCP servers with an intuitive UI.
* Built-in Neovim MCP server with support for file operations (read, write, search, replace), command execution, terminal integration, LSP integration, buffers, and diagnostics.
* Create Lua-based MCP servers directly in Neovim.
* Inegrates with popular Neovim chat plugins Avante.nvim and CodeCompanion.nvim

### MCPOmni-Connect

[MCPOmni-Connect](https://github.com/Abiorh001/mcp_omni_connect) is a versatile command-line interface (CLI) client designed to connect to various Model Context Protocol (MCP) servers using both stdio and SSE transport.

**Key features:**

* Support for resources, prompts, tools, and sampling
* Agentic mode with ReAct and orchestrator capabilities
* Seamless integration with OpenAI models and other LLMs
* Dynamic tool and resource management across multiple servers
* Support for both stdio and SSE transport protocols
* Comprehensive tool orchestration and resource analysis capabilities

### Memex

[Memex](https://memex.tech/) is the first MCP client and MCP server builder - all-in-one desktop app. Unlike traditional MCP clients that only consume existing servers, Memex can create custom MCP servers from natural language prompts, immediately integrate them into its toolkit, and use them to solve problems—all within a single conversation.

**Key features:**

* **Prompt-to-MCP Server**: Generate fully functional MCP servers from natural language descriptions
* **Self-Testing & Debugging**: Autonomously test, debug, and improve created MCP servers
* **Universal MCP Client**: Works with any MCP server through intuitive, natural language integration
* **Curated MCP Directory**: Access to tested, one-click installable MCP servers (Neon, Netlify, GitHub, Context7, and more)
* **Multi-Server Orchestration**: Leverage multiple MCP servers simultaneously for complex workflows

**Learn more:**

* [Memex Launch 2: MCP Teams and Agent API](https://memex.tech/blog/memex-launch-2-mcp-teams-and-agent-api-private-preview-125f)

### Microsoft Copilot Studio

[Microsoft Copilot Studio] is a robust SaaS platform designed for building custom AI-driven applications and intelligent agents, empowering developers to create, deploy, and manage sophisticated AI solutions.

**Key features:**

* Support for MCP tools
* Extend Copilot Studio agents with MCP servers
* Leveraging Microsoft unified, governed, and secure API management solutions

### MindPal

[MindPal](https://mindpal.io) is a no-code platform for building and running AI agents and multi-agent workflows for business processes.

**Key features:**

* Build custom AI agents with no-code
* Connect any SSE MCP server to extend agent tools
* Create multi-agent workflows for complex business processes
* User-friendly for both technical and non-technical professionals
* Ongoing development with continuous improvement of MCP support

**Learn more:**

* [MindPal MCP Documentation](https://docs.mindpal.io/agent/mcp)

### MooPoint

[MooPoint](https://moopoint.io)

MooPoint is a web-based AI chat platform built for developers and advanced users, letting you interact with multiple large language models (LLMs) through a single, unified interface. Connect your own API keys (OpenAI, Anthropic, and more) and securely manage custom MCP server integrations.

**Key features:**

* Accessible from any PC or smartphone—no installation required
* Choose your preferred LLM provider
* Supports `SSE`, `Streamable HTTP`, `npx`, and `uvx` MCP servers
* OAuth and sampling support
* New features added daily

### Mistral AI: Le Chat

[Mistral AI: Le Chat](https://mistral.ai) is Mistral AI assistant with MCP support for remote servers and enterprise workflows.

**Key features:**

* Remote MCP server integration
* Enterprise-grade security
* Low-latency, high-throughput interactions with structured data

**Learn more:**

* [Mistral MCP Documentation](https://help.mistral.ai/en/collections/911943-connectors)

### Msty Studio

[Msty Studio](https://msty.ai) is a privacy-first AI productivity platform that seamlessly integrates local and online language models (LLMs) into customizable workflows. Designed for both technical and non-technical users, Msty Studio offers a suite of tools to enhance AI interactions, automate tasks, and maintain full control over data and model behavior.

**Key features:**

* **Toolbox & Toolsets**: Connect AI models to local tools and scripts using MCP-compliant configurations. Group tools into Toolsets to enable dynamic, multi-step workflows within conversations.
* **Turnstiles**: Create automated, multi-step AI interactions, allowing for complex data processing and decision-making flows.
* **Real-Time Data Integration**: Enhance AI responses with up-to-date information by integrating real-time web search capabilities.
* **Split Chats & Branching**: Engage in parallel conversations with multiple models simultaneously, enabling comparative analysis and diverse perspectives.

**Learn more:**

* [Msty Studio Documentation](https://docs.msty.studio/features/toolbox/tools)

### NVIDIA Agent Intelligence (AIQ) toolkit

[NVIDIA Agent Intelligence (AIQ) toolkit](https://github.com/NVIDIA/AIQToolkit) is a flexible, lightweight, and unifying library that allows you to easily connect existing enterprise agents to data sources and tools across any framework.

**Key features:**

* Acts as an MCP **client** to consume remote tools
* Acts as an MCP **server** to expose tools
* Framework agnostic and compatible with LangChain, CrewAI, Semantic Kernel, and custom agents
* Includes built-in observability and evaluation tools

**Learn more:**

* [AIQ toolkit GitHub repository](https://github.com/NVIDIA/AIQToolkit)
* [AIQ toolkit MCP documentation](https://docs.nvidia.com/aiqtoolkit/latest/workflows/mcp/index.html)

### OpenSumi

[OpenSumi](https://github.com/opensumi/core) is a framework helps you quickly build AI Native IDE products.

**Key features:**

* Supports MCP tools in OpenSumi
* Supports built-in IDE MCP servers and custom MCP servers

### oterm

[oterm] is a terminal client for Ollama allowing users to create chats/agents.

**Key features:**

* Support for multiple fully customizable chat sessions with Ollama connected with tools.
* Support for MCP tools.

### Roo Code

[Roo Code](https://roocode.com) enables AI coding assistance via MCP.

**Key features:**

* Support for MCP tools and resources
* Integration with development workflows
* Extensible AI capabilities

### Postman

[Postman](https://postman.com/downloads) is the most popular API client and now supports MCP server testing and debugging.

**Key features:**

* Full support of all major MCP features (tools, prompts, resources, and subscriptions)
* Fast, seamless UI for debugging MCP capabilities
* MCP config integration (Claude, VSCode, etc.) for fast first-time experience in testing MCPs
* Integration with history, variables, and collections for reuse and collaboration

### RecurseChat

[RecurseChat](https://recurse.chat) is a powerful, fast, local-first chat client with MCP support. RecurseChat supports multiple AI providers including LLaMA.cpp, Ollama, and OpenAI, Anthropic.

**Key features:**

* Local AI: Support MCP with Ollama models.
* MCP Tools: Individual MCP server management. Easily visualize the connection states of MCP servers.
* MCP Import: Import configuration from Claude Desktop app or JSON

**Learn more:**

* [RecurseChat docs](https://recurse.chat/docs/features/mcp/)

### Shortwave

[Shortwave](https://www.shortwave.com) is an AI-powered email client that supports MCP tools to enhance email productivity and workflow automation.

**Key features:**

* MCP tool integration for enhanced email workflows
* Rich UI for adding, managing and interacting with a wide range of MCP servers
* Support for both remote (Streamable HTTP and SSE) and local (Stdio) MCP servers
* AI assistance for managing your emails, calendar, tasks and other third-party services

### Simtheory

Simtheory is an agentic AI workspace that unifies multiple AI models, tools, and capabilities under a single subscription. It provides comprehensive MCP support through its MCP Store, allowing users to extend their workspace with productivity tools and integrations.

**Key features:**

* **MCP Store**: Marketplace for productivity tools and MCP server integrations
* **Parallel Tasking**: Run multiple AI tasks simultaneously with MCP tool support
* **Model Catalogue**: Access to frontier models with MCP tool integration
* **Hosted MCP Servers**: Plug-and-play MCP integrations with no technical setup
* **Advanced MCPs**: Specialized tools like Tripo3D (3D creation), Podcast Maker, and Video Maker
* **Enterprise Ready**: Flexible workspaces with granular access control for MCP tools

**Learn more:**

* [Simtheory website](https://simtheory.ai)

### Slack MCP Client

[Slack MCP Client](https://github.com/tuannvm/slack-mcp-client) acts as a bridge between Slack and Model Context Protocol (MCP) servers. Using Slack as the interface, it enables large language models (LLMs) to connect and interact with various MCP servers through standardized MCP tools.

**Key features:**

* **Supports Popular LLM Providers:** Integrates seamlessly with leading large language model providers such as OpenAI, Anthropic, and Ollama, allowing users to leverage advanced conversational AI and orchestration capabilities within Slack.
* **Dynamic and Secure Integration:** Supports dynamic registration of MCP tools, works in both channels and direct messages and manages credentials securely via environment variables or Kubernetes secrets.
* **Easy Deployment and Extensibility:** Offers official Docker images, a Helm chart for Kubernetes, and Docker Compose for local development, making it simple to deploy, configure, and extend with additional MCP servers or tools.

### Sourcegraph Cody

[Cody](https://openctx.org/docs/providers/modelcontextprotocol) is Sourcegraph's AI coding assistant, which implements MCP through OpenCTX.

**Key features:**

* Support for MCP resources
* Integration with Sourcegraph's code intelligence
* Uses OpenCTX as an abstraction layer
* Future support planned for additional MCP features

### SpinAI

[SpinAI](https://spinai.dev) is an open-source TypeScript framework for building observable AI agents. The framework provides native MCP compatibility, allowing agents to seamlessly integrate with MCP servers and tools.

**Key features:**

* Built-in MCP compatibility for AI agents
* Open-source TypeScript framework
* Observable agent architecture
* Native support for MCP tools integration

### Superinterface

[Superinterface](https://superinterface.ai) is AI infrastructure and a developer platform to build in-app AI assistants with support for MCP, interactive components, client-side function calling and more.

**Key features:**

* Use tools from MCP servers in assistants embedded via React components or script tags
* SSE transport support
* Use any AI model from any AI provider (OpenAI, Anthropic, Ollama, others)

### Superjoin

[Superjoin](https://superjoin.ai) brings the power of MCP directly into Google Sheets extension. With Superjoin, users can access and invoke MCP tools and agents without leaving their spreadsheets, enabling powerful AI workflows and automation right where their data lives.

**Key features:**

* Native Google Sheets add-on providing effortless access to MCP capabilities
* Supports OAuth 2.1 and header-based authentication for secure and flexible connections
* Compatible with both SSE and Streamable HTTP transport for efficient, real-time streaming communication
* Fully web-based, cross-platform client requiring no additional software installation

### systemprompt

[systemprompt](https://systemprompt.io) is a voice-controlled mobile app that manages your MCP servers. Securely leverage MCP agents from your pocket. Available on iOS and Android.

**Key features:**

* **Native Mobile Experience**: Access and manage your MCP servers anytime, anywhere on both Android and iOS devices
* **Advanced AI-Powered Voice Recognition**: Sophisticated voice recognition engine enhanced with cutting-edge AI and Natural Language Processing (NLP), specifically tuned to understand complex developer terminology and command structures
* **Unified Multi-MCP Server Management**: Effortlessly manage and interact with multiple Model Context Protocol (MCP) servers from a single, centralized mobile application

### Tambo

[Tambo](https://tambo.co) is a platform for building custom chat experiences in React, with integrated custom user interface components.

**Key features:**

* Hosted platform with React SDK for integrating chat or other LLM-based experiences into your own app.
* Support for selection of arbitrary React components in the chat experience, with state management and tool calling.
* Support for MCP servers, from Tambo's servers or directly from the browser.
* Supports OAuth 2.1 and custom header-based authentication.
* Support for MCP tools, with additional MCP features coming soon.

### Tencent CloudBase AI DevKit

[Tencent CloudBase AI DevKit](https://docs.cloudbase.net/ai/agent/mcp) is a tool for building AI agents in minutes, featuring zero-code tools, secure data integration, and extensible plugins via MCP.

**Key features:**

* Support for MCP tools
* Extend agents with MCP servers
* MCP servers hosting: serverless hosting and authentication support

### TheiaAI/TheiaIDE

[Theia AI](https://eclipsesource.com/blogs/2024/10/07/introducing-theia-ai/) is a framework for building AI-enhanced tools and IDEs. The [AI-powered Theia IDE](https://eclipsesource.com/blogs/2024/10/08/introducting-ai-theia-ide/) is an open and flexible development environment built on Theia AI.

**Key features:**

* **Tool Integration**: Theia AI enables AI agents, including those in the Theia IDE, to utilize MCP servers for seamless tool interaction.
* **Customizable Prompts**: The Theia IDE allows users to define and adapt prompts, dynamically integrating MCP servers for tailored workflows.
* **Custom agents**: The Theia IDE supports creating custom agents that leverage MCP capabilities, enabling users to design dedicated workflows on the fly.

Theia AI and Theia IDE's MCP integration provide users with flexibility, making them powerful platforms for exploring and adapting MCP.

**Learn more:**

* [Theia IDE and Theia AI MCP Announcement](https://eclipsesource.com/blogs/2024/12/19/theia-ide-and-theia-ai-support-mcp/)
* [Download the AI-powered Theia IDE](https://theia-ide.org/)

### Tome

[Tome](https://github.com/runebookai/tome) is an open source cross-platform desktop app designed for working with local LLMs and MCP servers. It is designed to be beginner friendly and abstract away the nitty gritty of configuration for people getting started with MCP.

**Key features:**

* MCP servers are managed by Tome so there is no need to install uv or npm or configure JSON
* Users can quickly add or remove MCP servers via UI
* Any tool-supported local model on Ollama is compatible

### TypingMind App

[TypingMind](https://www.typingmind.com) is an advanced frontend for LLMs with MCP support. TypingMind supports all popular LLM providers like OpenAI, Gemini, Claude, and users can use with their own API keys.

**Key features:**

* **MCP Tool Integration**: Once MCP is configured, MCP tools will show up as plugins that can be enabled/disabled easily via the main app interface.
* **Assign MCP Tools to Agents**: TypingMind allows users to create AI agents that have a set of MCP servers assigned.
* **Remote MCP servers**: Allows users to customize where to run the MCP servers via its MCP Connector configuration, allowing the use of MCP tools across multiple devices (laptop, mobile devices, etc.) or control MCP servers from a remote private server.

**Learn more:**

* [TypingMind MCP Document](https://www.typingmind.com/mcp)
* [Download TypingMind (PWA)](https://www.typingmind.com/)

### VS Code GitHub Copilot

[VS Code](https://code.visualstudio.com/) integrates MCP with GitHub Copilot through [agent mode](https://code.visualstudio.com/docs/copilot/chat/chat-agent-mode), allowing direct interaction with MCP-provided tools within your agentic coding workflow. Configure servers in Claude Desktop, workspace or user settings, with guided MCP installation and secure handling of keys in input variables to avoid leaking hard-coded keys.

**Key features:**

* Support for stdio and server-sent events (SSE) transport
* Per-session selection of tools per agent session for optimal performance
* Easy server debugging with restart commands and output logging
* Tool calls with editable inputs and always-allow toggle
* Integration with existing VS Code extension system to register MCP servers from extensions

### Warp

[Warp](https://www.warp.dev/) is the intelligent terminal with AI and your dev team's knowledge built-in. With natural language capabilities integrated directly into an agentic command line, Warp enables developers to code, automate, and collaborate more efficiently -- all within a terminal that features a modern UX.

**Key features:**

* **Agent Mode with MCP support**: invoke tools and access data from MCP servers using natural language prompts
* **Flexible server management**: add and manage CLI or SSE-based MCP servers via Warp's built-in UI
* **Live tool/resource discovery**: view tools and resources from each running MCP server
* **Configurable startup**: set MCP servers to start automatically with Warp or launch them manually as needed

### WhatsMCP

[WhatsMCP](https://wassist.app/mcp/) is an MCP client for WhatsApp. WhatsMCP lets you interact with your AI stack from the comfort of a WhatsApp chat.

**Key features:**

* Supports MCP tools
* SSE transport, full OAuth2 support
* Chat flow management for WhatsApp messages
* One click setup for connecting to your MCP servers
* In chat management of MCP servers
* Oauth flow natively supported in WhatsApp

### Windsurf Editor

[Windsurf Editor](https://codeium.com/windsurf) is an agentic IDE that combines AI assistance with developer workflows. It features an innovative AI Flow system that enables both collaborative and independent AI interactions while maintaining developer control.

**Key features:**

* Revolutionary AI Flow paradigm for human-AI collaboration
* Intelligent code generation and understanding
* Rich development tools with multi-model support

### Witsy

[Witsy](https://github.com/nbonamy/witsy) is an AI desktop assistant, supporting Anthropic models and MCP servers as LLM tools.

**Key features:**

* Multiple MCP servers support
* Tool integration for executing commands and scripts
* Local server connections for enhanced privacy and security
* Easy-install from Smithery.ai
* Open-source, available for macOS, Windows and Linux

### Zed

[Zed](https://zed.dev/docs/assistant/model-context-protocol) is a high-performance code editor with built-in MCP support, focusing on prompt templates and tool integration.

**Key features:**

* Prompt templates surface as slash commands in the editor
* Tool integration for enhanced coding workflows
* Tight integration with editor features and workspace context
* Does not support MCP resources

### Zencoder

[Zencoder](https://zecoder.ai) is a coding agent that's available as an extension for VS Code and JetBrains family of IDEs, meeting developers where they already work. It comes with RepoGrokking (deep contextual codebase understanding), agentic pipeline, and the ability to create and share custom agents.

**Key features:**

* RepoGrokking - deep contextual understanding of codebases
* Agentic pipeline - runs, tests, and executes code before outputting it
* Zen Agents platform - ability to build and create custom agents and share with the team
* Integrated MCP tool library with one-click installations
* Specialized agents for Unit and E2E Testing

**Learn more:**

* [Zencoder Documentation](https://docs.zencoder.ai)

## Adding MCP support to your application

If you've added MCP support to your application, we encourage you to submit a pull request to add it to this list. MCP integration can provide your users with powerful contextual AI capabilities and make your application part of the growing MCP ecosystem.

Benefits of adding MCP support:

* Enable users to bring their own context and tools
* Join a growing ecosystem of interoperable AI applications
* Provide users with flexible integration options
* Support local-first AI workflows

To get started with implementing MCP in your application, check out our [Python](https://github.com/modelcontextprotocol/python-sdk) or [TypeScript SDK Documentation](https://github.com/modelcontextprotocol/typescript-sdk)

## Updates and corrections

This list is maintained by the community. If you notice any inaccuracies or would like to update information about MCP support in your application, please submit a pull request or [open an issue in our documentation repository](https://github.com/modelcontextprotocol/modelcontextprotocol/issues).


# Contributor Communication
Source: https://modelcontextprotocol.io/community/communication

Communication strategy and framework for the Model Context Protocol community

This document explains how to communicate and collaborate within the Model Context Protocol (MCP) project.

## Communication Channels

In short:

* **[Discord][discord-join]**: For real-time or ad-hoc discussions.
* **[GitHub Discussions](https://github.com/modelcontextprotocol/modelcontextprotocol/discussions)**: For structured, longer-form discussions.
* **[GitHub Issues](https://github.com/modelcontextprotocol/modelcontextprotocol/issues)**: For actionable tasks, bug reports, and feature requests.
* **For security-sensitive issues**: Follow the process in [SECURITY.md](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/SECURITY.md).

All communication is governed by our [Code of Conduct](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/CODE_OF_CONDUCT.md). We expect all participants to maintain respectful, professional, and inclusive interactions across all channels.

### Discord

For real-time contributor discussion and collaboration. The server is designed around **MCP contributors** and is not intended
to be a place for general MCP support.

The Discord server will have both public and private channels.

[Join the Discord server here][discord-join].

#### Public Channels (Default)

* **Purpose**: Open community engagement, collaborative development, and transparent project coordination.
* Primary use cases:
  * **Public SDK and tooling development**: All development, from ideation to release planning, happens in public channels (e.g., `#typescript-sdk-dev`, `#inspector-dev`).
  * **[Working and Interest Group](/community/working-interest-groups) discussions**
  * **Community onboarding** and contribution guidance.
  * **Community feedback** and collaborative brainstorming.
  * Public **office hours** and **maintainer availability**.
* Avoid:
  * MCP user support: participants are expected to read official documentation and start new GitHub Discussions for questions or support.
  * Service or product marketing: interactions on this Discord are expected to be vendor-neutral and not used for brand-building or sales. Mentions of brands or products are discouraged outside of being used as examples or responses to conversations that start off focused on the specification.

#### Private channels (Exceptions)

* **Purpose**: Confidential coordination and sensitive matters that cannot be discussed publicly. Access will be restricted to designated maintainers.
* **Strict criteria for private use**:
  * **Security incidents** (CVEs, protocol vulnerabilities).
  * **People matters** (maintainer-related discussions, code of conduct policies).
  * Select channels will be configured to be **read-only**. This can be good for example for maintainer decision making.
  * Coordination requiring **immediate** or otherwise **focused response** with a limited audience.
* **Transparency**:
  * **All technical and governance decisions** affecting the community **must be documented** in GitHub Discussions and/or Issues, and will be labeled with `notes`.
  * **Some matters related to individual contributors** may remain private when appropriate (e.g., personal circumstances, disciplinary actions, or other sensitive individual matters).
  * Private channels are to be used as **temporary "incident rooms,"** not for routine development.

Any significant discussion on Discord that leads to a potential decision or proposal must be moved to a GitHub Discussion or GitHub Issue to create a persistent, searchable record. Proposals will then be promoted to full-fledged PRs with associated work items (GitHub Issues) as needed.

### GitHub Discussions

For structured, long-form discussion and debate on project direction, features, improvements, and community topics.

When to use:

* Project roadmap planning and milestone discussions
* Announcements and release communications
* Community polls and consensus-building processes
* Feature requests with context and rationale
  * If a particular repository does not have GitHub Discussions enabled, feel free to open a GitHub Issue instead.

### GitHub Issues

For bug reports, feature tracking, and actionable development tasks.

When to use:

* Submit SEP proposals (following the [SEP guidelines](./sep-guidelines))
* Bug reports with reproducible steps
* Documentation improvements with specific scope
* CI/CD problems and infrastructure issues
* Release tasks and milestone tracking

### Security Issues

**Do not post security issues publicly.** Instead:

1. Use the private security reporting process. For protocol-level security issues, follow the process in [SECURITY.md in the modelcontextprotocol GitHub repository](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/SECURITY.md).
2. Contact lead and/or [core maintainers](./governance#current-core-maintainers) directly.
3. Follow responsible disclosure guidelines.

## Decision Records

All MCP decisions are documented and captured in public channels.

* **Technical decisions**: [GitHub Issues](https://github.com/modelcontextprotocol/modelcontextprotocol/issues) and SEPs.
* **Specification changes**: [On the Model Context Protocol website](https://modelcontextprotocol.io/specification/draft/changelog).
* **Process changes**: [Community documentation](https://modelcontextprotocol.io/community/governance).
* **Governance decisions and updates**: [GitHub Issues](https://github.com/modelcontextprotocol/modelcontextprotocol/issues) and SEPs.

When documenting decisions, we will retain as much context as possible:

* Decision makers
* Background context and motivation
* Options that were considered
* Rationale for the chosen approach
* Implementation steps

[discord-join]: https://discord.gg/6CSzBmMkjX


# Governance and Stewardship
Source: https://modelcontextprotocol.io/community/governance

Learn about the Model Context Protocol's governance structure and how to participate in the community

The Model Context Protocol (MCP) follows a formal governance model to ensure transparent decision-making and community participation. This document outlines how the project is organized and how decisions are made.

## Technical Governance

The MCP project adopts a hierarchical structure, similar to Python, PyTorch and other open source projects:

* A community of **contributors** who file issues, make pull requests, and contribute to the project.
* A small set of **maintainers** drive components within the MCP project, such as SDKs, documentation, and others.
* Contributors and maintainers are overseen by **core maintainers**, who drive the overall project direction.
* The core maintainers have two **lead core maintainers** who are the catch-all decision makers.
* Maintainers, core maintainers, and lead core maintainers form the **MCP steering group**.

All maintainers are expected to have a strong bias towards MCP's design philosophy. Membership in the technical governance process is for individuals, not companies. That is, there are no seats reserved for specific companies, and membership is associated with the person rather than the company employing that person. This ensures that maintainers act in the best interests of the protocol itself and the open source community.

### Channels

Technical Governance is facilitated through a shared [Discord server](/community/communication#discord) of all **maintainers, core maintainers** and **lead maintainers**. Each maintainer group can choose additional communication channels, but all decisions and their supporting discussions must be recorded and made transparently available on the Discord server.

### Maintainers

Maintainers are responsible for [Working or Interest Groups](/community/working-interest-groups) within the MCP project. These generally are independent repositories such as language-specific SDKs, but can also extend to subdirectories of a repository, such as the MCP documentation. Maintainers may adopt their own rules and procedures for making decisions. Maintainers are expected to make decisions for their respective projects independently, but can defer or escalate to the core maintainers when needed.

Maintainers are responsible for the:

* Thoughtful and productive engagement with community contributors,
* Maintaining and improving their respective area of the MCP project,
* Supporting documentation, roadmaps and other adjacent parts of the MCP project,
* Present ideas from community to core.

Maintainers are encouraged to propose additional maintainers when needed. Maintainers can only be appointed and removed by core maintainers or lead core maintainers at any time and without reason.

Maintainers have write and/or admin access to their respective repositories.

### Core Maintainers

The core maintainers are expected to have a deep understanding of the Model Context Protocol and its specification. Their responsibilities include:

* Designing, reviewing and steering the evolution of the MCP specification, as well as all other parts of the MCP project, such as documentation,
* Articulating a cohesive long-term vision for the project,
* Mediating and resolving contentious issues with fairness and transparency, seeking consensus where possible while making decisive choices when necessary,
* Appoint or remove maintainers,
* Stewardship of the MCP project in the best interest of MCP.

The core maintainers as a group have the power to veto any decisions made by maintainers by majority vote. The core maintainers have power to resolve disputes as they see fit. The core maintainers should publicly articulate their decision-making. The core group is responsible for adopting their own procedures for making decisions.

Core maintainers generally have write and admin access to all MCP repositories, but should use the same contribution (usually pull-requests) mechanism as outside contributors. Exceptions can be made based on security considerations.

### Lead Maintainers (BDFL)

MCP has two lead maintainers: Justin Spahr-Summers and David Soria Parra. Lead Maintainers can veto any decision by core maintainers or maintainers. This model is also commonly known as Benevolent Dictator for Life (BDFL) in the open source community. The Lead Maintainers should publicly articulate their decision-making and give clear reasoning for their decisions. Lead maintainers are part of the core maintainer group.

The Lead Maintainers are responsible for confirming or removing core maintainers.

Lead Maintainers are administrators on all infrastructure for the MCP project where possible. This includes but is not restricted to all communication channels, GitHub organizations and repositories.

### Decision Process

The core maintainer group meets every two weeks to discuss and vote on proposals, as well as discuss any topics needed. The shared Discord server can be used to discuss and vote on smaller proposals if needed.

The lead maintainer, core maintainer, and maintainer group should attempt to meet in person every three to six months.

## Processes

Core and lead maintainers are responsible for all aspects of Model Context Protocol, including documentation, issues, suggestions for content, and all other parts under the [MCP project](https://github.com/modelcontextprotocol). Maintainers are responsible for documentation, issues, and suggestions of content for their area of the MCP project, but are encouraged to partake in general maintenance of the MCP projects. Maintainers, core maintainers, and lead maintainers should use the same contribution process as external contributors, rather than making direct changes to repos. This provides insight into intent and opportunity for discussion.

### Working and Interest Groups

MCP collaboration and contributions are organized around two structures: [Working Groups and Interest Groups](/community/working-interest-groups).

Interest Groups are responsible for identifying and articulating problems that MCP should address, primarily by facilitating open discussions within the community. In contrast, Working Groups focus on developing concrete solutions by collaboratively producing deliverables, such as SEPs or community-owned implementations of the specification. While input from Interest Groups can help justify the formation of a Working Group, it is not a strict requirement. Similarly, contributions from either Interest Groups or Working Groups are encouraged, but not mandatory, when submitting SEPs or other community proposals.

We strongly encourage all contributors interested in working on a specific SEP to first collaborate within an Interest Group. This collaborative process helps ensure that the proposed SEP aligns with protocol needs and is the right direction for its adopters.

#### Governance Principles

All groups are self-governed while adhering to these core principles:

1. Clear contribution and decision-making processes
2. Open communication and transparent decisions

Both must:

* Document their contribution process
* Maintain transparent communication
* Make decisions publicly (groups must publish meeting notes and proposals)

Projects and working groups without specified processes default to:

* GitHub pull requests and issues for contributions
* A public channel in the official [MCP Contributor Discord](/community/communication#discord)

#### Maintenance Responsibilities

Components without dedicated maintainers (such as documentation) fall under core maintainer responsibility. These follow standard contribution guidelines through pull requests, with maintainers handling reviews and escalating to core maintainer review for any significant changes.

Core maintainers and maintainers are encouraged to improve any part of the MCP project, regardless of formal maintenance assignments.

### Specification Project

#### Specification Enhancement Proposal (SEP)

Proposed changes to the specification must come in the form of a written version, starting with a summary of the proposal, outlining the **problem** it tries to solve, propose **solution**, **alternatives**, **considerations, outcomes** and **risks**. The [SEP Guidelines](/community/sep-guidelines) outline information on the expected structure of SEPs. SEP's should be created as issues in the [specification repository](https://github.com/modelcontextprotocol/specification) and tagged with the labels `proposal, sep`.

All proposals must have a **sponsor** from the MCP steering group (maintainer, core maintainer or lead core maintainer). The sponsor is responsible for ensuring that the proposal is actively developed, meets the quality standard for proposals and is responsible for presenting and discussing it in meetings of core maintainers. Maintainer and Core Maintainer groups should review open proposals without sponsors in regular intervals. Proposals that do not find a sponsor within six months are automatically rejected.

Once proposals have a sponsor, they are assigned to the sponsor and are tagged `draft`.

## Communication

### Core Maintainer Meetings

The core maintainer group meets on a bi-weekly basis to discuss proposals and the project. Notes on proposals should be made public. The core maintainer group will strive to meet in person every 3-6 months.

### Public Chat

The MCP project maintains a [public Discord server](/community/communication#discord) with open chats for interest groups. The MCP project may have private channels for certain communications.

## Nominating, Confirming and Removing Maintainers

### The Principles

* Membership in module maintainer groups is given to **individuals** on merit basis after they demonstrated strong expertise of their area of work through contributions, reviews, and discussions and are aligned with the overall MCP direction.
* For membership in the **maintainer** group the individual has to demonstrate strong and continued alignment with the overall MCP principles.
* No term limits for module maintainers or core maintainers
* Light criteria of moving working-group or sub-project maintenance to 'emeritus' status if they don't actively participate over long periods of time. Each maintainer group may define the inactive period that's appropriate for their area.
* The membership is for an individual, not a company.

### Nomination and Removal

* Core Maintainers are responsible for adding and removing maintainers. They will take the consideration of existing maintainers into account.
* The lead maintainers are responsible for adding and removing core maintainers.

#### Nomination Process

If a Maintainer (or Core / Lead Maintainer) wishes to propose a nomination for the Core / Lead Maintainers’ consideration, they should follow the following process:

1. Collect evidence for the nomination. This will generally come in the form of a history of merged PRs on the repositories for which maintainership is being considered.
2. Discuss among maintainers of the relevant group(s) as to whether they would be supportive of approving the nomination.
3. DM a Community Moderator or Core Maintainer to create a private channel in Discord, in the format `nomination-{name}-{group}`. Add all core maintainers, lead maintainers, and co-maintainers on the relevant group.
4. Provide context for the individual under nomination. See below for suggestions on what to include here.
5. Create a Discord Poll and ask Core / Lead Maintainers to vote Yes / No on the nomination. Reaching consensus is encouraged though not required.
6. After Core / Lead Maintainers discuss and/or vote, if the nomination is favorable, relevant members with permissions to update GitHub an Discord roles will add the nominee to the appropriate groups. The nominator should announce the new maintainership in the relevant Discord channel.
7. The temporary Discord channel will be deleted a week later.

Suggestions for the kind of information to share with core maintainers when nominating someone:

* GitHub profile link, LinkedIn profile link, Discord username
* For what group(s) are you nominating the individual for maintainership
* Whether the group(s) agree that this person should be elevated to maintainership
* Description of their contributions to date (including links to most substantial contributions)
* Description of expected contributions moving forward (e.g. Are they eager to be a maintainer? Will they have capacity to do so?)
* Other context about the individual (e.g. current employer, motivations behind MCP involvement)
* Anything else you think may be relevant to consider for the nomination

## Current Core Maintainers

* Inna Harper
* Basil Hosmer
* Paul Carleton
* Nick Cooper
* Nick Aldridge
* Che Liu
* Den Delimarsky

## Current Maintainers and Working Groups

Refer to [the maintainer list](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/MAINTAINERS.md).


# SEP Guidelines
Source: https://modelcontextprotocol.io/community/sep-guidelines

Specification Enhancement Proposal (SEP) guidelines for proposing changes to the Model Context Protocol

## What is a SEP?

SEP stands for Specification Enhancement Proposal. A SEP is a design document providing information to the MCP community, or describing a new feature for the Model Context Protocol or its processes or environment. The SEP should provide a concise technical specification of the feature and a rationale for the feature.

We intend SEPs to be the primary mechanisms for proposing major new features, for collecting community input on an issue, and for documenting the design decisions that have gone into MCP. The SEP author is responsible for building consensus within the community and documenting dissenting opinions.

Because the SEPs are maintained as text files in a versioned repository (GitHub Issues), their revision history is the historical record of the feature proposal.

## What qualifies a SEP?

The goal is to reserve the SEP process for changes that are substantial enough to require broad community discussion, a formal design document, and a historical record of the decision-making process. A regular GitHub issue or pull request is often more appropriate for smaller, more direct changes.

Consider proposing a SEP if your change involves any of the following:

* **A New Feature or Protocol Change**: Any change that adds, modifies, or removes features in the Model Context Protocol. This includes:
  * Adding new API endpoints or methods.
  * Changing the syntax or semantics of existing data structures or messages.
  * Introducing a new standard for interoperability between different MCP-compatible tools.
  * Significant changes to how the specification itself is defined, presented, or validated.
* **A Breaking Change**: Any change that is not backwards-compatible.
* **A Change to Governance or Process**: Any proposal that alters the project's decision-making, contribution guidelines (like this document itself).
* **A Complex or Controversial Topic**: If a change is likely to have multiple valid solutions or generate significant debate, the SEP process provides the necessary framework to explore alternatives, document the rationale, and build community consensus before implementation begins.

## SEP Types

There are three kinds of SEP:

1. **Standards Track** SEP describes a new feature or implementation for the Model Context Protocol. It may also describe an interoperability standard that will be supported outside the core protocol specification.
2. **Informational** SEP describes a Model Context Protocol design issue, or provides general guidelines or information to the MCP community, but does not propose a new feature. Informational SEPs do not necessarily represent an MCP community consensus or recommendation.
3. **Process** SEP describes a process surrounding MCP, or proposes a change to (or an event in) a process. Process SEPs are like Standards Track SEPs but apply to areas other than the MCP protocol itself.

## Submitting a SEP

The SEP process begins with a new idea for the Model Context Protocol. It is highly recommended that a single SEP contain a single key proposal or new idea. Small enhancements or patches often don't need a SEP and can be injected into the MCP development workflow with a pull request to the MCP repo. The more focused the SEP, the more successful it tends to be.

Each SEP must have an **SEP author** -- someone who writes the SEP using the style and format described below, shepherds the discussions in the appropriate forums, and attempts to build community consensus around the idea. The SEP author should first attempt to ascertain whether the idea is SEP-able. Posting to the MCP community forums (Discord, GitHub Discussions) is the best way to go about this.

### SEP Workflow

SEPs should be submitted as a GitHub Issue in the [specification repository](https://github.com/modelcontextprotocol/modelcontextprotocol). The standard SEP workflow is:

1. You, the SEP author, create a [well-formatted](#sep-format) GitHub Issue with the `SEP` and `proposal` tags. The SEP number is the same as the GitHub Issue number, the two can be used interchangably.
2. Find a Core Maintainer or Maintainer to sponsor your proposal. Core Maintainers and Maintainers will regularly go over the list of open proposals to determine which proposals to sponsor. You can tag relevant maintainers from [the maintainer list](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/MAINTAINERS.md) in your proposal.
3. Once a sponsor is found, the GitHub Issue is assigned to the sponsor. The sponsor will add the `draft` tag, ensure the SEP number is in the title, and assign a milestone.
4. The sponsor will informally review the proposal and may request changes based on community feedback. When ready for formal review, the sponsor will add the `in-review` tag.
5. After the `in-review` tag is added, the SEP enters formal review by the Core Maintainers team. The SEP may be accepted, rejected, or returned for revision.
6. If the SEP has not found a sponsor within three months, Core Maintainers may close the SEP as `dormant`.

### SEP Format

Each SEP should have the following parts:

1. **Preamble** -- A short descriptive title, the names and contact info for each author, the current status.
2. **Abstract** -- A short (\~200 word) description of the technical issue being addressed.
3. **Motivation** -- The motivation should clearly explain why the existing protocol specification is inadequate to address the problem that the SEP solves. The motivation is critical for SEPs that want to change the Model Context Protocol. SEP submissions without sufficient motivation may be rejected outright.
4. **Specification** -- The technical specification should describe the syntax and semantics of any new protocol feature. The specification should be detailed enough to allow competing, interoperable implementations. A PR with the changes to the specification should be provided.
5. **Rationale** -- The rationale explains why particular design decisions were made. It should describe alternate designs that were considered and related work. The rationale should provide evidence of consensus within the community and discuss important objections or concerns raised during discussion.
6. **Backward Compatibility** -- All SEPs that introduce backward incompatibilities must include a section describing these incompatibilities and their severity. The SEP must explain how the author proposes to deal with these incompatibilities.
7. **Reference Implementation** -- The reference implementation must be completed before any SEP is given status "Final", but it need not be completed before the SEP is accepted. While there is merit to the approach of reaching consensus on the specification and rationale before writing code, the principle of "rough consensus and running code" is still useful when it comes to resolving many discussions of protocol details.
8. **Security Implications** -- If there are security concerns in relation to the SEP, those concerns should be explicitly written out to make sure reviewers of the SEP are aware of them.

### SEP States

SEPs can be one one of the following states

* `proposal`: SEP proposal without a sponsor.
* `draft`: SEP proposal with a sponsor.
* `in-review`: SEP proposal ready for review.
* `accepted`: SEP accepted by Core Maintainers, but still requires final wording and reference implementation.
* `rejected`: SEP rejected by Core Maintainers.
* `withdrawn`: SEP withdrawn.
* `final`: SEP finalized.
* `superseded`: SEP has been replaced by a newer SEP.
* `dormant`: SEP that has not found sponsors and was subsequently closed.

### SEP Review & Resolution

SEPs are reviewed by the MCP Core Maintainers team on a bi-weekly basis.

For a SEP to be accepted it must meet certain minimum criteria:

* A prototype implementation demonstrating the proposal
* Clear benefit to the MCP ecosystem
* Community support and consensus

Once a SEP has been accepted, the reference implementation must be completed. When the reference implementation is complete and incorporated into the main source code repository, the status will be changed to "Final".

A SEP can also be "Rejected" or "Withdrawn". A SEP that is "Withdrawn" may be re-submitted at a later date.

## Reporting SEP Bugs, or Submitting SEP Updates

How you report a bug, or submit a SEP update depends on several factors, such as the maturity of the SEP, the preferences of the SEP author, and the nature of your comments. For SEPs not yet reaching `final` state, it's probably best to send your comments and changes directly to the SEP author. Once SEP is finalized, you may want to submit corrections as a GitHub comment on the issue or pull request to the reference implementation.

## Transferring SEP Ownership

It occasionally becomes necessary to transfer ownership of SEPs to a new SEP author. In general, we'd like to retain the original author as a co-author of the transferred SEP, but that's really up to the original author. A good reason to transfer ownership is because the original author no longer has the time or interest in updating it or following through with the SEP process, or has fallen off the face of the 'net (i.e. is unreachable or not responding to email). A bad reason to transfer ownership is because you don't agree with the direction of the SEP. We try to build consensus around a SEP, but if that's not possible, you can always submit a competing SEP.

## Copyright

This document is placed in the public domain or under the CC0-1.0-Universal license, whichever is more permissive.


# Working and Interest Groups
Source: https://modelcontextprotocol.io/community/working-interest-groups

Learn about the two forms of collaborative groups within the Model Context Protocol's governance structure - Working Groups and Interest Groups.

Within the MCP contributor community we maintain two types of collaboration formats - **Interest** and **Working** groups.

**Interest Groups** are responsible for identifying and articulating problems that MCP should address, primarily by facilitating open discussions within the community. In contrast, **Working Groups** focus on developing concrete solutions by collaboratively producing deliverables, such as SEPs or community-owned implementations of the specification.

While input from Interest Groups can help justify the formation of a Working Group, it is not a strict requirement. Similarly, contributions from either Interest Groups or Working Groups are encouraged, but not mandatory, when submitting SEPs or other community proposals.

We strongly encourage all contributors interested in working on a specific SEP to first collaborate within an Interest Group. This collaborative process helps ensure that the proposed SEP aligns with community needs and is the right direction for the protocol.

Long-term projects in the MCP ecosystem, such as SDKs, Inspector, or Registry are maintained by dedicated Working Groups.

## Purpose

These groups exist to:

* **Facilitate high-signal spaces for focused discussions** - contributors who opt into notifications, expertise sharing, and regular meetings can engage with topics that are highly relevant to them, enabling meaningful contributions and opportunities to learn from others.
* **Establish clear expectations and leadership roles** - guide collaborative efforts and ensure steady progress toward concrete deliverables that advance MCP evolution and adoption.

## Mechanisms

### Interest Groups (IGs)

**Goal:** Facilitate discussion and knowledge-sharing among MCP contributors who share interests in a specific MCP sub-topic or context. The primary focus is on identifying and gathering problems that may be worth addressing through SEPs or other community artifacts, while encouraging open exploration of protocol issues and opportunities.

**Expectations**:

* Regular conversations in the Interest Group Discord channel
* **AND/OR** a recurring live meeting regularly attended by Interest Group members

**Examples**:

* Security in MCP
* Auth in MCP
* Using MCP in enterprise settings
* Tooling and practices surrounding hosting MCP servers
* Tooling and practices surrounding implementing MCP clients

**Lifecycle**:

* Creation begins by filling out a template in the #wg-ig-group-creation [Discord](/community/communication#discord) channel
* A community moderator will review and call for a vote in the (private) #community-moderators Discord channel. Majority positive vote by members over a 72h period approves creation of the group.
  * The creation of the group can be reversed at any time (e.g., after new information surfaces). Core and lead maintainers can veto.
* Facilitator(s) and Maintainer(s) responsible for organizing IG into meeting expectations
  * Facilitator is an informal role responsible for shepherding or speaking for a group
  * Maintainer is an official representative from the MCP steering group. A maintainer is not required for every group, but can help advocate for specific changes or initiatives.
* IG is retired only when community moderators or Core or Lead Maintainers determine it's no longer active and/or needed
  * Successful IGs do not have a time limit or expiration date - as long as they are active and maintained, they will remain available

**Creation Template**:

* Facilitator(s)
* Maintainer(s) (optional)
* IGs with potentially similar goals/discussions
* How this IG differentiates itself from the related IGs
* First topic you to discuss within the IG

Participation in an Interest Group (IG) is not required to start a Working Group (WG) or to create a SEP. However, building consensus within IGs can be valuable when justifying the formation of a WG. Likewise, referencing support from IGs or WGs can strengthen a SEP and its chances of success.

### Working Groups (WG)

**Goal:** Facilitate collaboration within the MCP community on a SEP, a themed series of SEPs, or an otherwise officially endorsed project.

**Expectations**:

* Meaningful progress towards at least one SEP or spec-related implementation **OR** hold maintenance responsibilities for a project (e.g., Inspector, Registry, SDKs)
* Facilitators are responsible for keeping track of progress and communicating status when appropriate

**Examples**:

* Registry
* Inspector
* Tool Filtering
* Server Identity

**Lifecycle**:

* Creation begins by filling out a template in #wg-ig-group-creation Discord channel
* A community moderator will review and call for a vote in the (private) #community-moderators Discord channel. Majority positive vote by members over a 72h period approves creation of the group.
  * The creation of the group can be reversed at any time (e.g., after new information surfaces). Core and lead maintainers can veto.
* Facilitator(s) and Maintainer(s) responsible for organizing WG into meeting expectations
  * Facilitator is an informal role responsible for shepherding or speaking for a group
  * Maintainer is an official representative from the MCP steering group. A maintainer is not required for every group, but can help advocate for specific changes or initiatives
* WG is retired when either:
  * Community moderators or Core and Lead Maintainers decide it is no longer active and/or needed
  * The WG no longer has an active Issue/PR for a month or more, or has completed all Issues/PRs it intended to pursue.

**Creation Template**:

* Facilitator(s)
* Maintainer(s) (optional)
* Explanation of interest/use cases, ideally originating from an IG discussion; however that is not a requirement
* First Issue/PR/SEP that the WG will work on

## WG/IG Facilitators

A **Facilitator** role in a WG or IG does *not* result in a [maintainership role](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/MAINTAINERS.md) across the MCP organization. It is an informal role into which anyone can self-nominate.

A Facilitator is responsible for helping shepherd discussions and collaboration within an Interest or Working Group.

Lead and Core Maintainers reserve the right to modify the list of Facilitators and Maintainers for any WG/IG at any time.

## FAQ

### How do I get involved contributing to MCP?

These IG and WG abstractions help provide an elegant on-ramp:

1. [Join the Discord](/community/communication#discord) and follow conversations in IGs relevant to you. Attend live calls. Participate.
2. Offer to facilitate calls. Contribute your use cases in SEP proposals and other work.
3. When you're comfortable contributing to deliverables, jump in to contribute to WG work.
4. Active and valuable contributors will be nominated by WG maintainers as new maintainers.

### Where can I find a list of all current WGs and IGs?

On the [MCP Contributor Discord](/community/communication#discord) there is a section of channels for each Working and Interest Group.


# Roadmap
Source: https://modelcontextprotocol.io/development/roadmap

Our plans for evolving Model Context Protocol

<Info>Last updated: **2025-07-22**</Info>

The Model Context Protocol is rapidly evolving. This page outlines our current thinking on key priorities and direction for approximately **the next six months**, though these may change significantly as the project develops. To see what's changed recently, check out the **[specification changelog](/specification/2025-06-18/changelog/)**.

<Note>
  The ideas presented here are not commitments—we may solve these challenges differently than described, or some may not materialize at all. This is also not an *exhaustive* list; we may incorporate work that isn't mentioned here.
</Note>

We value community participation! Each section links to relevant discussions where you can learn more and contribute your thoughts.

For a technical view of our standardization process, visit the [Standards Track](https://github.com/orgs/modelcontextprotocol/projects/2/views/2) on GitHub, which tracks how proposals progress toward inclusion in the official [MCP specification](https://spec.modelcontextprotocol.io).

## Agents

As MCP increasingly becomes part of agentic workflows, we're focusing on key improvements:

* **Asynchronous Operations**: supporting long-running operations that may take extended periods, with resilient handling of disconnections and reconnections

## Authentication and Security

We're evolving our authorization and security resources to improve user safety and provide a better developer experience:

* **Guides and Best Practices**: documenting specifics about deploying MCP securely in the form of guides and best practices to help developers avoid common pitfalls.
* **Alternatives to Dynamic Client Registration (DCR)**: exploring alternatives to DCR, attempting to address operational challenges while preserving a smooth user experience.
* **Fine-grained Authorization**: developing mechanisms and guidelines for primitive authorization for sensitive actions
* **Enterprise Managed Authorization**: adding the capability for enterprises to simplify MCP server authorization with the help of Single Sign-On (SSO)
* **Secure Authorization Elicitation**: enable developers to integrate secure authorization flows for downstream APIs outside the main MCP server authorization

## Validation

To foster a robust developer ecosystem, we plan to invest in:

* **Reference Client Implementations**: demonstrating protocol features with high-quality AI applications
* **Reference Server Implementation**: showcasing authentication patterns and remote deployment best practices
* **Compliance Test Suites**: automated verification that clients, servers, and SDKs properly implement the specification

These tools will help developers confidently implement MCP while ensuring consistent behavior across the ecosystem.

## Registry

For MCP to reach its full potential, we need streamlined ways to distribute and discover MCP servers.

We plan to develop an [**MCP Registry**](https://github.com/orgs/modelcontextprotocol/discussions/159) that will enable centralized server discovery and metadata. This registry will primarily function as an API layer that third-party marketplaces and discovery services can build upon.

## Multimodality

Supporting the full spectrum of AI capabilities in MCP, including:

* **Additional Modalities**: video and other media types
* **[Streaming](https://github.com/modelcontextprotocol/specification/issues/117)**: multipart, chunked messages, and bidirectional communication for interactive experiences

## Get Involved

We welcome your contributions to MCP's future! Join our [GitHub Discussions](https://github.com/orgs/modelcontextprotocol/discussions) to share ideas, provide feedback, or participate in the development process.


# Build an MCP client
Source: https://modelcontextprotocol.io/docs/develop/build-client

Get started building your own client that can integrate with all MCP servers.

In this tutorial, you'll learn how to build an LLM-powered chatbot client that connects to MCP servers.

Before you begin, it helps to have gone through our [Build an MCP Server](/docs/develop/build-server) tutorial so you can understand how clients and servers communicate.

<Tabs>
  <Tab title="Python">
    [You can find the complete code for this tutorial here.](https://github.com/modelcontextprotocol/quickstart-resources/tree/main/mcp-client-python)

    ## System Requirements

    Before starting, ensure your system meets these requirements:

    * Mac or Windows computer
    * Latest Python version installed
    * Latest version of `uv` installed

    ## Setting Up Your Environment

    First, create a new Python project with `uv`:

    <CodeGroup>
      ```bash macOS/Linux
      # Create project directory
      uv init mcp-client
      cd mcp-client

      # Create virtual environment
      uv venv

      # Activate virtual environment
      source .venv/bin/activate

      # Install required packages
      uv add mcp anthropic python-dotenv

      # Remove boilerplate files
      rm main.py

      # Create our main file
      touch client.py
      ```

      ```powershell Windows
      # Create project directory
      uv init mcp-client
      cd mcp-client

      # Create virtual environment
      uv venv

      # Activate virtual environment
      .venv\Scripts\activate

      # Install required packages
      uv add mcp anthropic python-dotenv

      # Remove boilerplate files
      del main.py

      # Create our main file
      new-item client.py
      ```
    </CodeGroup>

    ## Setting Up Your API Key

    You'll need an Anthropic API key from the [Anthropic Console](https://console.anthropic.com/settings/keys).

    Create a `.env` file to store it:

    ```bash
    echo "ANTHROPIC_API_KEY=<your key here>" > .env
    ```

    Add `.env` to your `.gitignore`:

    ```bash
    echo ".env" >> .gitignore
    ```

    <Warning>
      Make sure you keep your `ANTHROPIC_API_KEY` secure!
    </Warning>

    ## Creating the Client

    ### Basic Client Structure

    First, let's set up our imports and create the basic client class:

    ```python
    import asyncio
    from typing import Optional
    from contextlib import AsyncExitStack

    from mcp import ClientSession, StdioServerParameters
    from mcp.client.stdio import stdio_client

    from anthropic import Anthropic
    from dotenv import load_dotenv

    load_dotenv()  # load environment variables from .env

    class MCPClient:
        def __init__(self):
            # Initialize session and client objects
            self.session: Optional[ClientSession] = None
            self.exit_stack = AsyncExitStack()
            self.anthropic = Anthropic()
        # methods will go here
    ```

    ### Server Connection Management

    Next, we'll implement the method to connect to an MCP server:

    ```python
    async def connect_to_server(self, server_script_path: str):
        """Connect to an MCP server

        Args:
            server_script_path: Path to the server script (.py or .js)
        """
        is_python = server_script_path.endswith('.py')
        is_js = server_script_path.endswith('.js')
        if not (is_python or is_js):
            raise ValueError("Server script must be a .py or .js file")

        command = "python" if is_python else "node"
        server_params = StdioServerParameters(
            command=command,
            args=[server_script_path],
            env=None
        )

        stdio_transport = await self.exit_stack.enter_async_context(stdio_client(server_params))
        self.stdio, self.write = stdio_transport
        self.session = await self.exit_stack.enter_async_context(ClientSession(self.stdio, self.write))

        await self.session.initialize()

        # List available tools
        response = await self.session.list_tools()
        tools = response.tools
        print("\nConnected to server with tools:", [tool.name for tool in tools])
    ```

    ### Query Processing Logic

    Now let's add the core functionality for processing queries and handling tool calls:

    ```python
    async def process_query(self, query: str) -> str:
        """Process a query using Claude and available tools"""
        messages = [
            {
                "role": "user",
                "content": query
            }
        ]

        response = await self.session.list_tools()
        available_tools = [{
            "name": tool.name,
            "description": tool.description,
            "input_schema": tool.inputSchema
        } for tool in response.tools]

        # Initial Claude API call
        response = self.anthropic.messages.create(
            model="claude-3-5-sonnet-20241022",
            max_tokens=1000,
            messages=messages,
            tools=available_tools
        )

        # Process response and handle tool calls
        final_text = []

        assistant_message_content = []
        for content in response.content:
            if content.type == 'text':
                final_text.append(content.text)
                assistant_message_content.append(content)
            elif content.type == 'tool_use':
                tool_name = content.name
                tool_args = content.input

                # Execute tool call
                result = await self.session.call_tool(tool_name, tool_args)
                final_text.append(f"[Calling tool {tool_name} with args {tool_args}]")

                assistant_message_content.append(content)
                messages.append({
                    "role": "assistant",
                    "content": assistant_message_content
                })
                messages.append({
                    "role": "user",
                    "content": [
                        {
                            "type": "tool_result",
                            "tool_use_id": content.id,
                            "content": result.content
                        }
                    ]
                })

                # Get next response from Claude
                response = self.anthropic.messages.create(
                    model="claude-3-5-sonnet-20241022",
                    max_tokens=1000,
                    messages=messages,
                    tools=available_tools
                )

                final_text.append(response.content[0].text)

        return "\n".join(final_text)
    ```

    ### Interactive Chat Interface

    Now we'll add the chat loop and cleanup functionality:

    ```python
    async def chat_loop(self):
        """Run an interactive chat loop"""
        print("\nMCP Client Started!")
        print("Type your queries or 'quit' to exit.")

        while True:
            try:
                query = input("\nQuery: ").strip()

                if query.lower() == 'quit':
                    break

                response = await self.process_query(query)
                print("\n" + response)

            except Exception as e:
                print(f"\nError: {str(e)}")

    async def cleanup(self):
        """Clean up resources"""
        await self.exit_stack.aclose()
    ```

    ### Main Entry Point

    Finally, we'll add the main execution logic:

    ```python
    async def main():
        if len(sys.argv) < 2:
            print("Usage: python client.py <path_to_server_script>")
            sys.exit(1)

        client = MCPClient()
        try:
            await client.connect_to_server(sys.argv[1])
            await client.chat_loop()
        finally:
            await client.cleanup()

    if __name__ == "__main__":
        import sys
        asyncio.run(main())
    ```

    You can find the complete `client.py` file [here.](https://gist.github.com/zckly/f3f28ea731e096e53b39b47bf0a2d4b1)

    ## Key Components Explained

    ### 1. Client Initialization

    * The `MCPClient` class initializes with session management and API clients
    * Uses `AsyncExitStack` for proper resource management
    * Configures the Anthropic client for Claude interactions

    ### 2. Server Connection

    * Supports both Python and Node.js servers
    * Validates server script type
    * Sets up proper communication channels
    * Initializes the session and lists available tools

    ### 3. Query Processing

    * Maintains conversation context
    * Handles Claude's responses and tool calls
    * Manages the message flow between Claude and tools
    * Combines results into a coherent response

    ### 4. Interactive Interface

    * Provides a simple command-line interface
    * Handles user input and displays responses
    * Includes basic error handling
    * Allows graceful exit

    ### 5. Resource Management

    * Proper cleanup of resources
    * Error handling for connection issues
    * Graceful shutdown procedures

    ## Common Customization Points

    1. **Tool Handling**
       * Modify `process_query()` to handle specific tool types
       * Add custom error handling for tool calls
       * Implement tool-specific response formatting

    2. **Response Processing**
       * Customize how tool results are formatted
       * Add response filtering or transformation
       * Implement custom logging

    3. **User Interface**
       * Add a GUI or web interface
       * Implement rich console output
       * Add command history or auto-completion

    ## Running the Client

    To run your client with any MCP server:

    ```bash
    uv run client.py path/to/server.py # python server
    uv run client.py path/to/build/index.js # node server
    ```

    <Note>
      If you're continuing the weather tutorial from the server quickstart, your command might look something like this: `python client.py .../quickstart-resources/weather-server-python/weather.py`
    </Note>

    The client will:

    1. Connect to the specified server
    2. List available tools
    3. Start an interactive chat session where you can:
       * Enter queries
       * See tool executions
       * Get responses from Claude

    Here's an example of what it should look like if connected to the weather server from the server quickstart:

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/client-claude-cli-python.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=686d6e0ae7c54f807827db111eaed7d4" data-og-width="1932" width="1932" data-og-height="1739" height="1739" data-path="images/client-claude-cli-python.png" data-optimize="true" data-opv="2" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/client-claude-cli-python.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=48ff45c4ca51501589d9f20f060daa56 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/client-claude-cli-python.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=b35ca5d8a67c2f08efec9c6519efcfe2 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/client-claude-cli-python.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=51b8f5c7fa48db6ccd30aa9988a8c917 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/client-claude-cli-python.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=9e1b01bc4c324a7e5100674f63f36b13 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/client-claude-cli-python.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=e3e961bd5b5506fed6c860f70df9bf9d 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/client-claude-cli-python.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=da01c2527db68cb0c99d29d20751a868 2500w" />
    </Frame>

    ## How It Works

    When you submit a query:

    1. The client gets the list of available tools from the server
    2. Your query is sent to Claude along with tool descriptions
    3. Claude decides which tools (if any) to use
    4. The client executes any requested tool calls through the server
    5. Results are sent back to Claude
    6. Claude provides a natural language response
    7. The response is displayed to you

    ## Best practices

    1. **Error Handling**
       * Always wrap tool calls in try-catch blocks
       * Provide meaningful error messages
       * Gracefully handle connection issues

    2. **Resource Management**
       * Use `AsyncExitStack` for proper cleanup
       * Close connections when done
       * Handle server disconnections

    3. **Security**
       * Store API keys securely in `.env`
       * Validate server responses
       * Be cautious with tool permissions

    ## Troubleshooting

    ### Server Path Issues

    * Double-check the path to your server script is correct
    * Use the absolute path if the relative path isn't working
    * For Windows users, make sure to use forward slashes (/) or escaped backslashes (\\) in the path
    * Verify the server file has the correct extension (.py for Python or .js for Node.js)

    Example of correct path usage:

    ```bash
    # Relative path
    uv run client.py ./server/weather.py

    # Absolute path
    uv run client.py /Users/username/projects/mcp-server/weather.py

    # Windows path (either format works)
    uv run client.py C:/projects/mcp-server/weather.py
    uv run client.py C:\\projects\\mcp-server\\weather.py
    ```

    ### Response Timing

    * The first response might take up to 30 seconds to return
    * This is normal and happens while:
      * The server initializes
      * Claude processes the query
      * Tools are being executed
    * Subsequent responses are typically faster
    * Don't interrupt the process during this initial waiting period

    ### Common Error Messages

    If you see:

    * `FileNotFoundError`: Check your server path
    * `Connection refused`: Ensure the server is running and the path is correct
    * `Tool execution failed`: Verify the tool's required environment variables are set
    * `Timeout error`: Consider increasing the timeout in your client configuration
  </Tab>

  <Tab title="Node">
    [You can find the complete code for this tutorial here.](https://github.com/modelcontextprotocol/quickstart-resources/tree/main/mcp-client-typescript)

    ## System Requirements

    Before starting, ensure your system meets these requirements:

    * Mac or Windows computer
    * Node.js 17 or higher installed
    * Latest version of `npm` installed
    * Anthropic API key (Claude)

    ## Setting Up Your Environment

    First, let's create and set up our project:

    <CodeGroup>
      ```bash macOS/Linux
      # Create project directory
      mkdir mcp-client-typescript
      cd mcp-client-typescript

      # Initialize npm project
      npm init -y

      # Install dependencies
      npm install @anthropic-ai/sdk @modelcontextprotocol/sdk dotenv

      # Install dev dependencies
      npm install -D @types/node typescript

      # Create source file
      touch index.ts
      ```

      ```powershell Windows
      # Create project directory
      md mcp-client-typescript
      cd mcp-client-typescript

      # Initialize npm project
      npm init -y

      # Install dependencies
      npm install @anthropic-ai/sdk @modelcontextprotocol/sdk dotenv

      # Install dev dependencies
      npm install -D @types/node typescript

      # Create source file
      new-item index.ts
      ```
    </CodeGroup>

    Update your `package.json` to set `type: "module"` and a build script:

    ```json package.json
    {
      "type": "module",
      "scripts": {
        "build": "tsc && chmod 755 build/index.js"
      }
    }
    ```

    Create a `tsconfig.json` in the root of your project:

    ```json tsconfig.json
    {
      "compilerOptions": {
        "target": "ES2022",
        "module": "Node16",
        "moduleResolution": "Node16",
        "outDir": "./build",
        "rootDir": "./",
        "strict": true,
        "esModuleInterop": true,
        "skipLibCheck": true,
        "forceConsistentCasingInFileNames": true
      },
      "include": ["index.ts"],
      "exclude": ["node_modules"]
    }
    ```

    ## Setting Up Your API Key

    You'll need an Anthropic API key from the [Anthropic Console](https://console.anthropic.com/settings/keys).

    Create a `.env` file to store it:

    ```bash
    echo "ANTHROPIC_API_KEY=<your key here>" > .env
    ```

    Add `.env` to your `.gitignore`:

    ```bash
    echo ".env" >> .gitignore
    ```

    <Warning>
      Make sure you keep your `ANTHROPIC_API_KEY` secure!
    </Warning>

    ## Creating the Client

    ### Basic Client Structure

    First, let's set up our imports and create the basic client class in `index.ts`:

    ```typescript
    import { Anthropic } from "@anthropic-ai/sdk";
    import {
      MessageParam,
      Tool,
    } from "@anthropic-ai/sdk/resources/messages/messages.mjs";
    import { Client } from "@modelcontextprotocol/sdk/client/index.js";
    import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
    import readline from "readline/promises";
    import dotenv from "dotenv";

    dotenv.config();

    const ANTHROPIC_API_KEY = process.env.ANTHROPIC_API_KEY;
    if (!ANTHROPIC_API_KEY) {
      throw new Error("ANTHROPIC_API_KEY is not set");
    }

    class MCPClient {
      private mcp: Client;
      private anthropic: Anthropic;
      private transport: StdioClientTransport | null = null;
      private tools: Tool[] = [];

      constructor() {
        this.anthropic = new Anthropic({
          apiKey: ANTHROPIC_API_KEY,
        });
        this.mcp = new Client({ name: "mcp-client-cli", version: "1.0.0" });
      }
      // methods will go here
    }
    ```

    ### Server Connection Management

    Next, we'll implement the method to connect to an MCP server:

    ```typescript
    async connectToServer(serverScriptPath: string) {
      try {
        const isJs = serverScriptPath.endsWith(".js");
        const isPy = serverScriptPath.endsWith(".py");
        if (!isJs && !isPy) {
          throw new Error("Server script must be a .js or .py file");
        }
        const command = isPy
          ? process.platform === "win32"
            ? "python"
            : "python3"
          : process.execPath;

        this.transport = new StdioClientTransport({
          command,
          args: [serverScriptPath],
        });
        await this.mcp.connect(this.transport);

        const toolsResult = await this.mcp.listTools();
        this.tools = toolsResult.tools.map((tool) => {
          return {
            name: tool.name,
            description: tool.description,
            input_schema: tool.inputSchema,
          };
        });
        console.log(
          "Connected to server with tools:",
          this.tools.map(({ name }) => name)
        );
      } catch (e) {
        console.log("Failed to connect to MCP server: ", e);
        throw e;
      }
    }
    ```

    ### Query Processing Logic

    Now let's add the core functionality for processing queries and handling tool calls:

    ```typescript
    async processQuery(query: string) {
      const messages: MessageParam[] = [
        {
          role: "user",
          content: query,
        },
      ];

      const response = await this.anthropic.messages.create({
        model: "claude-3-5-sonnet-20241022",
        max_tokens: 1000,
        messages,
        tools: this.tools,
      });

      const finalText = [];

      for (const content of response.content) {
        if (content.type === "text") {
          finalText.push(content.text);
        } else if (content.type === "tool_use") {
          const toolName = content.name;
          const toolArgs = content.input as { [x: string]: unknown } | undefined;

          const result = await this.mcp.callTool({
            name: toolName,
            arguments: toolArgs,
          });
          finalText.push(
            `[Calling tool ${toolName} with args ${JSON.stringify(toolArgs)}]`
          );

          messages.push({
            role: "user",
            content: result.content as string,
          });

          const response = await this.anthropic.messages.create({
            model: "claude-3-5-sonnet-20241022",
            max_tokens: 1000,
            messages,
          });

          finalText.push(
            response.content[0].type === "text" ? response.content[0].text : ""
          );
        }
      }

      return finalText.join("\n");
    }
    ```

    ### Interactive Chat Interface

    Now we'll add the chat loop and cleanup functionality:

    ```typescript
    async chatLoop() {
      const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
      });

      try {
        console.log("\nMCP Client Started!");
        console.log("Type your queries or 'quit' to exit.");

        while (true) {
          const message = await rl.question("\nQuery: ");
          if (message.toLowerCase() === "quit") {
            break;
          }
          const response = await this.processQuery(message);
          console.log("\n" + response);
        }
      } finally {
        rl.close();
      }
    }

    async cleanup() {
      await this.mcp.close();
    }
    ```

    ### Main Entry Point

    Finally, we'll add the main execution logic:

    ```typescript
    async function main() {
      if (process.argv.length < 3) {
        console.log("Usage: node index.ts <path_to_server_script>");
        return;
      }
      const mcpClient = new MCPClient();
      try {
        await mcpClient.connectToServer(process.argv[2]);
        await mcpClient.chatLoop();
      } finally {
        await mcpClient.cleanup();
        process.exit(0);
      }
    }

    main();
    ```

    ## Running the Client

    To run your client with any MCP server:

    ```bash
    # Build TypeScript
    npm run build

    # Run the client
    node build/index.js path/to/server.py # python server
    node build/index.js path/to/build/index.js # node server
    ```

    <Note>
      If you're continuing the weather tutorial from the server quickstart, your command might look something like this: `node build/index.js .../quickstart-resources/weather-server-typescript/build/index.js`
    </Note>

    **The client will:**

    1. Connect to the specified server
    2. List available tools
    3. Start an interactive chat session where you can:
       * Enter queries
       * See tool executions
       * Get responses from Claude

    ## How It Works

    When you submit a query:

    1. The client gets the list of available tools from the server
    2. Your query is sent to Claude along with tool descriptions
    3. Claude decides which tools (if any) to use
    4. The client executes any requested tool calls through the server
    5. Results are sent back to Claude
    6. Claude provides a natural language response
    7. The response is displayed to you

    ## Best practices

    1. **Error Handling**
       * Use TypeScript's type system for better error detection
       * Wrap tool calls in try-catch blocks
       * Provide meaningful error messages
       * Gracefully handle connection issues

    2. **Security**
       * Store API keys securely in `.env`
       * Validate server responses
       * Be cautious with tool permissions

    ## Troubleshooting

    ### Server Path Issues

    * Double-check the path to your server script is correct
    * Use the absolute path if the relative path isn't working
    * For Windows users, make sure to use forward slashes (/) or escaped backslashes (\\) in the path
    * Verify the server file has the correct extension (.js for Node.js or .py for Python)

    Example of correct path usage:

    ```bash
    # Relative path
    node build/index.js ./server/build/index.js

    # Absolute path
    node build/index.js /Users/username/projects/mcp-server/build/index.js

    # Windows path (either format works)
    node build/index.js C:/projects/mcp-server/build/index.js
    node build/index.js C:\\projects\\mcp-server\\build\\index.js
    ```

    ### Response Timing

    * The first response might take up to 30 seconds to return
    * This is normal and happens while:
      * The server initializes
      * Claude processes the query
      * Tools are being executed
    * Subsequent responses are typically faster
    * Don't interrupt the process during this initial waiting period

    ### Common Error Messages

    If you see:

    * `Error: Cannot find module`: Check your build folder and ensure TypeScript compilation succeeded
    * `Connection refused`: Ensure the server is running and the path is correct
    * `Tool execution failed`: Verify the tool's required environment variables are set
    * `ANTHROPIC_API_KEY is not set`: Check your .env file and environment variables
    * `TypeError`: Ensure you're using the correct types for tool arguments
  </Tab>

  <Tab title="Java">
    <Note>
      This is a quickstart demo based on Spring AI MCP auto-configuration and boot starters.
      To learn how to create sync and async MCP Clients manually, consult the [Java SDK Client](/sdk/java/mcp-client) documentation
    </Note>

    This example demonstrates how to build an interactive chatbot that combines Spring AI's Model Context Protocol (MCP) with the [Brave Search MCP Server](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/brave-search). The application creates a conversational interface powered by Anthropic's Claude AI model that can perform internet searches through Brave Search, enabling natural language interactions with real-time web data.
    [You can find the complete code for this tutorial here.](https://github.com/spring-projects/spring-ai-examples/tree/main/model-context-protocol/web-search/brave-chatbot)

    ## System Requirements

    Before starting, ensure your system meets these requirements:

    * Java 17 or higher
    * Maven 3.6+
    * npx package manager
    * Anthropic API key (Claude)
    * Brave Search API key

    ## Setting Up Your Environment

    1. Install npx (Node Package eXecute):
       First, make sure to install [npm](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm)
       and then run:

       ```bash
       npm install -g npx
       ```

    2. Clone the repository:

       ```bash
       git clone https://github.com/spring-projects/spring-ai-examples.git
       cd model-context-protocol/brave-chatbot
       ```

    3. Set up your API keys:

       ```bash
       export ANTHROPIC_API_KEY='your-anthropic-api-key-here'
       export BRAVE_API_KEY='your-brave-api-key-here'
       ```

    4. Build the application:

       ```bash
       ./mvnw clean install
       ```

    5. Run the application using Maven:
       ```bash
       ./mvnw spring-boot:run
       ```

    <Warning>
      Make sure you keep your `ANTHROPIC_API_KEY` and `BRAVE_API_KEY` keys secure!
    </Warning>

    ## How it Works

    The application integrates Spring AI with the Brave Search MCP server through several components:

    ### MCP Client Configuration

    1. Required dependencies in pom.xml:

    ```xml
    <dependency>
        <groupId>org.springframework.ai</groupId>
        <artifactId>spring-ai-starter-mcp-client</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.ai</groupId>
        <artifactId>spring-ai-starter-model-anthropic</artifactId>
    </dependency>
    ```

    2. Application properties (application.yml):

    ```yml
    spring:
      ai:
        mcp:
          client:
            enabled: true
            name: brave-search-client
            version: 1.0.0
            type: SYNC
            request-timeout: 20s
            stdio:
              root-change-notification: true
              servers-configuration: classpath:/mcp-servers-config.json
            toolcallback:
              enabled: true
        anthropic:
          api-key: ${ANTHROPIC_API_KEY}
    ```

    This activates the `spring-ai-starter-mcp-client` to create one or more `McpClient`s based on the provided server configuration.
    The `spring.ai.mcp.client.toolcallback.enabled=true` property enables the tool callback mechanism, that automatically registers all MCP tool as spring ai tools.
    It is disabled by default.

    3. MCP Server Configuration (`mcp-servers-config.json`):

    ```json
    {
      "mcpServers": {
        "brave-search": {
          "command": "npx",
          "args": ["-y", "@modelcontextprotocol/server-brave-search"],
          "env": {
            "BRAVE_API_KEY": "<PUT YOUR BRAVE API KEY>"
          }
        }
      }
    }
    ```

    ### Chat Implementation

    The chatbot is implemented using Spring AI's ChatClient with MCP tool integration:

    ```java
    var chatClient = chatClientBuilder
        .defaultSystem("You are useful assistant, expert in AI and Java.")
        .defaultToolCallbacks((Object[]) mcpToolAdapter.toolCallbacks())
        .defaultAdvisors(new MessageChatMemoryAdvisor(new InMemoryChatMemory()))
        .build();
    ```

    Key features:

    * Uses Claude AI model for natural language understanding
    * Integrates Brave Search through MCP for real-time web search capabilities
    * Maintains conversation memory using InMemoryChatMemory
    * Runs as an interactive command-line application

    ### Build and run

    ```bash
    ./mvnw clean install
    java -jar ./target/ai-mcp-brave-chatbot-0.0.1-SNAPSHOT.jar
    ```

    or

    ```bash
    ./mvnw spring-boot:run
    ```

    The application will start an interactive chat session where you can ask questions. The chatbot will use Brave Search when it needs to find information from the internet to answer your queries.

    The chatbot can:

    * Answer questions using its built-in knowledge
    * Perform web searches when needed using Brave Search
    * Remember context from previous messages in the conversation
    * Combine information from multiple sources to provide comprehensive answers

    ### Advanced Configuration

    The MCP client supports additional configuration options:

    * Client customization through `McpSyncClientCustomizer` or `McpAsyncClientCustomizer`
    * Multiple clients with multiple transport types: `STDIO` and `SSE` (Server-Sent Events)
    * Integration with Spring AI's tool execution framework
    * Automatic client initialization and lifecycle management

    For WebFlux-based applications, you can use the WebFlux starter instead:

    ```xml
    <dependency>
        <groupId>org.springframework.ai</groupId>
        <artifactId>spring-ai-mcp-client-webflux-spring-boot-starter</artifactId>
    </dependency>
    ```

    This provides similar functionality but uses a WebFlux-based SSE transport implementation, recommended for production deployments.
  </Tab>

  <Tab title="Kotlin">
    [You can find the complete code for this tutorial here.](https://github.com/modelcontextprotocol/kotlin-sdk/tree/main/samples/kotlin-mcp-client)

    ## System Requirements

    Before starting, ensure your system meets these requirements:

    * Java 17 or higher
    * Anthropic API key (Claude)

    ## Setting up your environment

    First, let's install `java` and `gradle` if you haven't already.
    You can download `java` from [official Oracle JDK website](https://www.oracle.com/java/technologies/downloads/).
    Verify your `java` installation:

    ```bash
    java --version
    ```

    Now, let's create and set up your project:

    <CodeGroup>
      ```bash macOS/Linux
      # Create a new directory for our project
      mkdir kotlin-mcp-client
      cd kotlin-mcp-client

      # Initialize a new kotlin project
      gradle init
      ```

      ```powershell Windows
      # Create a new directory for our project
      md kotlin-mcp-client
      cd kotlin-mcp-client
      # Initialize a new kotlin project
      gradle init
      ```
    </CodeGroup>

    After running `gradle init`, you will be presented with options for creating your project.
    Select **Application** as the project type, **Kotlin** as the programming language, and **Java 17** as the Java version.

    Alternatively, you can create a Kotlin application using the [IntelliJ IDEA project wizard](https://kotlinlang.org/docs/jvm-get-started.html).

    After creating the project, add the following dependencies:

    <CodeGroup>
      ```kotlin build.gradle.kts
      val mcpVersion = "0.4.0"
      val slf4jVersion = "2.0.9"
      val anthropicVersion = "0.8.0"

      dependencies {
          implementation("io.modelcontextprotocol:kotlin-sdk:$mcpVersion")
          implementation("org.slf4j:slf4j-nop:$slf4jVersion")
          implementation("com.anthropic:anthropic-java:$anthropicVersion")
      }
      ```

      ```groovy build.gradle
      def mcpVersion = '0.3.0'
      def slf4jVersion = '2.0.9'
      def anthropicVersion = '0.8.0'
      dependencies {
          implementation "io.modelcontextprotocol:kotlin-sdk:$mcpVersion"
          implementation "org.slf4j:slf4j-nop:$slf4jVersion"
          implementation "com.anthropic:anthropic-java:$anthropicVersion"
      }
      ```
    </CodeGroup>

    Also, add the following plugins to your build script:

    <CodeGroup>
      ```kotlin build.gradle.kts
      plugins {
          id("com.github.johnrengelman.shadow") version "8.1.1"
      }
      ```

      ```groovy build.gradle
      plugins {
          id 'com.github.johnrengelman.shadow' version '8.1.1'
      }
      ```
    </CodeGroup>

    ## Setting up your API key

    You'll need an Anthropic API key from the [Anthropic Console](https://console.anthropic.com/settings/keys).

    Set up your API key:

    ```bash
    export ANTHROPIC_API_KEY='your-anthropic-api-key-here'
    ```

    <Warning>
      Make sure your keep your `ANTHROPIC_API_KEY` secure!
    </Warning>

    ## Creating the Client

    ### Basic Client Structure

    First, let's create the basic client class:

    ```kotlin
    class MCPClient : AutoCloseable {
        private val anthropic = AnthropicOkHttpClient.fromEnv()
        private val mcp: Client = Client(clientInfo = Implementation(name = "mcp-client-cli", version = "1.0.0"))
        private lateinit var tools: List<ToolUnion>

        // methods will go here

        override fun close() {
            runBlocking {
                mcp.close()
                anthropic.close()
            }
        }
    ```

    ### Server connection management

    Next, we'll implement the method to connect to an MCP server:

    ```kotlin
    suspend fun connectToServer(serverScriptPath: String) {
        try {
            val command = buildList {
                when (serverScriptPath.substringAfterLast(".")) {
                    "js" -> add("node")
                    "py" -> add(if (System.getProperty("os.name").lowercase().contains("win")) "python" else "python3")
                    "jar" -> addAll(listOf("java", "-jar"))
                    else -> throw IllegalArgumentException("Server script must be a .js, .py or .jar file")
                }
                add(serverScriptPath)
            }

            val process = ProcessBuilder(command).start()
            val transport = StdioClientTransport(
                input = process.inputStream.asSource().buffered(),
                output = process.outputStream.asSink().buffered()
            )

            mcp.connect(transport)

            val toolsResult = mcp.listTools()
            tools = toolsResult?.tools?.map { tool ->
                ToolUnion.ofTool(
                    Tool.builder()
                        .name(tool.name)
                        .description(tool.description ?: "")
                        .inputSchema(
                            Tool.InputSchema.builder()
                                .type(JsonValue.from(tool.inputSchema.type))
                                .properties(tool.inputSchema.properties.toJsonValue())
                                .putAdditionalProperty("required", JsonValue.from(tool.inputSchema.required))
                                .build()
                        )
                        .build()
                )
            } ?: emptyList()
            println("Connected to server with tools: ${tools.joinToString(", ") { it.tool().get().name() }}")
        } catch (e: Exception) {
            println("Failed to connect to MCP server: $e")
            throw e
        }
    }
    ```

    Also create a helper function to convert from `JsonObject` to `JsonValue` for Anthropic:

    ```kotlin
    private fun JsonObject.toJsonValue(): JsonValue {
        val mapper = ObjectMapper()
        val node = mapper.readTree(this.toString())
        return JsonValue.fromJsonNode(node)
    }
    ```

    ### Query processing logic

    Now let's add the core functionality for processing queries and handling tool calls:

    ```kotlin
    private val messageParamsBuilder: MessageCreateParams.Builder = MessageCreateParams.builder()
        .model(Model.CLAUDE_3_5_SONNET_20241022)
        .maxTokens(1024)

    suspend fun processQuery(query: String): String {
        val messages = mutableListOf(
            MessageParam.builder()
                .role(MessageParam.Role.USER)
                .content(query)
                .build()
        )

        val response = anthropic.messages().create(
            messageParamsBuilder
                .messages(messages)
                .tools(tools)
                .build()
        )

        val finalText = mutableListOf<String>()
        response.content().forEach { content ->
            when {
                content.isText() -> finalText.add(content.text().getOrNull()?.text() ?: "")

                content.isToolUse() -> {
                    val toolName = content.toolUse().get().name()
                    val toolArgs =
                        content.toolUse().get()._input().convert(object : TypeReference<Map<String, JsonValue>>() {})

                    val result = mcp.callTool(
                        name = toolName,
                        arguments = toolArgs ?: emptyMap()
                    )
                    finalText.add("[Calling tool $toolName with args $toolArgs]")

                    messages.add(
                        MessageParam.builder()
                            .role(MessageParam.Role.USER)
                            .content(
                                """
                                    "type": "tool_result",
                                    "tool_name": $toolName,
                                    "result": ${result?.content?.joinToString("\n") { (it as TextContent).text ?: "" }}
                                """.trimIndent()
                            )
                            .build()
                    )

                    val aiResponse = anthropic.messages().create(
                        messageParamsBuilder
                            .messages(messages)
                            .build()
                    )

                    finalText.add(aiResponse.content().first().text().getOrNull()?.text() ?: "")
                }
            }
        }

        return finalText.joinToString("\n", prefix = "", postfix = "")
    }
    ```

    ### Interactive chat

    We'll add the chat loop:

    ```kotlin
    suspend fun chatLoop() {
        println("\nMCP Client Started!")
        println("Type your queries or 'quit' to exit.")

        while (true) {
            print("\nQuery: ")
            val message = readLine() ?: break
            if (message.lowercase() == "quit") break
            val response = processQuery(message)
            println("\n$response")
        }
    }
    ```

    ### Main entry point

    Finally, we'll add the main execution function:

    ```kotlin
    fun main(args: Array<String>) = runBlocking {
        if (args.isEmpty()) throw IllegalArgumentException("Usage: java -jar <your_path>/build/libs/kotlin-mcp-client-0.1.0-all.jar <path_to_server_script>")
        val serverPath = args.first()
        val client = MCPClient()
        client.use {
            client.connectToServer(serverPath)
            client.chatLoop()
        }
    }
    ```

    ## Running the client

    To run your client with any MCP server:

    ```bash
    ./gradlew build

    # Run the client
    java -jar build/libs/<your-jar-name>.jar path/to/server.jar # jvm server
    java -jar build/libs/<your-jar-name>.jar path/to/server.py # python server
    java -jar build/libs/<your-jar-name>.jar path/to/build/index.js # node server
    ```

    <Note>
      If you're continuing the weather tutorial from the server quickstart, your command might look something like this: `java -jar build/libs/kotlin-mcp-client-0.1.0-all.jar .../samples/weather-stdio-server/build/libs/weather-stdio-server-0.1.0-all.jar`
    </Note>

    **The client will:**

    1. Connect to the specified server
    2. List available tools
    3. Start an interactive chat session where you can:
       * Enter queries
       * See tool executions
       * Get responses from Claude

    ## How it works

    Here's a high-level workflow schema:

    ```mermaid
    ---
    config:
        theme: neutral
    ---
    sequenceDiagram
        actor User
        participant Client
        participant Claude
        participant MCP_Server as MCP Server
        participant Tools

        User->>Client: Send query
        Client<<->>MCP_Server: Get available tools
        Client->>Claude: Send query with tool descriptions
        Claude-->>Client: Decide tool execution
        Client->>MCP_Server: Request tool execution
        MCP_Server->>Tools: Execute chosen tools
        Tools-->>MCP_Server: Return results
        MCP_Server-->>Client: Send results
        Client->>Claude: Send tool results
        Claude-->>Client: Provide final response
        Client-->>User: Display response
    ```

    When you submit a query:

    1. The client gets the list of available tools from the server
    2. Your query is sent to Claude along with tool descriptions
    3. Claude decides which tools (if any) to use
    4. The client executes any requested tool calls through the server
    5. Results are sent back to Claude
    6. Claude provides a natural language response
    7. The response is displayed to you

    ## Best practices

    1. **Error Handling**
       * Leverage Kotlin's type system to model errors explicitly
       * Wrap external tool and API calls in `try-catch` blocks when exceptions are possible
       * Provide clear and meaningful error messages
       * Handle network timeouts and connection issues gracefully

    2. **Security**
       * Store API keys and secrets securely in `local.properties`, environment variables, or secret managers
       * Validate all external responses to avoid unexpected or unsafe data usage
       * Be cautious with permissions and trust boundaries when using tools

    ## Troubleshooting

    ### Server Path Issues

    * Double-check the path to your server script is correct
    * Use the absolute path if the relative path isn't working
    * For Windows users, make sure to use forward slashes (/) or escaped backslashes (\\) in the path
    * Make sure that the required runtime is installed (java for Java, npm for Node.js, or uv for Python)
    * Verify the server file has the correct extension (.jar for Java, .js for Node.js or .py for Python)

    Example of correct path usage:

    ```bash
    # Relative path
    java -jar build/libs/client.jar ./server/build/libs/server.jar

    # Absolute path
    java -jar build/libs/client.jar /Users/username/projects/mcp-server/build/libs/server.jar

    # Windows path (either format works)
    java -jar build/libs/client.jar C:/projects/mcp-server/build/libs/server.jar
    java -jar build/libs/client.jar C:\\projects\\mcp-server\\build\\libs\\server.jar
    ```

    ### Response Timing

    * The first response might take up to 30 seconds to return
    * This is normal and happens while:
      * The server initializes
      * Claude processes the query
      * Tools are being executed
    * Subsequent responses are typically faster
    * Don't interrupt the process during this initial waiting period

    ### Common Error Messages

    If you see:

    * `Connection refused`: Ensure the server is running and the path is correct
    * `Tool execution failed`: Verify the tool's required environment variables are set
    * `ANTHROPIC_API_KEY is not set`: Check your environment variables
  </Tab>

  <Tab title="C#">
    [You can find the complete code for this tutorial here.](https://github.com/modelcontextprotocol/csharp-sdk/tree/main/samples/QuickstartClient)

    ## System Requirements

    Before starting, ensure your system meets these requirements:

    * .NET 8.0 or higher
    * Anthropic API key (Claude)
    * Windows, Linux, or macOS

    ## Setting up your environment

    First, create a new .NET project:

    ```bash
    dotnet new console -n QuickstartClient
    cd QuickstartClient
    ```

    Then, add the required dependencies to your project:

    ```bash
    dotnet add package ModelContextProtocol --prerelease
    dotnet add package Anthropic.SDK
    dotnet add package Microsoft.Extensions.Hosting
    dotnet add package Microsoft.Extensions.AI
    ```

    ## Setting up your API key

    You'll need an Anthropic API key from the [Anthropic Console](https://console.anthropic.com/settings/keys).

    ```bash
    dotnet user-secrets init
    dotnet user-secrets set "ANTHROPIC_API_KEY" "<your key here>"
    ```

    ## Creating the Client

    ### Basic Client Structure

    First, let's setup the basic client class in the file `Program.cs`:

    ```csharp
    using Anthropic.SDK;
    using Microsoft.Extensions.AI;
    using Microsoft.Extensions.Configuration;
    using Microsoft.Extensions.Hosting;
    using ModelContextProtocol.Client;
    using ModelContextProtocol.Protocol.Transport;

    var builder = Host.CreateApplicationBuilder(args);

    builder.Configuration
        .AddEnvironmentVariables()
        .AddUserSecrets<Program>();
    ```

    This creates the beginnings of a .NET console application that can read the API key from user secrets.

    Next, we'll setup the MCP Client:

    ```csharp
    var (command, arguments) = GetCommandAndArguments(args);

    var clientTransport = new StdioClientTransport(new()
    {
        Name = "Demo Server",
        Command = command,
        Arguments = arguments,
    });

    await using var mcpClient = await McpClientFactory.CreateAsync(clientTransport);

    var tools = await mcpClient.ListToolsAsync();
    foreach (var tool in tools)
    {
        Console.WriteLine($"Connected to server with tools: {tool.Name}");
    }
    ```

    Add this function at the end of the `Program.cs` file:

    ```csharp
    static (string command, string[] arguments) GetCommandAndArguments(string[] args)
    {
        return args switch
        {
            [var script] when script.EndsWith(".py") => ("python", args),
            [var script] when script.EndsWith(".js") => ("node", args),
            [var script] when Directory.Exists(script) || (File.Exists(script) && script.EndsWith(".csproj")) => ("dotnet", ["run", "--project", script, "--no-build"]),
            _ => throw new NotSupportedException("An unsupported server script was provided. Supported scripts are .py, .js, or .csproj")
        };
    }
    ```

    This creates an MCP client that will connect to a server that is provided as a command line argument. It then lists the available tools from the connected server.

    ### Query processing logic

    Now let's add the core functionality for processing queries and handling tool calls:

    ```csharp
    using var anthropicClient = new AnthropicClient(new APIAuthentication(builder.Configuration["ANTHROPIC_API_KEY"]))
        .Messages
        .AsBuilder()
        .UseFunctionInvocation()
        .Build();

    var options = new ChatOptions
    {
        MaxOutputTokens = 1000,
        ModelId = "claude-3-5-sonnet-20241022",
        Tools = [.. tools]
    };

    Console.ForegroundColor = ConsoleColor.Green;
    Console.WriteLine("MCP Client Started!");
    Console.ResetColor();

    PromptForInput();
    while(Console.ReadLine() is string query && !"exit".Equals(query, StringComparison.OrdinalIgnoreCase))
    {
        if (string.IsNullOrWhiteSpace(query))
        {
            PromptForInput();
            continue;
        }

        await foreach (var message in anthropicClient.GetStreamingResponseAsync(query, options))
        {
            Console.Write(message);
        }
        Console.WriteLine();

        PromptForInput();
    }

    static void PromptForInput()
    {
        Console.WriteLine("Enter a command (or 'exit' to quit):");
        Console.ForegroundColor = ConsoleColor.Cyan;
        Console.Write("> ");
        Console.ResetColor();
    }
    ```

    ## Key Components Explained

    ### 1. Client Initialization

    * The client is initialized using `McpClientFactory.CreateAsync()`, which sets up the transport type and command to run the server.

    ### 2. Server Connection

    * Supports Python, Node.js, and .NET servers.
    * The server is started using the command specified in the arguments.
    * Configures to use stdio for communication with the server.
    * Initializes the session and available tools.

    ### 3. Query Processing

    * Leverages [Microsoft.Extensions.AI](https://learn.microsoft.com/dotnet/ai/ai-extensions) for the chat client.
    * Configures the `IChatClient` to use automatic tool (function) invocation.
    * The client reads user input and sends it to the server.
    * The server processes the query and returns a response.
    * The response is displayed to the user.

    ## Running the Client

    To run your client with any MCP server:

    ```bash
    dotnet run -- path/to/server.csproj # dotnet server
    dotnet run -- path/to/server.py # python server
    dotnet run -- path/to/server.js # node server
    ```

    <Note>
      If you're continuing the weather tutorial from the server quickstart, your command might look something like this: `dotnet run -- path/to/QuickstartWeatherServer`.
    </Note>

    The client will:

    1. Connect to the specified server
    2. List available tools
    3. Start an interactive chat session where you can:
       * Enter queries
       * See tool executions
       * Get responses from Claude
    4. Exit the session when done

    Here's an example of what it should look like it connected to a weather server quickstart:

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-dotnet-client.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=fcf28dde150d6db879402ad8150c6b23" data-og-width="1115" width="1115" data-og-height="666" height="666" data-path="images/quickstart-dotnet-client.png" data-optimize="true" data-opv="2" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-dotnet-client.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0c82cdfe1350b4a924a44d7beaa39f70 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-dotnet-client.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=4fd6f3ed867741b44ae12940788be646 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-dotnet-client.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=1b5fcfaf8b63b9ea71bf36aa20388a28 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-dotnet-client.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=cb969889d05ec8771c12b887f2940c7d 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-dotnet-client.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=81b2cb62f60a9f3afb2d66cf3ee3df79 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-dotnet-client.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=ac9271a3dd0d7b424bb390ad0c31e14e 2500w" />
    </Frame>
  </Tab>
</Tabs>

## Next steps

<CardGroup cols={2}>
  <Card title="Example servers" icon="grid" href="/examples">
    Check out our gallery of official MCP servers and implementations
  </Card>

  <Card title="Example clients" icon="cubes" href="/clients">
    View the list of clients that support MCP integrations
  </Card>
</CardGroup>


# Build an MCP server
Source: https://modelcontextprotocol.io/docs/develop/build-server

Get started building your own server to use in Claude for Desktop and other clients.

In this tutorial, we'll build a simple MCP weather server and connect it to a host, Claude for Desktop.

### What we'll be building

We'll build a server that exposes two tools: `get_alerts` and `get_forecast`. Then we'll connect the server to an MCP host (in this case, Claude for Desktop):

<Frame>
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=dce7b2f8a06c20ba358e4bd2e75fa4c7" data-og-width="2780" width="2780" data-og-height="1849" height="1849" data-path="images/current-weather.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=bbb19f34c5df59f66bc6bbb75d2bc5ed 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=2392d7e765b897c5b78f9f53d41439d4 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=dc349e75341b046d35a649762774da49 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=deeb99214d9383ee4a0c8aaacb120049 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=5c6f948059635e376deeadce3893e9b9 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=3922160478785cc88d5e98d418e8f7dd 2500w" data-optimize="true" data-opv="2" />
</Frame>

<Note>
  Servers can connect to any client. We've chosen Claude for Desktop here for simplicity, but we also have guides on [building your own client](/docs/develop/build-client) as well as a [list of other clients here](/clients).
</Note>

### Core MCP Concepts

MCP servers can provide three main types of capabilities:

1. **[Resources](/docs/learn/server-concepts#resources)**: File-like data that can be read by clients (like API responses or file contents)
2. **[Tools](/docs/learn/server-concepts#tools)**: Functions that can be called by the LLM (with user approval)
3. **[Prompts](/docs/learn/server-concepts#prompts)**: Pre-written templates that help users accomplish specific tasks

This tutorial will primarily focus on tools.

<Tabs>
  <Tab title="Python">
    Let's get started with building our weather server! [You can find the complete code for what we'll be building here.](https://github.com/modelcontextprotocol/quickstart-resources/tree/main/weather-server-python)

    ### Prerequisite knowledge

    This quickstart assumes you have familiarity with:

    * Python
    * LLMs like Claude

    ### Logging in MCP Servers

    When implementing MCP servers, be careful about how you handle logging:

    **For STDIO-based servers:** Never write to standard output (stdout). This includes:

    * `print()` statements in Python
    * `console.log()` in JavaScript
    * `fmt.Println()` in Go
    * Similar stdout functions in other languages

    Writing to stdout will corrupt the JSON-RPC messages and break your server.

    **For HTTP-based servers:** Standard output logging is fine since it doesn't interfere with HTTP responses.

    ### Best Practices

    1. Use a logging library that writes to stderr or files.

    ### Quick Examples

    ```python
    # ❌ Bad (STDIO)
    print("Processing request")

    # ✅ Good (STDIO)
    import logging
    logging.info("Processing request")
    ```

    ### System requirements

    * Python 3.10 or higher installed.
    * You must use the Python MCP SDK 1.2.0 or higher.

    ### Set up your environment

    First, let's install `uv` and set up our Python project and environment:

    <CodeGroup>
      ```bash macOS/Linux
      curl -LsSf https://astral.sh/uv/install.sh | sh
      ```

      ```powershell Windows
      powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"
      ```
    </CodeGroup>

    Make sure to restart your terminal afterwards to ensure that the `uv` command gets picked up.

    Now, let's create and set up our project:

    <CodeGroup>
      ```bash macOS/Linux
      # Create a new directory for our project
      uv init weather
      cd weather

      # Create virtual environment and activate it
      uv venv
      source .venv/bin/activate

      # Install dependencies
      uv add "mcp[cli]" httpx

      # Create our server file
      touch weather.py
      ```

      ```powershell Windows
      # Create a new directory for our project
      uv init weather
      cd weather

      # Create virtual environment and activate it
      uv venv
      .venv\Scripts\activate

      # Install dependencies
      uv add mcp[cli] httpx

      # Create our server file
      new-item weather.py
      ```
    </CodeGroup>

    Now let's dive into building your server.

    ## Building your server

    ### Importing packages and setting up the instance

    Add these to the top of your `weather.py`:

    ```python
    from typing import Any
    import httpx
    from mcp.server.fastmcp import FastMCP

    # Initialize FastMCP server
    mcp = FastMCP("weather")

    # Constants
    NWS_API_BASE = "https://api.weather.gov"
    USER_AGENT = "weather-app/1.0"
    ```

    The FastMCP class uses Python type hints and docstrings to automatically generate tool definitions, making it easy to create and maintain MCP tools.

    ### Helper functions

    Next, let's add our helper functions for querying and formatting the data from the National Weather Service API:

    ```python
    async def make_nws_request(url: str) -> dict[str, Any] | None:
        """Make a request to the NWS API with proper error handling."""
        headers = {
            "User-Agent": USER_AGENT,
            "Accept": "application/geo+json"
        }
        async with httpx.AsyncClient() as client:
            try:
                response = await client.get(url, headers=headers, timeout=30.0)
                response.raise_for_status()
                return response.json()
            except Exception:
                return None

    def format_alert(feature: dict) -> str:
        """Format an alert feature into a readable string."""
        props = feature["properties"]
        return f"""
    Event: {props.get('event', 'Unknown')}
    Area: {props.get('areaDesc', 'Unknown')}
    Severity: {props.get('severity', 'Unknown')}
    Description: {props.get('description', 'No description available')}
    Instructions: {props.get('instruction', 'No specific instructions provided')}
    """
    ```

    ### Implementing tool execution

    The tool execution handler is responsible for actually executing the logic of each tool. Let's add it:

    ```python
    @mcp.tool()
    async def get_alerts(state: str) -> str:
        """Get weather alerts for a US state.

        Args:
            state: Two-letter US state code (e.g. CA, NY)
        """
        url = f"{NWS_API_BASE}/alerts/active/area/{state}"
        data = await make_nws_request(url)

        if not data or "features" not in data:
            return "Unable to fetch alerts or no alerts found."

        if not data["features"]:
            return "No active alerts for this state."

        alerts = [format_alert(feature) for feature in data["features"]]
        return "\n---\n".join(alerts)

    @mcp.tool()
    async def get_forecast(latitude: float, longitude: float) -> str:
        """Get weather forecast for a location.

        Args:
            latitude: Latitude of the location
            longitude: Longitude of the location
        """
        # First get the forecast grid endpoint
        points_url = f"{NWS_API_BASE}/points/{latitude},{longitude}"
        points_data = await make_nws_request(points_url)

        if not points_data:
            return "Unable to fetch forecast data for this location."

        # Get the forecast URL from the points response
        forecast_url = points_data["properties"]["forecast"]
        forecast_data = await make_nws_request(forecast_url)

        if not forecast_data:
            return "Unable to fetch detailed forecast."

        # Format the periods into a readable forecast
        periods = forecast_data["properties"]["periods"]
        forecasts = []
        for period in periods[:5]:  # Only show next 5 periods
            forecast = f"""
    {period['name']}:
    Temperature: {period['temperature']}°{period['temperatureUnit']}
    Wind: {period['windSpeed']} {period['windDirection']}
    Forecast: {period['detailedForecast']}
    """
            forecasts.append(forecast)

        return "\n---\n".join(forecasts)
    ```

    ### Running the server

    Finally, let's initialize and run the server:

    ```python
    if __name__ == "__main__":
        # Initialize and run the server
        mcp.run(transport='stdio')
    ```

    Your server is complete! Run `uv run weather.py` to start the MCP server, which will listen for messages from MCP hosts.

    Let's now test your server from an existing MCP host, Claude for Desktop.

    ## Testing your server with Claude for Desktop

    <Note>
      Claude for Desktop is not yet available on Linux. Linux users can proceed to the [Building a client](/docs/develop/build-client) tutorial to build an MCP client that connects to the server we just built.
    </Note>

    First, make sure you have Claude for Desktop installed. [You can install the latest version
    here.](https://claude.ai/download) If you already have Claude for Desktop, **make sure it's updated to the latest version.**

    We'll need to configure Claude for Desktop for whichever MCP servers you want to use. To do this, open your Claude for Desktop App configuration at `~/Library/Application Support/Claude/claude_desktop_config.json` in a text editor. Make sure to create the file if it doesn't exist.

    For example, if you have [VS Code](https://code.visualstudio.com/) installed:

    <CodeGroup>
      ```bash macOS/Linux
      code ~/Library/Application\ Support/Claude/claude_desktop_config.json
      ```

      ```powershell Windows
      code $env:AppData\Claude\claude_desktop_config.json
      ```
    </CodeGroup>

    You'll then add your servers in the `mcpServers` key. The MCP UI elements will only show up in Claude for Desktop if at least one server is properly configured.

    In this case, we'll add our single weather server like so:

    <CodeGroup>
      ```json macOS/Linux
      {
        "mcpServers": {
          "weather": {
            "command": "uv",
            "args": [
              "--directory",
              "/ABSOLUTE/PATH/TO/PARENT/FOLDER/weather",
              "run",
              "weather.py"
            ]
          }
        }
      }
      ```

      ```json Windows
      {
        "mcpServers": {
          "weather": {
            "command": "uv",
            "args": [
              "--directory",
              "C:\\ABSOLUTE\\PATH\\TO\\PARENT\\FOLDER\\weather",
              "run",
              "weather.py"
            ]
          }
        }
      }
      ```
    </CodeGroup>

    <Warning>
      You may need to put the full path to the `uv` executable in the `command` field. You can get this by running `which uv` on macOS/Linux or `where uv` on Windows.
    </Warning>

    <Note>
      Make sure you pass in the absolute path to your server. You can get this by running `pwd` on macOS/Linux or `cd` on Windows Command Prompt. On Windows, remember to use double backslashes (`\\`) or forward slashes (`/`) in the JSON path.
    </Note>

    This tells Claude for Desktop:

    1. There's an MCP server named "weather"
    2. To launch it by running `uv --directory /ABSOLUTE/PATH/TO/PARENT/FOLDER/weather run weather.py`

    Save the file, and restart **Claude for Desktop**.
  </Tab>

  <Tab title="Node">
    Let's get started with building our weather server! [You can find the complete code for what we'll be building here.](https://github.com/modelcontextprotocol/quickstart-resources/tree/main/weather-server-typescript)

    ### Prerequisite knowledge

    This quickstart assumes you have familiarity with:

    * TypeScript
    * LLMs like Claude

    ### Logging in MCP Servers

    When implementing MCP servers, be careful about how you handle logging:

    **For STDIO-based servers:** Never write to standard output (stdout). This includes:

    * `print()` statements in Python
    * `console.log()` in JavaScript
    * `fmt.Println()` in Go
    * Similar stdout functions in other languages

    Writing to stdout will corrupt the JSON-RPC messages and break your server.

    **For HTTP-based servers:** Standard output logging is fine since it doesn't interfere with HTTP responses.

    ### Best Practices

    1. Use a logging library that writes to stderr or files, such as `logging` in Python.
    2. For JavaScript, be especially careful - `console.log()` writes to stdout by default

    ### Quick Examples

    ```javascript
    // ❌ Bad (STDIO)
    console.log("Server started");

    // ✅ Good (STDIO)
    console.error("Server started"); // stderr is safe
    ```

    ### System requirements

    For TypeScript, make sure you have the latest version of Node installed.

    ### Set up your environment

    First, let's install Node.js and npm if you haven't already. You can download them from [nodejs.org](https://nodejs.org/).
    Verify your Node.js installation:

    ```bash
    node --version
    npm --version
    ```

    For this tutorial, you'll need Node.js version 16 or higher.

    Now, let's create and set up our project:

    <CodeGroup>
      ```bash macOS/Linux
      # Create a new directory for our project
      mkdir weather
      cd weather

      # Initialize a new npm project
      npm init -y

      # Install dependencies
      npm install @modelcontextprotocol/sdk zod@3
      npm install -D @types/node typescript

      # Create our files
      mkdir src
      touch src/index.ts
      ```

      ```powershell Windows
      # Create a new directory for our project
      md weather
      cd weather

      # Initialize a new npm project
      npm init -y

      # Install dependencies
      npm install @modelcontextprotocol/sdk zod@3
      npm install -D @types/node typescript

      # Create our files
      md src
      new-item src\index.ts
      ```
    </CodeGroup>

    Update your package.json to add type: "module" and a build script:

    ```json package.json
    {
      "type": "module",
      "bin": {
        "weather": "./build/index.js"
      },
      "scripts": {
        "build": "tsc && chmod 755 build/index.js"
      },
      "files": ["build"]
    }
    ```

    Create a `tsconfig.json` in the root of your project:

    ```json tsconfig.json
    {
      "compilerOptions": {
        "target": "ES2022",
        "module": "Node16",
        "moduleResolution": "Node16",
        "outDir": "./build",
        "rootDir": "./src",
        "strict": true,
        "esModuleInterop": true,
        "skipLibCheck": true,
        "forceConsistentCasingInFileNames": true
      },
      "include": ["src/**/*"],
      "exclude": ["node_modules"]
    }
    ```

    Now let's dive into building your server.

    ## Building your server

    ### Importing packages and setting up the instance

    Add these to the top of your `src/index.ts`:

    ```typescript
    import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
    import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
    import { z } from "zod";

    const NWS_API_BASE = "https://api.weather.gov";
    const USER_AGENT = "weather-app/1.0";

    // Create server instance
    const server = new McpServer({
      name: "weather",
      version: "1.0.0",
      capabilities: {
        resources: {},
        tools: {},
      },
    });
    ```

    ### Helper functions

    Next, let's add our helper functions for querying and formatting the data from the National Weather Service API:

    ```typescript
    // Helper function for making NWS API requests
    async function makeNWSRequest<T>(url: string): Promise<T | null> {
      const headers = {
        "User-Agent": USER_AGENT,
        Accept: "application/geo+json",
      };

      try {
        const response = await fetch(url, { headers });
        if (!response.ok) {
          throw new Error(`HTTP error! status: ${response.status}`);
        }
        return (await response.json()) as T;
      } catch (error) {
        console.error("Error making NWS request:", error);
        return null;
      }
    }

    interface AlertFeature {
      properties: {
        event?: string;
        areaDesc?: string;
        severity?: string;
        status?: string;
        headline?: string;
      };
    }

    // Format alert data
    function formatAlert(feature: AlertFeature): string {
      const props = feature.properties;
      return [
        `Event: ${props.event || "Unknown"}`,
        `Area: ${props.areaDesc || "Unknown"}`,
        `Severity: ${props.severity || "Unknown"}`,
        `Status: ${props.status || "Unknown"}`,
        `Headline: ${props.headline || "No headline"}`,
        "---",
      ].join("\n");
    }

    interface ForecastPeriod {
      name?: string;
      temperature?: number;
      temperatureUnit?: string;
      windSpeed?: string;
      windDirection?: string;
      shortForecast?: string;
    }

    interface AlertsResponse {
      features: AlertFeature[];
    }

    interface PointsResponse {
      properties: {
        forecast?: string;
      };
    }

    interface ForecastResponse {
      properties: {
        periods: ForecastPeriod[];
      };
    }
    ```

    ### Implementing tool execution

    The tool execution handler is responsible for actually executing the logic of each tool. Let's add it:

    ```typescript
    // Register weather tools
    server.tool(
      "get_alerts",
      "Get weather alerts for a state",
      {
        state: z.string().length(2).describe("Two-letter state code (e.g. CA, NY)"),
      },
      async ({ state }) => {
        const stateCode = state.toUpperCase();
        const alertsUrl = `${NWS_API_BASE}/alerts?area=${stateCode}`;
        const alertsData = await makeNWSRequest<AlertsResponse>(alertsUrl);

        if (!alertsData) {
          return {
            content: [
              {
                type: "text",
                text: "Failed to retrieve alerts data",
              },
            ],
          };
        }

        const features = alertsData.features || [];
        if (features.length === 0) {
          return {
            content: [
              {
                type: "text",
                text: `No active alerts for ${stateCode}`,
              },
            ],
          };
        }

        const formattedAlerts = features.map(formatAlert);
        const alertsText = `Active alerts for ${stateCode}:\n\n${formattedAlerts.join("\n")}`;

        return {
          content: [
            {
              type: "text",
              text: alertsText,
            },
          ],
        };
      },
    );

    server.tool(
      "get_forecast",
      "Get weather forecast for a location",
      {
        latitude: z.number().min(-90).max(90).describe("Latitude of the location"),
        longitude: z
          .number()
          .min(-180)
          .max(180)
          .describe("Longitude of the location"),
      },
      async ({ latitude, longitude }) => {
        // Get grid point data
        const pointsUrl = `${NWS_API_BASE}/points/${latitude.toFixed(4)},${longitude.toFixed(4)}`;
        const pointsData = await makeNWSRequest<PointsResponse>(pointsUrl);

        if (!pointsData) {
          return {
            content: [
              {
                type: "text",
                text: `Failed to retrieve grid point data for coordinates: ${latitude}, ${longitude}. This location may not be supported by the NWS API (only US locations are supported).`,
              },
            ],
          };
        }

        const forecastUrl = pointsData.properties?.forecast;
        if (!forecastUrl) {
          return {
            content: [
              {
                type: "text",
                text: "Failed to get forecast URL from grid point data",
              },
            ],
          };
        }

        // Get forecast data
        const forecastData = await makeNWSRequest<ForecastResponse>(forecastUrl);
        if (!forecastData) {
          return {
            content: [
              {
                type: "text",
                text: "Failed to retrieve forecast data",
              },
            ],
          };
        }

        const periods = forecastData.properties?.periods || [];
        if (periods.length === 0) {
          return {
            content: [
              {
                type: "text",
                text: "No forecast periods available",
              },
            ],
          };
        }

        // Format forecast periods
        const formattedForecast = periods.map((period: ForecastPeriod) =>
          [
            `${period.name || "Unknown"}:`,
            `Temperature: ${period.temperature || "Unknown"}°${period.temperatureUnit || "F"}`,
            `Wind: ${period.windSpeed || "Unknown"} ${period.windDirection || ""}`,
            `${period.shortForecast || "No forecast available"}`,
            "---",
          ].join("\n"),
        );

        const forecastText = `Forecast for ${latitude}, ${longitude}:\n\n${formattedForecast.join("\n")}`;

        return {
          content: [
            {
              type: "text",
              text: forecastText,
            },
          ],
        };
      },
    );
    ```

    ### Running the server

    Finally, implement the main function to run the server:

    ```typescript
    async function main() {
      const transport = new StdioServerTransport();
      await server.connect(transport);
      console.error("Weather MCP Server running on stdio");
    }

    main().catch((error) => {
      console.error("Fatal error in main():", error);
      process.exit(1);
    });
    ```

    Make sure to run `npm run build` to build your server! This is a very important step in getting your server to connect.

    Let's now test your server from an existing MCP host, Claude for Desktop.

    ## Testing your server with Claude for Desktop

    <Note>
      Claude for Desktop is not yet available on Linux. Linux users can proceed to the [Building a client](/docs/develop/build-client) tutorial to build an MCP client that connects to the server we just built.
    </Note>

    First, make sure you have Claude for Desktop installed. [You can install the latest version
    here.](https://claude.ai/download) If you already have Claude for Desktop, **make sure it's updated to the latest version.**

    We'll need to configure Claude for Desktop for whichever MCP servers you want to use. To do this, open your Claude for Desktop App configuration at `~/Library/Application Support/Claude/claude_desktop_config.json` in a text editor. Make sure to create the file if it doesn't exist.

    For example, if you have [VS Code](https://code.visualstudio.com/) installed:

    <CodeGroup>
      ```bash macOS/Linux
      code ~/Library/Application\ Support/Claude/claude_desktop_config.json
      ```

      ```powershell Windows
      code $env:AppData\Claude\claude_desktop_config.json
      ```
    </CodeGroup>

    You'll then add your servers in the `mcpServers` key. The MCP UI elements will only show up in Claude for Desktop if at least one server is properly configured.

    In this case, we'll add our single weather server like so:

    <CodeGroup>
      ```json macOS/Linux
      {
        "mcpServers": {
          "weather": {
            "command": "node",
            "args": ["/ABSOLUTE/PATH/TO/PARENT/FOLDER/weather/build/index.js"]
          }
        }
      }
      ```

      ```json Windows
      {
        "mcpServers": {
          "weather": {
            "command": "node",
            "args": ["C:\\PATH\\TO\\PARENT\\FOLDER\\weather\\build\\index.js"]
          }
        }
      }
      ```
    </CodeGroup>

    This tells Claude for Desktop:

    1. There's an MCP server named "weather"
    2. Launch it by running `node /ABSOLUTE/PATH/TO/PARENT/FOLDER/weather/build/index.js`

    Save the file, and restart **Claude for Desktop**.
  </Tab>

  <Tab title="Java">
    <Note>
      This is a quickstart demo based on Spring AI MCP auto-configuration and boot starters.
      To learn how to create sync and async MCP Servers, manually, consult the [Java SDK Server](/sdk/java/mcp-server) documentation.
    </Note>

    Let's get started with building our weather server!
    [You can find the complete code for what we'll be building here.](https://github.com/spring-projects/spring-ai-examples/tree/main/model-context-protocol/weather/starter-stdio-server)

    For more information, see the [MCP Server Boot Starter](https://docs.spring.io/spring-ai/reference/api/mcp/mcp-server-boot-starter-docs.html) reference documentation.
    For manual MCP Server implementation, refer to the [MCP Server Java SDK documentation](/sdk/java/mcp-server).

    ### Logging in MCP Servers

    When implementing MCP servers, be careful about how you handle logging:

    **For STDIO-based servers:** Never write to standard output (stdout). This includes:

    * `print()` statements in Python
    * `console.log()` in JavaScript
    * `fmt.Println()` in Go
    * Similar stdout functions in other languages

    Writing to stdout will corrupt the JSON-RPC messages and break your server.

    **For HTTP-based servers:** Standard output logging is fine since it doesn't interfere with HTTP responses.

    ### Best Practices

    1. Use a logging library that writes to stderr or files.
    2. Ensure any configured logging library will not write to STDOUT

    ### System requirements

    * Java 17 or higher installed.
    * [Spring Boot 3.3.x](https://docs.spring.io/spring-boot/installing.html) or higher

    ### Set up your environment

    Use the [Spring Initializer](https://start.spring.io/) to bootstrap the project.

    You will need to add the following dependencies:

    <CodeGroup>
      ```xml Maven
      <dependencies>
            <dependency>
                <groupId>org.springframework.ai</groupId>
                <artifactId>spring-ai-starter-mcp-server</artifactId>
            </dependency>

            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
            </dependency>
      </dependencies>
      ```

      ```groovy Gradle
      dependencies {
        implementation platform("org.springframework.ai:spring-ai-starter-mcp-server")
        implementation platform("org.springframework:spring-web")
      }
      ```
    </CodeGroup>

    Then configure your application by setting the application properties:

    <CodeGroup>
      ```bash application.properties
      spring.main.bannerMode=off
      logging.pattern.console=
      ```

      ```yaml application.yml
      logging:
        pattern:
          console:
      spring:
        main:
          banner-mode: off
      ```
    </CodeGroup>

    The [Server Configuration Properties](https://docs.spring.io/spring-ai/reference/api/mcp/mcp-server-boot-starter-docs.html#_configuration_properties) documents all available properties.

    Now let's dive into building your server.

    ## Building your server

    ### Weather Service

    Let's implement a [WeatherService.java](https://github.com/spring-projects/spring-ai-examples/blob/main/model-context-protocol/weather/starter-stdio-server/src/main/java/org/springframework/ai/mcp/sample/server/WeatherService.java) that uses a REST client to query the data from the National Weather Service API:

    ```java
    @Service
    public class WeatherService {

    	private final RestClient restClient;

    	public WeatherService() {
    		this.restClient = RestClient.builder()
    			.baseUrl("https://api.weather.gov")
    			.defaultHeader("Accept", "application/geo+json")
    			.defaultHeader("User-Agent", "WeatherApiClient/1.0 (your@email.com)")
    			.build();
    	}

      @Tool(description = "Get weather forecast for a specific latitude/longitude")
      public String getWeatherForecastByLocation(
          double latitude,   // Latitude coordinate
          double longitude   // Longitude coordinate
      ) {
          // Returns detailed forecast including:
          // - Temperature and unit
          // - Wind speed and direction
          // - Detailed forecast description
      }

      @Tool(description = "Get weather alerts for a US state")
      public String getAlerts(
          @ToolParam(description = "Two-letter US state code (e.g. CA, NY)") String state
      ) {
          // Returns active alerts including:
          // - Event type
          // - Affected area
          // - Severity
          // - Description
          // - Safety instructions
      }

      // ......
    }
    ```

    The `@Service` annotation with auto-register the service in your application context.
    The Spring AI `@Tool` annotation, making it easy to create and maintain MCP tools.

    The auto-configuration will automatically register these tools with the MCP server.

    ### Create your Boot Application

    ```java
    @SpringBootApplication
    public class McpServerApplication {

    	public static void main(String[] args) {
    		SpringApplication.run(McpServerApplication.class, args);
    	}

    	@Bean
    	public ToolCallbackProvider weatherTools(WeatherService weatherService) {
    		return  MethodToolCallbackProvider.builder().toolObjects(weatherService).build();
    	}
    }
    ```

    Uses the `MethodToolCallbackProvider` utils to convert the `@Tools` into actionable callbacks used by the MCP server.

    ### Running the server

    Finally, let's build the server:

    ```bash
    ./mvnw clean install
    ```

    This will generate a `mcp-weather-stdio-server-0.0.1-SNAPSHOT.jar` file within the `target` folder.

    Let's now test your server from an existing MCP host, Claude for Desktop.

    ## Testing your server with Claude for Desktop

    <Note>
      Claude for Desktop is not yet available on Linux.
    </Note>

    First, make sure you have Claude for Desktop installed.
    [You can install the latest version here.](https://claude.ai/download) If you already have Claude for Desktop, **make sure it's updated to the latest version.**

    We'll need to configure Claude for Desktop for whichever MCP servers you want to use.
    To do this, open your Claude for Desktop App configuration at `~/Library/Application Support/Claude/claude_desktop_config.json` in a text editor.
    Make sure to create the file if it doesn't exist.

    For example, if you have [VS Code](https://code.visualstudio.com/) installed:

    <CodeGroup>
      ```bash macOS/Linux
      code ~/Library/Application\ Support/Claude/claude_desktop_config.json
      ```

      ```powershell Windows
      code $env:AppData\Claude\claude_desktop_config.json
      ```
    </CodeGroup>

    You'll then add your servers in the `mcpServers` key.
    The MCP UI elements will only show up in Claude for Desktop if at least one server is properly configured.

    In this case, we'll add our single weather server like so:

    <CodeGroup>
      ```json macOS/Linux
      {
        "mcpServers": {
          "spring-ai-mcp-weather": {
            "command": "java",
            "args": [
              "-Dspring.ai.mcp.server.stdio=true",
              "-jar",
              "/ABSOLUTE/PATH/TO/PARENT/FOLDER/mcp-weather-stdio-server-0.0.1-SNAPSHOT.jar"
            ]
          }
        }
      }
      ```

      ```json Windows
      {
        "mcpServers": {
          "spring-ai-mcp-weather": {
            "command": "java",
            "args": [
              "-Dspring.ai.mcp.server.transport=STDIO",
              "-jar",
              "C:\\ABSOLUTE\\PATH\\TO\\PARENT\\FOLDER\\weather\\mcp-weather-stdio-server-0.0.1-SNAPSHOT.jar"
            ]
          }
        }
      }
      ```
    </CodeGroup>

    <Note>
      Make sure you pass in the absolute path to your server.
    </Note>

    This tells Claude for Desktop:

    1. There's an MCP server named "my-weather-server"
    2. To launch it by running `java -jar /ABSOLUTE/PATH/TO/PARENT/FOLDER/mcp-weather-stdio-server-0.0.1-SNAPSHOT.jar`

    Save the file, and restart **Claude for Desktop**.

    ## Testing your server with Java client

    ### Create an MCP Client manually

    Use the `McpClient` to connect to the server:

    ```java
    var stdioParams = ServerParameters.builder("java")
      .args("-jar", "/ABSOLUTE/PATH/TO/PARENT/FOLDER/mcp-weather-stdio-server-0.0.1-SNAPSHOT.jar")
      .build();

    var stdioTransport = new StdioClientTransport(stdioParams);

    var mcpClient = McpClient.sync(stdioTransport).build();

    mcpClient.initialize();

    ListToolsResult toolsList = mcpClient.listTools();

    CallToolResult weather = mcpClient.callTool(
      new CallToolRequest("getWeatherForecastByLocation",
          Map.of("latitude", "47.6062", "longitude", "-122.3321")));

    CallToolResult alert = mcpClient.callTool(
      new CallToolRequest("getAlerts", Map.of("state", "NY")));

    mcpClient.closeGracefully();
    ```

    ### Use MCP Client Boot Starter

    Create a new boot starter application using the `spring-ai-starter-mcp-client` dependency:

    ```xml
    <dependency>
        <groupId>org.springframework.ai</groupId>
        <artifactId>spring-ai-starter-mcp-client</artifactId>
    </dependency>
    ```

    and set the `spring.ai.mcp.client.stdio.servers-configuration` property to point to your `claude_desktop_config.json`.
    You can reuse the existing Anthropic Desktop configuration:

    ```properties
    spring.ai.mcp.client.stdio.servers-configuration=file:PATH/TO/claude_desktop_config.json
    ```

    When you start your client application, the auto-configuration will create, automatically MCP clients from the claude\_desktop\_config.json.

    For more information, see the [MCP Client Boot Starters](https://docs.spring.io/spring-ai/reference/api/mcp/mcp-server-boot-client-docs.html) reference documentation.

    ## More Java MCP Server examples

    The [starter-webflux-server](https://github.com/spring-projects/spring-ai-examples/tree/main/model-context-protocol/weather/starter-webflux-server) demonstrates how to create an MCP server using SSE transport.
    It showcases how to define and register MCP Tools, Resources, and Prompts, using the Spring Boot's auto-configuration capabilities.
  </Tab>

  <Tab title="Kotlin">
    Let's get started with building our weather server! [You can find the complete code for what we'll be building here.](https://github.com/modelcontextprotocol/kotlin-sdk/tree/main/samples/weather-stdio-server)

    ### Prerequisite knowledge

    This quickstart assumes you have familiarity with:

    * Kotlin
    * LLMs like Claude

    ### System requirements

    * Java 17 or higher installed.

    ### Set up your environment

    First, let's install `java` and `gradle` if you haven't already.
    You can download `java` from [official Oracle JDK website](https://www.oracle.com/java/technologies/downloads/).
    Verify your `java` installation:

    ```bash
    java --version
    ```

    Now, let's create and set up your project:

    <CodeGroup>
      ```bash macOS/Linux
      # Create a new directory for our project
      mkdir weather
      cd weather

      # Initialize a new kotlin project
      gradle init
      ```

      ```powershell Windows
      # Create a new directory for our project
      md weather
      cd weather

      # Initialize a new kotlin project
      gradle init
      ```
    </CodeGroup>

    After running `gradle init`, you will be presented with options for creating your project.
    Select **Application** as the project type, **Kotlin** as the programming language, and **Java 17** as the Java version.

    Alternatively, you can create a Kotlin application using the [IntelliJ IDEA project wizard](https://kotlinlang.org/docs/jvm-get-started.html).

    After creating the project, add the following dependencies:

    <CodeGroup>
      ```kotlin build.gradle.kts
      val mcpVersion = "0.4.0"
      val slf4jVersion = "2.0.9"
      val ktorVersion = "3.1.1"

      dependencies {
          implementation("io.modelcontextprotocol:kotlin-sdk:$mcpVersion")
          implementation("org.slf4j:slf4j-nop:$slf4jVersion")
          implementation("io.ktor:ktor-client-content-negotiation:$ktorVersion")
          implementation("io.ktor:ktor-serialization-kotlinx-json:$ktorVersion")
      }
      ```

      ```groovy build.gradle
      def mcpVersion = '0.3.0'
      def slf4jVersion = '2.0.9'
      def ktorVersion = '3.1.1'

      dependencies {
          implementation "io.modelcontextprotocol:kotlin-sdk:$mcpVersion"
          implementation "org.slf4j:slf4j-nop:$slf4jVersion"
          implementation "io.ktor:ktor-client-content-negotiation:$ktorVersion"
          implementation "io.ktor:ktor-serialization-kotlinx-json:$ktorVersion"
      }
      ```
    </CodeGroup>

    Also, add the following plugins to your build script:

    <CodeGroup>
      ```kotlin build.gradle.kts
      plugins {
          kotlin("plugin.serialization") version "your_version_of_kotlin"
          id("com.github.johnrengelman.shadow") version "8.1.1"
      }
      ```

      ```groovy build.gradle
      plugins {
          id 'org.jetbrains.kotlin.plugin.serialization' version 'your_version_of_kotlin'
          id 'com.github.johnrengelman.shadow' version '8.1.1'
      }
      ```
    </CodeGroup>

    Now let’s dive into building your server.

    ## Building your server

    ### Setting up the instance

    Add a server initialization function:

    ```kotlin
    // Main function to run the MCP server
    fun `run mcp server`() {
        // Create the MCP Server instance with a basic implementation
        val server = Server(
            Implementation(
                name = "weather", // Tool name is "weather"
                version = "1.0.0" // Version of the implementation
            ),
            ServerOptions(
                capabilities = ServerCapabilities(tools = ServerCapabilities.Tools(listChanged = true))
            )
        )

        // Create a transport using standard IO for server communication
        val transport = StdioServerTransport(
            System.`in`.asInput(),
            System.out.asSink().buffered()
        )

        runBlocking {
            server.connect(transport)
            val done = Job()
            server.onClose {
                done.complete()
            }
            done.join()
        }
    }
    ```

    ### Weather API helper functions

    Next, let's add functions and data classes for querying and converting responses from the National Weather Service API:

    ```kotlin
    // Extension function to fetch forecast information for given latitude and longitude
    suspend fun HttpClient.getForecast(latitude: Double, longitude: Double): List<String> {
        val points = this.get("/points/$latitude,$longitude").body<Points>()
        val forecast = this.get(points.properties.forecast).body<Forecast>()
        return forecast.properties.periods.map { period ->
            """
                ${period.name}:
                Temperature: ${period.temperature} ${period.temperatureUnit}
                Wind: ${period.windSpeed} ${period.windDirection}
                Forecast: ${period.detailedForecast}
            """.trimIndent()
        }
    }

    // Extension function to fetch weather alerts for a given state
    suspend fun HttpClient.getAlerts(state: String): List<String> {
        val alerts = this.get("/alerts/active/area/$state").body<Alert>()
        return alerts.features.map { feature ->
            """
                Event: ${feature.properties.event}
                Area: ${feature.properties.areaDesc}
                Severity: ${feature.properties.severity}
                Description: ${feature.properties.description}
                Instruction: ${feature.properties.instruction}
            """.trimIndent()
        }
    }

    @Serializable
    data class Points(
        val properties: Properties
    ) {
        @Serializable
        data class Properties(val forecast: String)
    }

    @Serializable
    data class Forecast(
        val properties: Properties
    ) {
        @Serializable
        data class Properties(val periods: List<Period>)

        @Serializable
        data class Period(
            val number: Int, val name: String, val startTime: String, val endTime: String,
            val isDaytime: Boolean, val temperature: Int, val temperatureUnit: String,
            val temperatureTrend: String, val probabilityOfPrecipitation: JsonObject,
            val windSpeed: String, val windDirection: String,
            val shortForecast: String, val detailedForecast: String,
        )
    }

    @Serializable
    data class Alert(
        val features: List<Feature>
    ) {
        @Serializable
        data class Feature(
            val properties: Properties
        )

        @Serializable
        data class Properties(
            val event: String, val areaDesc: String, val severity: String,
            val description: String, val instruction: String?,
        )
    }
    ```

    ### Implementing tool execution

    The tool execution handler is responsible for actually executing the logic of each tool. Let's add it:

    ```kotlin
    // Create an HTTP client with a default request configuration and JSON content negotiation
    val httpClient = HttpClient {
        defaultRequest {
            url("https://api.weather.gov")
            headers {
                append("Accept", "application/geo+json")
                append("User-Agent", "WeatherApiClient/1.0")
            }
            contentType(ContentType.Application.Json)
        }
        // Install content negotiation plugin for JSON serialization/deserialization
        install(ContentNegotiation) { json(Json { ignoreUnknownKeys = true }) }
    }

    // Register a tool to fetch weather alerts by state
    server.addTool(
        name = "get_alerts",
        description = """
            Get weather alerts for a US state. Input is Two-letter US state code (e.g. CA, NY)
        """.trimIndent(),
        inputSchema = Tool.Input(
            properties = buildJsonObject {
                putJsonObject("state") {
                    put("type", "string")
                    put("description", "Two-letter US state code (e.g. CA, NY)")
                }
            },
            required = listOf("state")
        )
    ) { request ->
        val state = request.arguments["state"]?.jsonPrimitive?.content
        if (state == null) {
            return@addTool CallToolResult(
                content = listOf(TextContent("The 'state' parameter is required."))
            )
        }

        val alerts = httpClient.getAlerts(state)

        CallToolResult(content = alerts.map { TextContent(it) })
    }

    // Register a tool to fetch weather forecast by latitude and longitude
    server.addTool(
        name = "get_forecast",
        description = """
            Get weather forecast for a specific latitude/longitude
        """.trimIndent(),
        inputSchema = Tool.Input(
            properties = buildJsonObject {
                putJsonObject("latitude") { put("type", "number") }
                putJsonObject("longitude") { put("type", "number") }
            },
            required = listOf("latitude", "longitude")
        )
    ) { request ->
        val latitude = request.arguments["latitude"]?.jsonPrimitive?.doubleOrNull
        val longitude = request.arguments["longitude"]?.jsonPrimitive?.doubleOrNull
        if (latitude == null || longitude == null) {
            return@addTool CallToolResult(
                content = listOf(TextContent("The 'latitude' and 'longitude' parameters are required."))
            )
        }

        val forecast = httpClient.getForecast(latitude, longitude)

        CallToolResult(content = forecast.map { TextContent(it) })
    }
    ```

    ### Running the server

    Finally, implement the main function to run the server:

    ```kotlin
    fun main() = `run mcp server`()
    ```

    Make sure to run `./gradlew build` to build your server. This is a very important step in getting your server to connect.

    Let's now test your server from an existing MCP host, Claude for Desktop.

    ## Testing your server with Claude for Desktop

    <Note>
      Claude for Desktop is not yet available on Linux. Linux users can proceed to the [Building a client](/docs/develop/build-client) tutorial to build an MCP client that connects to the server we just built.
    </Note>

    First, make sure you have Claude for Desktop installed. [You can install the latest version
    here.](https://claude.ai/download) If you already have Claude for Desktop, **make sure it's updated to the latest version.**

    We'll need to configure Claude for Desktop for whichever MCP servers you want to use.
    To do this, open your Claude for Desktop App configuration at `~/Library/Application Support/Claude/claude_desktop_config.json` in a text editor.
    Make sure to create the file if it doesn't exist.

    For example, if you have [VS Code](https://code.visualstudio.com/) installed:

    <CodeGroup>
      ```bash macOS/Linux
      code ~/Library/Application\ Support/Claude/claude_desktop_config.json
      ```

      ```powershell Windows
      code $env:AppData\Claude\claude_desktop_config.json
      ```
    </CodeGroup>

    You'll then add your servers in the `mcpServers` key.
    The MCP UI elements will only show up in Claude for Desktop if at least one server is properly configured.

    In this case, we'll add our single weather server like so:

    <CodeGroup>
      ```json macOS/Linux
      {
        "mcpServers": {
          "weather": {
            "command": "java",
            "args": [
              "-jar",
              "/ABSOLUTE/PATH/TO/PARENT/FOLDER/weather/build/libs/weather-0.1.0-all.jar"
            ]
          }
        }
      }
      ```

      ```json Windows
      {
        "mcpServers": {
          "weather": {
            "command": "java",
            "args": [
              "-jar",
              "C:\\PATH\\TO\\PARENT\\FOLDER\\weather\\build\\libs\\weather-0.1.0-all.jar"
            ]
          }
        }
      }
      ```
    </CodeGroup>

    This tells Claude for Desktop:

    1. There's an MCP server named "weather"
    2. Launch it by running `java -jar /ABSOLUTE/PATH/TO/PARENT/FOLDER/weather/build/libs/weather-0.1.0-all.jar`

    Save the file, and restart **Claude for Desktop**.
  </Tab>

  <Tab title="C#">
    Let's get started with building our weather server! [You can find the complete code for what we'll be building here.](https://github.com/modelcontextprotocol/csharp-sdk/tree/main/samples/QuickstartWeatherServer)

    ### Prerequisite knowledge

    This quickstart assumes you have familiarity with:

    * C#
    * LLMs like Claude
    * .NET 8 or higher

    ### Logging in MCP Servers

    When implementing MCP servers, be careful about how you handle logging:

    **For STDIO-based servers:** Never write to standard output (stdout). This includes:

    * `print()` statements in Python
    * `console.log()` in JavaScript
    * `fmt.Println()` in Go
    * Similar stdout functions in other languages

    Writing to stdout will corrupt the JSON-RPC messages and break your server.

    **For HTTP-based servers:** Standard output logging is fine since it doesn't interfere with HTTP responses.

    ### Best Practices

    1. Use a logging library that writes to stderr or files

    ### System requirements

    * [.NET 8 SDK](https://dotnet.microsoft.com/download/dotnet/8.0) or higher installed.

    ### Set up your environment

    First, let's install `dotnet` if you haven't already. You can download `dotnet` from [official Microsoft .NET website](https://dotnet.microsoft.com/download/). Verify your `dotnet` installation:

    ```bash
    dotnet --version
    ```

    Now, let's create and set up your project:

    <CodeGroup>
      ```bash macOS/Linux
      # Create a new directory for our project
      mkdir weather
      cd weather
      # Initialize a new C# project
      dotnet new console
      ```

      ```powershell Windows
      # Create a new directory for our project
      mkdir weather
      cd weather
      # Initialize a new C# project
      dotnet new console
      ```
    </CodeGroup>

    After running `dotnet new console`, you will be presented with a new C# project.
    You can open the project in your favorite IDE, such as [Visual Studio](https://visualstudio.microsoft.com/) or [Rider](https://www.jetbrains.com/rider/).
    Alternatively, you can create a C# application using the [Visual Studio project wizard](https://learn.microsoft.com/en-us/visualstudio/get-started/csharp/tutorial-console?view=vs-2022).
    After creating the project, add NuGet package for the Model Context Protocol SDK and hosting:

    ```bash
    # Add the Model Context Protocol SDK NuGet package
    dotnet add package ModelContextProtocol --prerelease
    # Add the .NET Hosting NuGet package
    dotnet add package Microsoft.Extensions.Hosting
    ```

    Now let’s dive into building your server.

    ## Building your server

    Open the `Program.cs` file in your project and replace its contents with the following code:

    ```csharp
    using Microsoft.Extensions.DependencyInjection;
    using Microsoft.Extensions.Hosting;
    using ModelContextProtocol;
    using System.Net.Http.Headers;

    var builder = Host.CreateEmptyApplicationBuilder(settings: null);

    builder.Services.AddMcpServer()
        .WithStdioServerTransport()
        .WithToolsFromAssembly();

    builder.Services.AddSingleton(_ =>
    {
        var client = new HttpClient() { BaseAddress = new Uri("https://api.weather.gov") };
        client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("weather-tool", "1.0"));
        return client;
    });

    var app = builder.Build();

    await app.RunAsync();
    ```

    <Note>
      When creating the `ApplicationHostBuilder`, ensure you use `CreateEmptyApplicationBuilder` instead of `CreateDefaultBuilder`. This ensures that the server does not write any additional messages to the console. This is only necessary for servers using STDIO transport.
    </Note>

    This code sets up a basic console application that uses the Model Context Protocol SDK to create an MCP server with standard I/O transport.

    ### Weather API helper functions

    Create an extension class for `HttpClient` which helps simplify JSON request handling:

    ```csharp
    using System.Text.Json;

    internal static class HttpClientExt
    {
        public static async Task<JsonDocument> ReadJsonDocumentAsync(this HttpClient client, string requestUri)
        {
            using var response = await client.GetAsync(requestUri);
            response.EnsureSuccessStatusCode();
            return await JsonDocument.ParseAsync(await response.Content.ReadAsStreamAsync());
        }
    }
    ```

    Next, define a class with the tool execution handlers for querying and converting responses from the National Weather Service API:

    ```csharp
    using ModelContextProtocol.Server;
    using System.ComponentModel;
    using System.Globalization;
    using System.Text.Json;

    namespace QuickstartWeatherServer.Tools;

    [McpServerToolType]
    public static class WeatherTools
    {
        [McpServerTool, Description("Get weather alerts for a US state.")]
        public static async Task<string> GetAlerts(
            HttpClient client,
            [Description("The US state to get alerts for.")] string state)
        {
            using var jsonDocument = await client.ReadJsonDocumentAsync($"/alerts/active/area/{state}");
            var jsonElement = jsonDocument.RootElement;
            var alerts = jsonElement.GetProperty("features").EnumerateArray();

            if (!alerts.Any())
            {
                return "No active alerts for this state.";
            }

            return string.Join("\n--\n", alerts.Select(alert =>
            {
                JsonElement properties = alert.GetProperty("properties");
                return $"""
                        Event: {properties.GetProperty("event").GetString()}
                        Area: {properties.GetProperty("areaDesc").GetString()}
                        Severity: {properties.GetProperty("severity").GetString()}
                        Description: {properties.GetProperty("description").GetString()}
                        Instruction: {properties.GetProperty("instruction").GetString()}
                        """;
            }));
        }

        [McpServerTool, Description("Get weather forecast for a location.")]
        public static async Task<string> GetForecast(
            HttpClient client,
            [Description("Latitude of the location.")] double latitude,
            [Description("Longitude of the location.")] double longitude)
        {
            var pointUrl = string.Create(CultureInfo.InvariantCulture, $"/points/{latitude},{longitude}");
            using var jsonDocument = await client.ReadJsonDocumentAsync(pointUrl);
            var forecastUrl = jsonDocument.RootElement.GetProperty("properties").GetProperty("forecast").GetString()
                ?? throw new Exception($"No forecast URL provided by {client.BaseAddress}points/{latitude},{longitude}");

            using var forecastDocument = await client.ReadJsonDocumentAsync(forecastUrl);
            var periods = forecastDocument.RootElement.GetProperty("properties").GetProperty("periods").EnumerateArray();

            return string.Join("\n---\n", periods.Select(period => $"""
                    {period.GetProperty("name").GetString()}
                    Temperature: {period.GetProperty("temperature").GetInt32()}°F
                    Wind: {period.GetProperty("windSpeed").GetString()} {period.GetProperty("windDirection").GetString()}
                    Forecast: {period.GetProperty("detailedForecast").GetString()}
                    """));
        }
    }
    ```

    ### Running the server

    Finally, run the server using the following command:

    ```bash
    dotnet run
    ```

    This will start the server and listen for incoming requests on standard input/output.

    ## Testing your server with Claude for Desktop

    <Note>
      Claude for Desktop is not yet available on Linux. Linux users can proceed to the [Building a client](/docs/develop/build-client) tutorial to build an MCP client that connects to the server we just built.
    </Note>

    First, make sure you have Claude for Desktop installed. [You can install the latest version
    here.](https://claude.ai/download) If you already have Claude for Desktop, **make sure it's updated to the latest version.**
    We'll need to configure Claude for Desktop for whichever MCP servers you want to use. To do this, open your Claude for Desktop App configuration at `~/Library/Application Support/Claude/claude_desktop_config.json` in a text editor. Make sure to create the file if it doesn't exist.
    For example, if you have [VS Code](https://code.visualstudio.com/) installed:

    <CodeGroup>
      ```bash macOS/Linux
      code ~/Library/Application\ Support/Claude/claude_desktop_config.json
      ```

      ```powershell Windows
      code $env:AppData\Claude\claude_desktop_config.json
      ```
    </CodeGroup>

    You'll then add your servers in the `mcpServers` key. The MCP UI elements will only show up in Claude for Desktop if at least one server is properly configured.
    In this case, we'll add our single weather server like so:

    <CodeGroup>
      ```json macOS/Linux
      {
        "mcpServers": {
          "weather": {
            "command": "dotnet",
            "args": ["run", "--project", "/ABSOLUTE/PATH/TO/PROJECT", "--no-build"]
          }
        }
      }
      ```

      ```json Windows
      {
        "mcpServers": {
          "weather": {
            "command": "dotnet",
            "args": [
              "run",
              "--project",
              "C:\\ABSOLUTE\\PATH\\TO\\PROJECT",
              "--no-build"
            ]
          }
        }
      }
      ```
    </CodeGroup>

    This tells Claude for Desktop:

    1. There's an MCP server named "weather"
    2. Launch it by running `dotnet run /ABSOLUTE/PATH/TO/PROJECT`
       Save the file, and restart **Claude for Desktop**.
  </Tab>
</Tabs>

### Test with commands

Let's make sure Claude for Desktop is picking up the two tools we've exposed in our `weather` server. You can do this by looking for the "Search and tools" <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=2742ec3fb97067e8591e68546c90221e" style={{display: 'inline', margin: 0, height: '1.3em'}} data-og-width="24" width="24" data-og-height="24" height="24" data-path="images/claude-desktop-mcp-slider.svg" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=52839f8519f476623c4fb5bb87ee24bd 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=f0491976e108286441fc6554309c5c4f 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=08e83eb102eda755a7db1eb27d16ebff 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=2524a80752928b0206e68e8e1890d1aa 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=3c0dc88dadad5ed8e8af316965d00e0b 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=702363a955a631c40c342f9557d5cfdd 2500w" data-optimize="true" data-opv="2" /> icon:

<Frame>
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/visual-indicator-mcp-tools.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=dee15f1044586f26f7c8f489d1b1bea1" data-og-width="2250" width="2250" data-og-height="462" height="462" data-path="images/visual-indicator-mcp-tools.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/visual-indicator-mcp-tools.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7d5a49e662150224cacc011f27310bd0 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/visual-indicator-mcp-tools.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=8f4d36114ab38529374b8ed651bec92d 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/visual-indicator-mcp-tools.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=6e0145760586e28c8d45e11424653912 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/visual-indicator-mcp-tools.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=17d958bc6c8ac8260c2b18d5e6e033bb 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/visual-indicator-mcp-tools.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0bdb3a92e0e7721921d77288c5594fd4 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/visual-indicator-mcp-tools.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=5eabd994c742cc7379e99b908e9dea3e 2500w" data-optimize="true" data-opv="2" />
</Frame>

After clicking on the slider icon, you should see two tools listed:

<Frame>
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/available-mcp-tools.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=040f7b6ec62f24b8fa0aaf4c5cab2d29" data-og-width="638" width="638" data-og-height="240" height="240" data-path="images/available-mcp-tools.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/available-mcp-tools.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=588fae5b4ba6c310a527e91eb20d83bf 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/available-mcp-tools.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=d277a424f541ff9a901072a4103ff05e 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/available-mcp-tools.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=d12c286d06565cd45e175ea08c59fcf4 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/available-mcp-tools.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=e30982d8fea169d8559777facd1a07e3 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/available-mcp-tools.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=d90eaa83029d8ae66dec21d632c118b5 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/available-mcp-tools.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=f89e9bb7244323d208cf367bcd45f4ef 2500w" data-optimize="true" data-opv="2" />
</Frame>

If your server isn't being picked up by Claude for Desktop, proceed to the [Troubleshooting](#troubleshooting) section for debugging tips.

If the tool settings icon has shown up, you can now test your server by running the following commands in Claude for Desktop:

* What's the weather in Sacramento?
* What are the active weather alerts in Texas?

<Frame>
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=dce7b2f8a06c20ba358e4bd2e75fa4c7" data-og-width="2780" width="2780" data-og-height="1849" height="1849" data-path="images/current-weather.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=bbb19f34c5df59f66bc6bbb75d2bc5ed 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=2392d7e765b897c5b78f9f53d41439d4 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=dc349e75341b046d35a649762774da49 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=deeb99214d9383ee4a0c8aaacb120049 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=5c6f948059635e376deeadce3893e9b9 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/current-weather.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=3922160478785cc88d5e98d418e8f7dd 2500w" data-optimize="true" data-opv="2" />
</Frame>

<Frame>
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/weather-alerts.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c4762bf2bd84a8781846d2965af3e4a4" data-og-width="2809" width="2809" data-og-height="1850" height="1850" data-path="images/weather-alerts.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/weather-alerts.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=e25afdd84f6ae9c612b898c6eb9c518d 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/weather-alerts.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=1e7ef678cbc93c0966789e61d5209092 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/weather-alerts.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=4dbaeb8840a7b1aeb73b188804877d71 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/weather-alerts.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=68f5e0cb428c8b9cb53d28ec1108073b 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/weather-alerts.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=56025243c2b8c6413f8da087122e848d 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/weather-alerts.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=12f50039e4a1c9544a22a9bdae46f719 2500w" data-optimize="true" data-opv="2" />
</Frame>

<Note>
  Since this is the US National Weather service, the queries will only work for US locations.
</Note>

## What's happening under the hood

When you ask a question:

1. The client sends your question to Claude
2. Claude analyzes the available tools and decides which one(s) to use
3. The client executes the chosen tool(s) through the MCP server
4. The results are sent back to Claude
5. Claude formulates a natural language response
6. The response is displayed to you!

## Troubleshooting

<AccordionGroup>
  <Accordion title="Claude for Desktop Integration Issues">
    **Getting logs from Claude for Desktop**

    Claude.app logging related to MCP is written to log files in `~/Library/Logs/Claude`:

    * `mcp.log` will contain general logging about MCP connections and connection failures.
    * Files named `mcp-server-SERVERNAME.log` will contain error (stderr) logging from the named server.

    You can run the following command to list recent logs and follow along with any new ones:

    ```bash
    # Check Claude's logs for errors
    tail -n 20 -f ~/Library/Logs/Claude/mcp*.log
    ```

    **Server not showing up in Claude**

    1. Check your `claude_desktop_config.json` file syntax
    2. Make sure the path to your project is absolute and not relative
    3. Restart Claude for Desktop completely

    **Tool calls failing silently**

    If Claude attempts to use the tools but they fail:

    1. Check Claude's logs for errors
    2. Verify your server builds and runs without errors
    3. Try restarting Claude for Desktop

    **None of this is working. What do I do?**

    Please refer to our [debugging guide](/legacy/tools/debugging) for better debugging tools and more detailed guidance.
  </Accordion>

  <Accordion title="Weather API Issues">
    **Error: Failed to retrieve grid point data**

    This usually means either:

    1. The coordinates are outside the US
    2. The NWS API is having issues
    3. You're being rate limited

    Fix:

    * Verify you're using US coordinates
    * Add a small delay between requests
    * Check the NWS API status page

    **Error: No active alerts for \[STATE]**

    This isn't an error - it just means there are no current weather alerts for that state. Try a different state or check during severe weather.
  </Accordion>
</AccordionGroup>

<Note>
  For more advanced troubleshooting, check out our guide on [Debugging MCP](/legacy/tools/debugging)
</Note>

## Next steps

<CardGroup cols={2}>
  <Card title="Building a client" icon="outlet" href="/docs/develop/build-client">
    Learn how to build your own MCP client that can connect to your server
  </Card>

  <Card title="Example servers" icon="grid" href="/examples">
    Check out our gallery of official MCP servers and implementations
  </Card>

  <Card title="Debugging Guide" icon="bug" href="/legacy/tools/debugging">
    Learn how to effectively debug MCP servers and integrations
  </Card>

  <Card title="Building MCP with LLMs" icon="comments" href="/tutorials/building-mcp-with-llms">
    Learn how to use LLMs like Claude to speed up your MCP development
  </Card>
</CardGroup>


# Connect to local MCP servers
Source: https://modelcontextprotocol.io/docs/develop/connect-local-servers

Learn how to extend Claude Desktop with local MCP servers to enable file system access and other powerful integrations

Model Context Protocol (MCP) servers extend AI applications' capabilities by providing secure, controlled access to local resources and tools. Many clients support MCP, enabling diverse integration possibilities across different platforms and applications.

This guide demonstrates how to connect to local MCP servers using Claude Desktop as an example, one of the [many clients that support MCP](/clients). While we focus on Claude Desktop's implementation, the concepts apply broadly to other MCP-compatible clients. By the end of this tutorial, Claude will be able to interact with files on your computer, create new documents, organize folders, and search through your file system—all with your explicit permission for each action.

<Frame>
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=629d7e754dc358d71a408d6ce970c1b1" alt="Claude Desktop with filesystem integration showing file management capabilities" data-og-width="1732" width="1732" data-og-height="2060" height="2060" data-path="images/quickstart-filesystem.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0758ee60aee8acc3035727957612351f 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=3bc6d3ea4a3cd38b6d031ac386700c62 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=9d75e8729b08b452f2e0d08bff8ce393 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=b35c6b531daa84b4ba4b06c9223b1ee2 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c4bb491d17a65e038120b5c39031ab7f 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-filesystem.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=ea7a0ad5ae5eeb866222f4020dc7bba3 2500w" data-optimize="true" data-opv="2" />
</Frame>

## Prerequisites

Before starting this tutorial, ensure you have the following installed on your system:

### Claude Desktop

Download and install [Claude Desktop](https://claude.ai/download) for your operating system. Claude Desktop is currently available for macOS and Windows. Linux support is coming soon.

If you already have Claude Desktop installed, verify you're running the latest version by clicking the Claude menu and selecting "Check for Updates..."

### Node.js

The Filesystem Server and many other MCP servers require Node.js to run. Verify your Node.js installation by opening a terminal or command prompt and running:

```bash
node --version
```

If Node.js is not installed, download it from [nodejs.org](https://nodejs.org/). We recommend the LTS (Long Term Support) version for stability.

## Understanding MCP Servers

MCP servers are programs that run on your computer and provide specific capabilities to Claude Desktop through a standardized protocol. Each server exposes tools that Claude can use to perform actions, with your approval. The Filesystem Server we'll install provides tools for:

* Reading file contents and directory structures
* Creating new files and directories
* Moving and renaming files
* Searching for files by name or content

All actions require your explicit approval before execution, ensuring you maintain full control over what Claude can access and modify.

## Installing the Filesystem Server

The process involves configuring Claude Desktop to automatically start the Filesystem Server whenever you launch the application. This configuration is done through a JSON file that tells Claude Desktop which servers to run and how to connect to them.

<Steps>
  <Step title="Open Claude Desktop Settings">
    Start by accessing the Claude Desktop settings. Click on the Claude menu in your system's menu bar (not the settings within the Claude window itself) and select "Settings..."

    On macOS, this appears in the top menu bar:

    <Frame style={{ textAlign: "center" }}>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-menu.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0c8b57e0e17af3624b6762a3ea944c8e" width="400" alt="Claude Desktop menu showing Settings option" data-og-width="644" data-og-height="568" data-path="images/quickstart-menu.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-menu.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=f997b6f31398840d3a824fa0eb9fec43 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-menu.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=062b0b3c342e4e02a8f2d690a48bcb24 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-menu.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=ae9b08052b7ea30b31d27432d8edf19e 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-menu.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7962cc4fb841fa0a04a3c6de03cf4d3d 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-menu.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=86bd79431e35b133d0ae4f74265f3d60 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-menu.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=1b300ae527efb4744aa08d5df94299a0 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    This opens the Claude Desktop configuration window, which is separate from your Claude account settings.
  </Step>

  <Step title="Access Developer Settings">
    In the Settings window, navigate to the "Developer" tab in the left sidebar. This section contains options for configuring MCP servers and other developer features.

    Click the "Edit Config" button to open the configuration file:

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-developer.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0fb595490a2f9e15c0301e771a57446c" alt="Developer settings showing Edit Config button" data-og-width="1688" width="1688" data-og-height="534" height="534" data-path="images/quickstart-developer.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-developer.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0a7e615ee50a27a4e514668f7cbd9f57 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-developer.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=16d6d4721219afd7e2bfa41f0795e7e0 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-developer.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=612b1de5516ed7321d5b6939b5b3c823 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-developer.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=840a428450dc0ec97538eb4e05050bcd 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-developer.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=59ae3a95918ff7f7b15e777c2d606496 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-developer.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7838d7f023a281053786870336914f03 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    This action creates a new configuration file if one doesn't exist, or opens your existing configuration. The file is located at:

    * **macOS**: `~/Library/Application Support/Claude/claude_desktop_config.json`
    * **Windows**: `%APPDATA%\Claude\claude_desktop_config.json`
  </Step>

  <Step title="Configure the Filesystem Server">
    Replace the contents of the configuration file with the following JSON structure. This configuration tells Claude Desktop to start the Filesystem Server with access to specific directories:

    <CodeGroup>
      ```json macOS
      {
        "mcpServers": {
          "filesystem": {
            "command": "npx",
            "args": [
              "-y",
              "@modelcontextprotocol/server-filesystem",
              "/Users/username/Desktop",
              "/Users/username/Downloads"
            ]
          }
        }
      }
      ```

      ```json Windows
      {
        "mcpServers": {
          "filesystem": {
            "command": "npx",
            "args": [
              "-y",
              "@modelcontextprotocol/server-filesystem",
              "C:\\Users\\username\\Desktop",
              "C:\\Users\\username\\Downloads"
            ]
          }
        }
      }
      ```
    </CodeGroup>

    Replace `username` with your actual computer username. The paths listed in the `args` array specify which directories the Filesystem Server can access. You can modify these paths or add additional directories as needed.

    <Tip>
      **Understanding the Configuration**

      * `"filesystem"`: A friendly name for the server that appears in Claude Desktop
      * `"command": "npx"`: Uses Node.js's npx tool to run the server
      * `"-y"`: Automatically confirms the installation of the server package
      * `"@modelcontextprotocol/server-filesystem"`: The package name of the Filesystem Server
      * The remaining arguments: Directories the server is allowed to access
    </Tip>

    <Warning>
      **Security Consideration**

      Only grant access to directories you're comfortable with Claude reading and modifying. The server runs with your user account permissions, so it can perform any file operations you can perform manually.
    </Warning>
  </Step>

  <Step title="Restart Claude Desktop">
    After saving the configuration file, completely quit Claude Desktop and restart it. The application needs to restart to load the new configuration and start the MCP server.

    Upon successful restart, you'll see an MCP server indicator <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=2742ec3fb97067e8591e68546c90221e" style={{display: 'inline', margin: 0, height: '1.3em'}} data-og-width="24" width="24" data-og-height="24" height="24" data-path="images/claude-desktop-mcp-slider.svg" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=52839f8519f476623c4fb5bb87ee24bd 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=f0491976e108286441fc6554309c5c4f 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=08e83eb102eda755a7db1eb27d16ebff 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=2524a80752928b0206e68e8e1890d1aa 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=3c0dc88dadad5ed8e8af316965d00e0b 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/claude-desktop-mcp-slider.svg?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=702363a955a631c40c342f9557d5cfdd 2500w" data-optimize="true" data-opv="2" /> in the bottom-right corner of the conversation input box:

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-slider.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=f80a38b720fc0519079bae26e2aae312" alt="Claude Desktop interface showing MCP server indicator" data-og-width="1414" width="1414" data-og-height="410" height="410" data-path="images/quickstart-slider.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-slider.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=24a0dc6f30664e953cc185ed0c7abc64 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-slider.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=d670a5fd82405775d7bc1e5f20a9a847 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-slider.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=5f66fa4bcaaf50ca905415f15af2e276 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-slider.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=4aecd3c4b45c3aaac75a118d2d6edda5 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-slider.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c7d321e2d25aa34552057a8866782549 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-slider.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=25dc1761b40b11ccb727b36183efa57f 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    Click on this indicator to view the available tools provided by the Filesystem Server:

    <Frame style={{ textAlign: "center" }}>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-tools.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=18f045f27f31f40896d3710ce9a4a0a0" width="400" alt="Available filesystem tools in Claude Desktop" data-og-width="978" data-og-height="902" data-path="images/quickstart-tools.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-tools.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=298fc5cf79822ee781d15cf6374d8542 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-tools.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c1e39ca66d9191dbe493cdcb52ad3fcb 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-tools.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=d797f46eb55126de14328ede4b735967 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-tools.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=fcb9d89b6cef95bf9a3ffcd9231a4026 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-tools.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=23097f8f8b52a255246aeb83f85f949d 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-tools.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0007b81f22a6a9b9a117981091e0221f 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    If the server indicator doesn't appear, refer to the [Troubleshooting](#troubleshooting) section for debugging steps.
  </Step>
</Steps>

## Using the Filesystem Server

With the Filesystem Server connected, Claude can now interact with your file system. Try these example requests to explore the capabilities:

### File Management Examples

* **"Can you write a poem and save it to my desktop?"** - Claude will compose a poem and create a new text file on your desktop
* **"What work-related files are in my downloads folder?"** - Claude will scan your downloads and identify work-related documents
* **"Please organize all images on my desktop into a new folder called 'Images'"** - Claude will create a folder and move image files into it

### How Approval Works

Before executing any file system operation, Claude will request your approval. This ensures you maintain control over all actions:

<Frame style={{ textAlign: "center" }}>
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-approve.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=98cc6e9dfe885fbd6e9bfae40601e494" width="500" alt="Claude requesting approval to perform a file operation" data-og-width="962" data-og-height="464" data-path="images/quickstart-approve.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-approve.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=d5ab1456f7728dcf93652b6542377ca3 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-approve.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=06809ba885f94726178efefed355395c 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-approve.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=a437dd1dd46c0d7cae1767f846eb100a 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-approve.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=d4323361de72398163de4500fd398cf3 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-approve.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=b7f5117fb238e9e7e455b58e1637cca1 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-approve.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=ab48fb927eaaf919c5ccf063a958bab6 2500w" data-optimize="true" data-opv="2" />
</Frame>

Review each request carefully before approving. You can always deny a request if you're not comfortable with the proposed action.

## Troubleshooting

If you encounter issues setting up or using the Filesystem Server, these solutions address common problems:

<AccordionGroup>
  <Accordion title="Server not showing up in Claude / hammer icon missing">
    1. Restart Claude Desktop completely
    2. Check your `claude_desktop_config.json` file syntax
    3. Make sure the file paths included in `claude_desktop_config.json` are valid and that they are absolute and not relative
    4. Look at [logs](#getting-logs-from-claude-for-desktop) to see why the server is not connecting
    5. In your command line, try manually running the server (replacing `username` as you did in `claude_desktop_config.json`) to see if you get any errors:

    <CodeGroup>
      ```bash macOS/Linux
      npx -y @modelcontextprotocol/server-filesystem /Users/username/Desktop /Users/username/Downloads
      ```

      ```powershell Windows
      npx -y @modelcontextprotocol/server-filesystem C:\Users\username\Desktop C:\Users\username\Downloads
      ```
    </CodeGroup>
  </Accordion>

  <Accordion title="Getting logs from Claude Desktop">
    Claude.app logging related to MCP is written to log files in:

    * macOS: `~/Library/Logs/Claude`

    * Windows: `%APPDATA%\Claude\logs`

    * `mcp.log` will contain general logging about MCP connections and connection failures.

    * Files named `mcp-server-SERVERNAME.log` will contain error (stderr) logging from the named server.

    You can run the following command to list recent logs and follow along with any new ones (on Windows, it will only show recent logs):

    <CodeGroup>
      ```bash macOS/Linux
      tail -n 20 -f ~/Library/Logs/Claude/mcp*.log
      ```

      ```powershell Windows
      type "%APPDATA%\Claude\logs\mcp*.log"
      ```
    </CodeGroup>
  </Accordion>

  <Accordion title="Tool calls failing silently">
    If Claude attempts to use the tools but they fail:

    1. Check Claude's logs for errors
    2. Verify your server builds and runs without errors
    3. Try restarting Claude Desktop
  </Accordion>

  <Accordion title="None of this is working. What do I do?">
    Please refer to our [debugging guide](/legacy/tools/debugging) for better debugging tools and more detailed guidance.
  </Accordion>

  <Accordion title="ENOENT error and `${APPDATA}` in paths on Windows">
    If your configured server fails to load, and you see within its logs an error referring to `${APPDATA}` within a path, you may need to add the expanded value of `%APPDATA%` to your `env` key in `claude_desktop_config.json`:

    ```json
    {
      "brave-search": {
        "command": "npx",
        "args": ["-y", "@modelcontextprotocol/server-brave-search"],
        "env": {
          "APPDATA": "C:\\Users\\user\\AppData\\Roaming\\",
          "BRAVE_API_KEY": "..."
        }
      }
    }
    ```

    With this change in place, launch Claude Desktop once again.

    <Warning>
      **NPM should be installed globally**

      The `npx` command may continue to fail if you have not installed NPM globally. If NPM is already installed globally, you will find `%APPDATA%\npm` exists on your system. If not, you can install NPM globally by running the following command:

      ```bash
      npm install -g npm
      ```
    </Warning>
  </Accordion>
</AccordionGroup>

## Next Steps

Now that you've successfully connected Claude Desktop to a local MCP server, explore these options to expand your setup:

<CardGroup cols={2}>
  <Card title="Explore other servers" icon="grid" href="https://github.com/modelcontextprotocol/servers">
    Browse our collection of official and community-created MCP servers for
    additional capabilities
  </Card>

  <Card title="Build your own server" icon="code" href="/docs/develop/build-server">
    Create custom MCP servers tailored to your specific workflows and
    integrations
  </Card>

  <Card title="Connect to remote servers" icon="cloud" href="/docs/develop/connect-remote-servers">
    Learn how to connect Claude to remote MCP servers for cloud-based tools and
    services
  </Card>

  <Card title="Understand the protocol" icon="book" href="/docs/learn/architecture">
    Dive deeper into how MCP works and its architecture
  </Card>
</CardGroup>


# Connect to remote MCP Servers
Source: https://modelcontextprotocol.io/docs/develop/connect-remote-servers

Learn how to connect Claude to remote MCP servers and extend its capabilities with internet-hosted tools and data sources

Remote MCP servers extend AI applications' capabilities beyond your local environment, providing access to internet-hosted tools, services, and data sources. By connecting to remote MCP servers, you transform AI assistants from helpful tools into informed teammates capable of handling complex, multi-step projects with real-time access to external resources.

Many clients now support remote MCP servers, enabling a wide range of integration possibilities. This guide demonstrates how to connect to remote MCP servers using [Claude](https://claude.ai/) as an example, one of the [many clients that support MCP](/clients). While we focus on Claude's implementation through Custom Connectors, the concepts apply broadly to other MCP-compatible clients.

## Understanding Remote MCP Servers

Remote MCP servers function similarly to local MCP servers but are hosted on the internet rather than your local machine. They expose tools, prompts, and resources that Claude can use to perform tasks on your behalf. These servers can integrate with various services such as project management tools, documentation systems, code repositories, and any other API-enabled service.

The key advantage of remote MCP servers is their accessibility. Unlike local servers that require installation and configuration on each device, remote servers are available from any MCP client with an internet connection. This makes them ideal for web-based AI applications, integrations that emphasize ease-of-use and services that require server-side processing or authentication.

## What are Custom Connectors?

Custom Connectors serve as the bridge between Claude and remote MCP servers. They allow you to connect Claude directly to the tools and data sources that matter most to your workflows, enabling Claude to operate within your favorite software and draw insights from the complete context of your external tools.

With Custom Connectors, you can:

* [Connect Claude to existing remote MCP servers](https://support.anthropic.com/en/articles/11175166-getting-started-with-custom-connectors-using-remote-mcp) provided by third-party developers
* [Build your own remote MCP servers to connect with any tool](https://support.anthropic.com/en/articles/11503834-building-custom-connectors-via-remote-mcp-servers)

## Connecting to a Remote MCP Server

The process of connecting Claude to a remote MCP server involves adding a Custom Connector through the [Claude interface](https://claude.ai/). This establishes a secure connection between Claude and your chosen remote server.

<Steps>
  <Step title="Navigate to Connector Settings">
    Open Claude in your browser and navigate to the settings page. You can access this by clicking on your profile icon and selecting "Settings" from the dropdown menu. Once in settings, locate and click on the "Connectors" section in the sidebar.

    This will display your currently configured connectors and provide options to add new ones.
  </Step>

  <Step title="Add a Custom Connector">
    In the Connectors section, scroll to the bottom where you'll find the "Add custom connector" button. Click this button to begin the connection process.

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/1-add-connector.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=b5ae9b23164875bbaa3aff4c178cdc64" alt="Add custom connector button in Claude settings" data-og-width="1038" width="1038" data-og-height="809" height="809" data-path="images/quickstart-remote/1-add-connector.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/1-add-connector.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=df494c13492290da8cbf33320405bc60 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/1-add-connector.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=a2dce224fb5e1636218ea2806962c89f 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/1-add-connector.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=de18294dd3cad23989c04cedbacff74f 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/1-add-connector.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c55cb3531701df2b5dfd721dcd3f48dc 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/1-add-connector.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=b0d3e56c4c445ba6896d49997dcdf2c0 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/1-add-connector.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=9d83f4f2db7441a39ff8733d97243ab9 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    A dialog will appear prompting you to enter the remote MCP server URL. This URL should be provided by the server developer or administrator. Enter the complete URL, ensuring it includes the proper protocol (https\://) and any necessary path components.

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/2-connect.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0934f16d8e016cade8e560c8f89d011b" alt="Dialog for entering remote MCP server URL" data-og-width="1616" width="1616" data-og-height="282" height="282" data-path="images/quickstart-remote/2-connect.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/2-connect.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=e3d7318b0b8e691d25e1887e80200b60 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/2-connect.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=be3edc7b361eecaabf688c2058b5e466 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/2-connect.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=31be86114b31e1c5e813d92a4c0cb1c3 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/2-connect.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=15b6cd3819fabd3655a52b930d384b51 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/2-connect.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=5ef180101a7fb0901f7ecf1b5efd254f 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/2-connect.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c024f625ec6ee3f7959513ba15adf524 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    After entering the URL, click "Add" to proceed with the connection.
  </Step>

  <Step title="Complete Authentication">
    Most remote MCP servers require authentication to ensure secure access to their resources. The authentication process varies depending on the server implementation but commonly involves OAuth, API keys, or username/password combinations.

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/3-auth.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=89af6e1b85718637231388697cc7b015" alt="Authentication screen for remote MCP server" data-og-width="490" width="490" data-og-height="806" height="806" data-path="images/quickstart-remote/3-auth.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/3-auth.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=cde1e30b4c3b99b5edc5575c5958e9e7 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/3-auth.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=e2cef2daadce577ce335949d3f425257 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/3-auth.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=4e06599391ebf6bcb521cb4000469844 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/3-auth.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=e78e71303fd5bb7d1e5c1602dca7641b 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/3-auth.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=2e49d390bddf2a37fef4cba409e9950f 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/3-auth.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=47ec70901a76a3209267b2078f9f8011 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    Follow the authentication prompts provided by the server. This may redirect you to a third-party authentication provider or display a form within Claude. Once authentication is complete, Claude will establish a secure connection to the remote server.
  </Step>

  <Step title="Access Resources and Prompts">
    After successful connection, the remote server's resources and prompts become available in your Claude conversations. You can access these by clicking the paperclip icon in the message input area, which opens the attachment menu.

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/4-select-resources-menu.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=ecc6234b0fe5625e24cc2b02b7893c67" alt="Attachment menu showing available resources" data-og-width="735" width="735" data-og-height="666" height="666" data-path="images/quickstart-remote/4-select-resources-menu.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/4-select-resources-menu.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=6e853446286f2c2caf1c7137e4293db4 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/4-select-resources-menu.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7c3c5b7d2f8d078bc263b0603a4136d1 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/4-select-resources-menu.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=280e1d1547925f73f33fcf404eac5ba2 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/4-select-resources-menu.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=00fc5842c2d6592f41f96c2051b016e2 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/4-select-resources-menu.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=505d4ec95d83f4e52cf9c60780b225fe 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/4-select-resources-menu.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=07178c22a89472b962639854dc029953 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    The menu displays all available resources and prompts from your connected servers. Select the items you want to include in your conversation. These resources provide Claude with context and information from your external tools.

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/5-select-prompts-resources.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=30c522540c7ff5abd8617d20b329eca2" alt="Selecting specific resources and prompts from the menu" data-og-width="648" width="648" data-og-height="920" height="920" data-path="images/quickstart-remote/5-select-prompts-resources.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/5-select-prompts-resources.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7361585026d3dd1f0c218232ce475d59 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/5-select-prompts-resources.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=eb5162947ac8110569225e4ff36ac54c 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/5-select-prompts-resources.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=93b0b1de76b11785deb6cd2b8bbbb33e 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/5-select-prompts-resources.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=19d1f1de9b7b38dff6fabaea260fc700 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/5-select-prompts-resources.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=587ee6b0f0831f7b9c827db58e4c53a6 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/5-select-prompts-resources.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=a875a3599b478977e1322c07b82a5879 2500w" data-optimize="true" data-opv="2" />
    </Frame>
  </Step>

  <Step title="Configure Tool Permissions">
    Remote MCP servers often expose multiple tools with varying capabilities. You can control which tools Claude is allowed to use by configuring permissions in the connector settings. This ensures Claude only performs actions you've explicitly authorized.

    <Frame>
      <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/6-configure-tools.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=1e55fd2f7da85150bfcf9dfbd7a31f44" alt="Tool permission configuration interface" data-og-width="604" width="604" data-og-height="745" height="745" data-path="images/quickstart-remote/6-configure-tools.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/6-configure-tools.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=6ece557353a2b8227cfc033ee7533fbc 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/6-configure-tools.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=aa954f4a018077d6a4a3c9406cdd4a63 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/6-configure-tools.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=309fd1583dd23081ed93eca4fb85c5e0 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/6-configure-tools.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=8b7ea5b326ea5cf8947e9b9aba28f2f7 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/6-configure-tools.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7e02024cdcae2b7c41aab3d5c4f4e75e 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/quickstart-remote/6-configure-tools.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=f953404ab1cb149e160eaa139c53d701 2500w" data-optimize="true" data-opv="2" />
    </Frame>

    Navigate back to the Connectors settings and click on your connected server. Here you can enable or disable specific tools, set usage limits, and configure other security parameters according to your needs.
  </Step>
</Steps>

## Best Practices for Using Remote MCP Servers

When working with remote MCP servers, consider these recommendations to ensure a secure and efficient experience:

**Security considerations**: Always verify the authenticity of remote MCP servers before connecting. Only connect to servers from trusted sources, and review the permissions requested during authentication. Be cautious about granting access to sensitive data or systems.

**Managing multiple connectors**: You can connect to multiple remote MCP servers simultaneously. Organize your connectors by purpose or project to maintain clarity. Regularly review and remove connectors you no longer use to keep your workspace organized and secure.

## Next Steps

Now that you've connected Claude to a remote MCP server, you can explore its capabilities in your conversations. Try using the connected tools to automate tasks, access external data, or integrate with your existing workflows.

<CardGroup cols={2}>
  <Card title="Build your own remote server" icon="cloud" href="https://support.anthropic.com/en/articles/11503834-building-custom-connectors-via-remote-mcp-servers">
    Create custom remote MCP servers to integrate with proprietary tools and
    services
  </Card>

  <Card title="Explore available servers" icon="grid" href="https://github.com/modelcontextprotocol/servers">
    Browse our collection of official and community-created MCP servers
  </Card>

  <Card title="Connect local servers" icon="computer" href="/docs/develop/connect-local-servers">
    Learn how to connect Claude Desktop to local MCP servers for direct system
    access
  </Card>

  <Card title="Understand the architecture" icon="book" href="/docs/learn/architecture">
    Dive deeper into how MCP works and its architecture
  </Card>
</CardGroup>

Remote MCP servers unlock powerful possibilities for extending Claude's capabilities. As you become familiar with these integrations, you'll discover new ways to streamline your workflows and accomplish complex tasks more efficiently.


# What is the Model Context Protocol (MCP)?
Source: https://modelcontextprotocol.io/docs/getting-started/intro



MCP (Model Context Protocol) is an open-source standard for connecting AI applications to external systems.

Using MCP, AI applications like Claude or ChatGPT can connect to data sources (e.g. local files, databases), tools (e.g. search engines, calculators) and workflows (e.g. specialized prompts)—enabling them to access key information and perform tasks.

Think of MCP like a USB-C port for AI applications. Just as USB-C provides a standardized way to connect electronic devices, MCP provides a standardized way to connect AI applications to external systems.

<Frame>
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-simple-diagram.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=9337f8096debc55621adcaf8ca563695" data-og-width="3840" width="3840" data-og-height="1500" height="1500" data-path="images/mcp-simple-diagram.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-simple-diagram.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=147db2e81f434cae3ba44da988154fe5 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-simple-diagram.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=16251036cd56dc50e8ef32918b99d1da 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-simple-diagram.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=8b44b031c68d1c10fb0c443f09d237f1 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-simple-diagram.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=0a319cb6a2504659377de862e889b8da 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-simple-diagram.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=37d50a5429a8f662c1beb564b4df8e65 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-simple-diagram.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=ce4f99af2930b3b992909963a284c874 2500w" data-optimize="true" data-opv="2" />
</Frame>

## What can MCP enable?

* Agents can access your Google Calendar and Notion, acting as a more personalized AI assistant.
* Claude Code can generate an entire web app using a Figma design.
* Enterprise chatbots can connect to multiple databases across an organization, empowering users to analyze data using chat.
* AI models can create 3D designs on Blender and print them out using a 3D printer.

## Why does MCP matter?

Depending on where you sit in the ecosystem, MCP can have a range of benefits.

* **Developers**: MCP reduces development time and complexity when building, or integrating with, an AI application or agent.
* **AI applications or agents**: MCP provides access to an ecosystem of data sources, tools and apps which will enhance capabilities and improve the end-user experience.
* **End-users**: MCP results in more capable AI applications or agents which can access your data and take actions on your behalf when necessary.

## Start Building

<CardGroup cols={2}>
  <Card title="Build servers" icon="server" href="/docs/develop/build-server">
    Create MCP servers to expose your data and tools
  </Card>

  <Card title="Build clients" icon="computer" href="/docs/develop/build-client">
    Develop applications that connect to MCP servers
  </Card>
</CardGroup>

## Learn more

<CardGroup cols={2}>
  <Card title="Understand concepts" icon="book" href="/docs/learn/architecture">
    Learn the core concepts and architecture of MCP
  </Card>
</CardGroup>


# Architecture overview
Source: https://modelcontextprotocol.io/docs/learn/architecture



This overview of the Model Context Protocol (MCP) discusses its [scope](#scope) and [core concepts](#concepts-of-mcp), and provides an [example](#example) demonstrating each core concept.

Because MCP SDKs abstract away many concerns, most developers will likely find the [data layer protocol](#data-layer-protocol) section to be the most useful. It discusses how MCP servers can provide context to an AI application.

For specific implementation details, please refer to the documentation for your [language-specific SDK](/docs/sdk).

## Scope

The Model Context Protocol includes the following projects:

* [MCP Specification](https://modelcontextprotocol.io/specification/latest): A specification of MCP that outlines the implementation requirements for clients and servers.
* [MCP SDKs](/docs/sdk): SDKs for different programming languages that implement MCP.
* **MCP Development Tools**: Tools for developing MCP servers and clients, including the [MCP Inspector](https://github.com/modelcontextprotocol/inspector)
* [MCP Reference Server Implementations](https://github.com/modelcontextprotocol/servers): Reference implementations of MCP servers.

<Note>
  MCP focuses solely on the protocol for context exchange—it does not dictate
  how AI applications use LLMs or manage the provided context.
</Note>

## Concepts of MCP

### Participants

MCP follows a client-server architecture where an MCP host — an AI application like [Claude Code](https://www.anthropic.com/claude-code) or [Claude Desktop](https://www.claude.ai/download) — establishes connections to one or more MCP servers. The MCP host accomplishes this by creating one MCP client for each MCP server. Each MCP client maintains a dedicated one-to-one connection with its corresponding MCP server.

The key participants in the MCP architecture are:

* **MCP Host**: The AI application that coordinates and manages one or multiple MCP clients
* **MCP Client**: A component that maintains a connection to an MCP server and obtains context from an MCP server for the MCP host to use
* **MCP Server**: A program that provides context to MCP clients

**For example**: Visual Studio Code acts as an MCP host. When Visual Studio Code establishes a connection to an MCP server, such as the [Sentry MCP server](https://docs.sentry.io/product/sentry-mcp/), the Visual Studio Code runtime instantiates an MCP client object that maintains the connection to the Sentry MCP server.
When Visual Studio Code subsequently connects to another MCP server, such as the [local filesystem server](https://github.com/modelcontextprotocol/servers/tree/main/src/filesystem), the Visual Studio Code runtime instantiates an additional MCP client object to maintain this connection, hence maintaining a one-to-one
relationship of MCP clients to MCP servers.

```mermaid
graph TB
    subgraph "MCP Host (AI Application)"
        Client1["MCP Client 1"]
        Client2["MCP Client 2"]
        Client3["MCP Client 3"]
    end

    Server1["MCP Server 1<br/>(e.g., Sentry)"]
    Server2["MCP Server 2<br/>(e.g., Filesystem)"]
    Server3["MCP Server 3<br/>(e.g., Database)"]

    Client1 ---|"One-to-one<br/>connection"| Server1
    Client2 ---|"One-to-one<br/>connection"| Server2
    Client3 ---|"One-to-one<br/>connection"| Server3

    style Client1 fill:#e1f5fe
    style Client2 fill:#e1f5fe
    style Client3 fill:#e1f5fe
    style Server1 fill:#f3e5f5
    style Server2 fill:#f3e5f5
    style Server3 fill:#f3e5f5
```

Note that **MCP server** refers to the program that serves context data, regardless of
where it runs. MCP servers can execute locally or remotely. For example, when
Claude Desktop launches the [filesystem
server](https://github.com/modelcontextprotocol/servers/tree/main/src/filesystem),
the server runs locally on the same machine because it uses the STDIO
transport. This is commonly referred to as a "local" MCP server. The official
[Sentry MCP server](https://docs.sentry.io/product/sentry-mcp/) runs on the
Sentry platform, and uses the Streamable HTTP transport. This is commonly
referred to as a "remote" MCP server.

### Layers

MCP consists of two layers:

* **Data layer**: Defines the JSON-RPC based protocol for client-server communication, including lifecycle management, and core primitives, such as tools, resources, prompts and notifications.
* **Transport layer**: Defines the communication mechanisms and channels that enable data exchange between clients and servers, including transport-specific connection establishment, message framing, and authorization.

Conceptually the data layer is the inner layer, while the transport layer is the outer layer.

#### Data layer

The data layer implements a [JSON-RPC 2.0](https://www.jsonrpc.org/) based exchange protocol that defines the message structure and semantics.
This layer includes:

* **Lifecycle management**: Handles connection initialization, capability negotiation, and connection termination between clients and servers
* **Server features**: Enables servers to provide core functionality including tools for AI actions, resources for context data, and prompts for interaction templates from and to the client
* **Client features**: Enables servers to ask the client to sample from the host LLM, elicit input from the user, and log messages to the client
* **Utility features**: Supports additional capabilities like notifications for real-time updates and progress tracking for long-running operations

#### Transport layer

The transport layer manages communication channels and authentication between clients and servers. It handles connection establishment, message framing, and secure communication between MCP participants.

MCP supports two transport mechanisms:

* **Stdio transport**: Uses standard input/output streams for direct process communication between local processes on the same machine, providing optimal performance with no network overhead.
* **Streamable HTTP transport**: Uses HTTP POST for client-to-server messages with optional Server-Sent Events for streaming capabilities. This transport enables remote server communication and supports standard HTTP authentication methods including bearer tokens, API keys, and custom headers. MCP recommends using OAuth to obtain authentication tokens.

The transport layer abstracts communication details from the protocol layer, enabling the same JSON-RPC 2.0 message format across all transport mechanisms.

### Data Layer Protocol

A core part of MCP is defining the schema and semantics between MCP clients and MCP servers. Developers will likely find the data layer — in particular, the set of [primitives](#primitives) — to be the most interesting part of MCP. It is the part of MCP that defines the ways developers can share context from MCP servers to MCP clients.

MCP uses [JSON-RPC 2.0](https://www.jsonrpc.org/) as its underlying RPC protocol. Client and servers send requests to each other and respond accordingly. Notifications can be used when no response is required.

#### Lifecycle management

MCP is a <Tooltip tip="A subset of MCP can be made stateless using the Streamable HTTP transport">stateful protocol</Tooltip> that requires lifecycle management. The purpose of lifecycle management is to negotiate the <Tooltip tip="Features and operations that a client or server supports, such as tools, resources, or prompts">capabilities</Tooltip> that both client and server support. Detailed information can be found in the [specification](/specification/2025-06-18/basic/lifecycle), and the [example](#example) showcases the initialization sequence.

#### Primitives

MCP primitives are the most important concept within MCP. They define what clients and servers can offer each other. These primitives specify the types of contextual information that can be shared with AI applications and the range of actions that can be performed.

MCP defines three core primitives that *servers* can expose:

* **Tools**: Executable functions that AI applications can invoke to perform actions (e.g., file operations, API calls, database queries)
* **Resources**: Data sources that provide contextual information to AI applications (e.g., file contents, database records, API responses)
* **Prompts**: Reusable templates that help structure interactions with language models (e.g., system prompts, few-shot examples)

Each primitive type has associated methods for discovery (`*/list`), retrieval (`*/get`), and in some cases, execution (`tools/call`).
MCP clients will use the `*/list` methods to discover available primitives. For example, a client can first list all available tools (`tools/list`) and then execute them. This design allows listings to be dynamic.

As a concrete example, consider an MCP server that provides context about a database. It can expose tools for querying the database, a resource that contains the schema of the database, and a prompt that includes few-shot examples for interacting with the tools.

For more details about server primitives see [server concepts](./server-concepts).

MCP also defines primitives that *clients* can expose. These primitives allow MCP server authors to build richer interactions.

* **Sampling**: Allows servers to request language model completions from the client's AI application. This is useful when servers' authors want access to a language model, but want to stay model independent and not include a language model SDK in their MCP server. They can use the `sampling/complete` method to request a language model completion from the client's AI application.
* **Elicitation**: Allows servers to request additional information from users. This is useful when servers' authors want to get more information from the user, or ask for confirmation of an action. They can use the `elicitation/request` method to request additional information from the user.
* **Logging**: Enables servers to send log messages to clients for debugging and monitoring purposes.

For more details about client primitives see [client concepts](./client-concepts).

#### Notifications

The protocol supports real-time notifications to enable dynamic updates between servers and clients. For example, when a server's available tools change—such as when new functionality becomes available or existing tools are modified—the server can send tool update notifications to inform connected clients about these changes. Notifications are sent as JSON-RPC 2.0 notification messages (without expecting a response) and enable MCP servers to provide real-time updates to connected clients.

## Example

### Data Layer

This section provides a step-by-step walkthrough of an MCP client-server interaction, focusing on the data layer protocol. We'll demonstrate the lifecycle sequence, tool operations, and notifications using JSON-RPC 2.0 messages.

<Steps>
  <Step title="Initialization (Lifecycle Management)">
    MCP begins with lifecycle management through a capability negotiation handshake. As described in the [lifecycle management](#lifecycle-management) section, the client sends an `initialize` request to establish the connection and negotiate supported features.

    <CodeGroup>
      ```json Initialize Request
      {
        "jsonrpc": "2.0",
        "id": 1,
        "method": "initialize",
        "params": {
          "protocolVersion": "2025-06-18",
          "capabilities": {
            "elicitation": {}
          },
          "clientInfo": {
            "name": "example-client",
            "version": "1.0.0"
          }
        }
      }
      ```

      ```json Initialize Response
      {
        "jsonrpc": "2.0",
        "id": 1,
        "result": {
          "protocolVersion": "2025-06-18",
          "capabilities": {
            "tools": {
              "listChanged": true
            },
            "resources": {}
          },
          "serverInfo": {
            "name": "example-server",
            "version": "1.0.0"
          }
        }
      }
      ```
    </CodeGroup>

    #### Understanding the Initialization Exchange

    The initialization process is a key part of MCP's lifecycle management and serves several critical purposes:

    1. **Protocol Version Negotiation**: The `protocolVersion` field (e.g., "2025-06-18") ensures both client and server are using compatible protocol versions. This prevents communication errors that could occur when different versions attempt to interact. If a mutually compatible version is not negotiated, the connection should be terminated.

    2. **Capability Discovery**: The `capabilities` object allows each party to declare what features they support, including which [primitives](#primitives) they can handle (tools, resources, prompts) and whether they support features like [notifications](#notifications). This enables efficient communication by avoiding unsupported operations.

    3. **Identity Exchange**: The `clientInfo` and `serverInfo` objects provide identification and versioning information for debugging and compatibility purposes.

    In this example, the capability negotiation demonstrates how MCP primitives are declared:

    **Client Capabilities**:

    * `"elicitation": {}` - The client declares it can work with user interaction requests (can receive `elicitation/create` method calls)

    **Server Capabilities**:

    * `"tools": {"listChanged": true}` - The server supports the tools primitive AND can send `tools/list_changed` notifications when its tool list changes
    * `"resources": {}` - The server also supports the resources primitive (can handle `resources/list` and `resources/read` methods)

    After successful initialization, the client sends a notification to indicate it's ready:

    ```json Notification
    {
      "jsonrpc": "2.0",
      "method": "notifications/initialized"
    }
    ```

    #### How This Works in AI Applications

    During initialization, the AI application's MCP client manager establishes connections to configured servers and stores their capabilities for later use. The application uses this information to determine which servers can provide specific types of functionality (tools, resources, prompts) and whether they support real-time updates.

    ```python Pseudo-code for AI application initialization
    # Pseudo Code
    async with stdio_client(server_config) as (read, write):
        async with ClientSession(read, write) as session:
            init_response = await session.initialize()
            if init_response.capabilities.tools:
                app.register_mcp_server(session, supports_tools=True)
            app.set_server_ready(session)
    ```
  </Step>

  <Step title="Tool Discovery (Primitives)">
    Now that the connection is established, the client can discover available tools by sending a `tools/list` request. This request is fundamental to MCP's tool discovery mechanism — it allows clients to understand what tools are available on the server before attempting to use them.

    <CodeGroup>
      ```json Tools List Request
      {
        "jsonrpc": "2.0",
        "id": 2,
        "method": "tools/list"
      }
      ```

      ```json Tools List Response
      {
        "jsonrpc": "2.0",
        "id": 2,
        "result": {
          "tools": [
            {
              "name": "calculator_arithmetic",
              "title": "Calculator",
              "description": "Perform mathematical calculations including basic arithmetic, trigonometric functions, and algebraic operations",
              "inputSchema": {
                "type": "object",
                "properties": {
                  "expression": {
                    "type": "string",
                    "description": "Mathematical expression to evaluate (e.g., '2 + 3 * 4', 'sin(30)', 'sqrt(16)')"
                  }
                },
                "required": ["expression"]
              }
            },
            {
              "name": "weather_current",
              "title": "Weather Information",
              "description": "Get current weather information for any location worldwide",
              "inputSchema": {
                "type": "object",
                "properties": {
                  "location": {
                    "type": "string",
                    "description": "City name, address, or coordinates (latitude,longitude)"
                  },
                  "units": {
                    "type": "string",
                    "enum": ["metric", "imperial", "kelvin"],
                    "description": "Temperature units to use in response",
                    "default": "metric"
                  }
                },
                "required": ["location"]
              }
            }
          ]
        }
      }
      ```
    </CodeGroup>

    #### Understanding the Tool Discovery Request

    The `tools/list` request is simple, containing no parameters.

    #### Understanding the Tool Discovery Response

    The response contains a `tools` array that provides comprehensive metadata about each available tool. This array-based structure allows servers to expose multiple tools simultaneously while maintaining clear boundaries between different functionalities.

    Each tool object in the response includes several key fields:

    * **`name`**: A unique identifier for the tool within the server's namespace. This serves as the primary key for tool execution and should follow a clear naming pattern (e.g., `calculator_arithmetic` rather than just `calculate`)
    * **`title`**: A human-readable display name for the tool that clients can show to users
    * **`description`**: Detailed explanation of what the tool does and when to use it
    * **`inputSchema`**: A JSON Schema that defines the expected input parameters, enabling type validation and providing clear documentation about required and optional parameters

    #### How This Works in AI Applications

    The AI application fetches available tools from all connected MCP servers and combines them into a unified tool registry that the language model can access. This allows the LLM to understand what actions it can perform and automatically generates the appropriate tool calls during conversations.

    ```python Pseudo-code for AI application tool discovery
    # Pseudo-code using MCP Python SDK patterns
    available_tools = []
    for session in app.mcp_server_sessions():
        tools_response = await session.list_tools()
        available_tools.extend(tools_response.tools)
    conversation.register_available_tools(available_tools)
    ```
  </Step>

  <Step title="Tool Execution (Primitives)">
    The client can now execute a tool using the `tools/call` method. This demonstrates how MCP primitives are used in practice: after discovering available tools, the client can invoke them with appropriate arguments.

    #### Understanding the Tool Execution Request

    The `tools/call` request follows a structured format that ensures type safety and clear communication between client and server. Note that we're using the proper tool name from the discovery response (`weather_current`) rather than a simplified name:

    <CodeGroup>
      ```json Tool Call Request
      {
        "jsonrpc": "2.0",
        "id": 3,
        "method": "tools/call",
        "params": {
          "name": "weather_current",
          "arguments": {
            "location": "San Francisco",
            "units": "imperial"
          }
        }
      }
      ```

      ```json Tool Call Response
      {
        "jsonrpc": "2.0",
        "id": 3,
        "result": {
          "content": [
            {
              "type": "text",
              "text": "Current weather in San Francisco: 68°F, partly cloudy with light winds from the west at 8 mph. Humidity: 65%"
            }
          ]
        }
      }
      ```
    </CodeGroup>

    #### Key Elements of Tool Execution

    The request structure includes several important components:

    1. **`name`**: Must match exactly the tool name from the discovery response (`weather_current`). This ensures the server can correctly identify which tool to execute.

    2. **`arguments`**: Contains the input parameters as defined by the tool's `inputSchema`. In this example:
       * `location`: "San Francisco" (required parameter)
       * `units`: "imperial" (optional parameter, defaults to "metric" if not specified)

    3. **JSON-RPC Structure**: Uses standard JSON-RPC 2.0 format with unique `id` for request-response correlation.

    #### Understanding the Tool Execution Response

    The response demonstrates MCP's flexible content system:

    1. **`content` Array**: Tool responses return an array of content objects, allowing for rich, multi-format responses (text, images, resources, etc.)

    2. **Content Types**: Each content object has a `type` field. In this example, `"type": "text"` indicates plain text content, but MCP supports various content types for different use cases.

    3. **Structured Output**: The response provides actionable information that the AI application can use as context for language model interactions.

    This execution pattern allows AI applications to dynamically invoke server functionality and receive structured responses that can be integrated into conversations with language models.

    #### How This Works in AI Applications

    When the language model decides to use a tool during a conversation, the AI application intercepts the tool call, routes it to the appropriate MCP server, executes it, and returns the results back to the LLM as part of the conversation flow. This enables the LLM to access real-time data and perform actions in the external world.

    ```python
    # Pseudo-code for AI application tool execution
    async def handle_tool_call(conversation, tool_name, arguments):
        session = app.find_mcp_session_for_tool(tool_name)
        result = await session.call_tool(tool_name, arguments)
        conversation.add_tool_result(result.content)
    ```
  </Step>

  <Step title="Real-time Updates (Notifications)">
    MCP supports real-time notifications that enable servers to inform clients about changes without being explicitly requested. This demonstrates the notification system, a key feature that keeps MCP connections synchronized and responsive.

    #### Understanding Tool List Change Notifications

    When the server's available tools change—such as when new functionality becomes available, existing tools are modified, or tools become temporarily unavailable—the server can proactively notify connected clients:

    ```json Request
    {
      "jsonrpc": "2.0",
      "method": "notifications/tools/list_changed"
    }
    ```

    #### Key Features of MCP Notifications

    1. **No Response Required**: Notice there's no `id` field in the notification. This follows JSON-RPC 2.0 notification semantics where no response is expected or sent.

    2. **Capability-Based**: This notification is only sent by servers that declared `"listChanged": true` in their tools capability during initialization (as shown in Step 1).

    3. **Event-Driven**: The server decides when to send notifications based on internal state changes, making MCP connections dynamic and responsive.

    #### Client Response to Notifications

    Upon receiving this notification, the client typically reacts by requesting the updated tool list. This creates a refresh cycle that keeps the client's understanding of available tools current:

    ```json Request
    {
      "jsonrpc": "2.0",
      "id": 4,
      "method": "tools/list"
    }
    ```

    #### Why Notifications Matter

    This notification system is crucial for several reasons:

    1. **Dynamic Environments**: Tools may come and go based on server state, external dependencies, or user permissions
    2. **Efficiency**: Clients don't need to poll for changes; they're notified when updates occur
    3. **Consistency**: Ensures clients always have accurate information about available server capabilities
    4. **Real-time Collaboration**: Enables responsive AI applications that can adapt to changing contexts

    This notification pattern extends beyond tools to other MCP primitives, enabling comprehensive real-time synchronization between clients and servers.

    #### How This Works in AI Applications

    When the AI application receives a notification about changed tools, it immediately refreshes its tool registry and updates the LLM's available capabilities. This ensures that ongoing conversations always have access to the most current set of tools, and the LLM can dynamically adapt to new functionality as it becomes available.

    ```python
    # Pseudo-code for AI application notification handling
    async def handle_tools_changed_notification(session):
        tools_response = await session.list_tools()
        app.update_available_tools(session, tools_response.tools)
        if app.conversation.is_active():
            app.conversation.notify_llm_of_new_capabilities()
    ```
  </Step>
</Steps>


# Understanding MCP clients
Source: https://modelcontextprotocol.io/docs/learn/client-concepts



MCP clients are instantiated by host applications to communicate with particular MCP servers. The host application, like Claude.ai or an IDE, manages the overall user experience and coordinates multiple clients. Each client handles one direct communication with one server.

Understanding the distinction is important: the *host* is the application users interact with, while *clients* are the protocol-level components that enable server connections.

## Core Client Features

In addition to making use of context provided by servers, clients may provide several features to servers. These client features allow server authors to build richer interactions.

| Feature         | Explanation                                                                                                                                                                                       | Example                                                                                                                                |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------- |
| **Sampling**    | Sampling allows servers to request LLM completions through the client, enabling an agentic workflow. This approach puts the client in complete control of user permissions and security measures. | A server for booking travel may send a list of flights to an LLM and request that the LLM pick the best flight for the user.           |
| **Roots**       | Roots allow clients to specify which files servers can access, guiding them to relevant directories while maintaining security boundaries.                                                        | A server for booking travel may be given access to a specific directory, from which it can read a user's calendar.                     |
| **Elicitation** | Elicitation enables servers to request specific information from users during interactions, providing a structured way for servers to gather information on demand.                               | A server booking travel may ask for the user's preferences on airplane seats, room type or their contact number to finalise a booking. |

### Elicitation

Elicitation enables servers to request specific information from users during interactions, creating more dynamic and responsive workflows.

#### Overview

Elicitation provides a structured way for servers to gather necessary information on demand. Instead of requiring all information up front or failing when data is missing, servers can pause their operations to request specific inputs from users. This creates more flexible interactions where servers adapt to user needs rather than following rigid patterns.

**Elicitation flow:**

```mermaid
sequenceDiagram
    participant User
    participant Client
    participant Server

    Note over Server,Client: Server initiates elicitation
    Server->>Client: elicitation/create

    Note over Client,User: Human interaction
    Client->>User: Present elicitation UI
    User-->>Client: Provide requested information

    Note over Server,Client: Complete request
    Client-->>Server: Return user response

    Note over Server: Continue processing with new information
```

The flow enables dynamic information gathering. Servers can request specific data when needed, users provide information through appropriate UI, and servers continue processing with the newly acquired context.

**Elicitation components example:**

```typescript
{
  method: "elicitation/requestInput",
  params: {
    message: "Please confirm your Barcelona vacation booking details:",
    schema: {
      type: "object",
      properties: {
        confirmBooking: {
          type: "boolean",
          description: "Confirm the booking (Flights + Hotel = $3,000)"
        },
        seatPreference: {
          type: "string",
          enum: ["window", "aisle", "no preference"],
          description: "Preferred seat type for flights"
        },
        roomType: {
          type: "string",
          enum: ["sea view", "city view", "garden view"],
          description: "Preferred room type at hotel"
        },
        travelInsurance: {
          type: "boolean",
          default: false,
          description: "Add travel insurance ($150)"
        }
      },
      required: ["confirmBooking"]
    }
  }
}
```

#### Example: Holiday Booking Approval

A travel booking server demonstrates elicitation's power through the final booking confirmation process. When a user has selected their ideal vacation package to Barcelona, the server needs to gather final approval and any missing details before proceeding.

The server elicits booking confirmation with a structured request that includes the trip summary (Barcelona flights June 15-22, beachfront hotel, total \$3,000) and fields for any additional preferences—such as seat selection, room type, or travel insurance options.

As the booking progresses, the server elicits contact information needed to complete the reservation. It might ask for traveler details for flight bookings, special requests for the hotel, or emergency contact information.

#### User Interaction Model

Elicitation interactions are designed to be clear, contextual, and respectful of user autonomy:

**Request presentation**: Clients display elicitation requests with clear context about which server is asking, why the information is needed, and how it will be used. The request message explains the purpose while the schema provides structure and validation.

**Response options**: Users can provide the requested information through appropriate UI controls (text fields, dropdowns, checkboxes), decline to provide information with optional explanation, or cancel the entire operation. Clients validate responses against the provided schema before returning them to servers.

**Privacy considerations**: Elicitation never requests passwords or API keys. Clients warn about suspicious requests and let users review data before sending.

### Roots

Roots define filesystem boundaries for server operations, allowing clients to specify which directories servers should focus on.

#### Overview

Roots are a mechanism for clients to communicate filesystem access boundaries to servers. They consist of file URIs that indicate directories where servers can operate, helping servers understand the scope of available files and folders. Rather than giving servers unrestricted filesystem access, roots guide them to relevant working directories while maintaining security boundaries.

**Root structure:**

```json
{
  "uri": "file:///Users/agent/travel-planning",
  "name": "Travel Planning Workspace"
}
```

Roots are exclusively filesystem paths and always use the `file://` URI scheme. They help servers understand project boundaries, workspace organization, and accessible directories. The roots list can be updated dynamically as users work with different projects or folders, with servers receiving notifications through `roots/list_changed` when boundaries change.

It's important to note that while roots provide guidance to servers about where to operate, the client is always in full control of file access. Roots simply communicate intended boundaries—actual file access is always mediated by the client's security policies.

#### Example: Travel Planning Workspace

A travel agent working with multiple client trips benefits from roots to organize filesystem access. Consider a workspace with different directories for various aspects of travel planning.

The client provides filesystem roots to the travel planning server:

* `file:///Users/agent/travel-planning` - Main workspace containing all travel files
* `file:///Users/agent/travel-templates` - Reusable itinerary templates and resources
* `file:///Users/agent/client-documents` - Client passports and travel documents

When the agent creates a Barcelona itinerary, the server works within these boundaries—accessing templates, saving the new itinerary, and referencing client documents. It cannot access files outside these roots. Servers typically access files within roots by using relative paths from the root directories or by utilizing file search tools that respect the root boundaries.

If the agent opens an archive folder like `file:///Users/agent/archive/2023-trips`, the client updates the roots list via `roots/list_changed`.

#### User Interaction Model

Roots are typically managed automatically by host applications based on user actions, though some applications may expose manual root management:

**Automatic root detection**: When users open folders, clients automatically expose them as roots. Opening a travel workspace gives servers access to itineraries and documents within that directory.

**Manual root configuration**: Advanced users can specify roots through configuration. For example, adding `/travel-templates` for reusable resources while excluding directories with financial records.

### Sampling

Sampling allows servers to request language model completions through the client, enabling agentic behaviors while maintaining security and user control.

#### Overview

Sampling enables servers to perform AI-dependent tasks without directly integrating with or paying for AI models. Instead, servers can request that the client—which already has AI model access—handle these tasks on their behalf. This approach puts the client in complete control of user permissions and security measures. Because sampling requests occur within the context of other operations—like a tool analyzing data—and are processed as separate model calls, they maintain clear boundaries between different contexts, allowing for more efficient use of the context window.

**Sampling flow:**

```mermaid
sequenceDiagram
    participant LLM
    participant User
    participant Client
    participant Server

    Note over Server,Client: Server initiates sampling
    Server->>Client: sampling/createMessage

    Note over Client,User: Human-in-the-loop review
    Client->>User: Present request for approval
    User-->>Client: Review and approve/modify

    Note over Client,LLM: Model interaction
    Client->>LLM: Forward approved request
    LLM-->>Client: Return generation

    Note over Client,User: Response review
    Client->>User: Present response for approval
    User-->>Client: Review and approve/modify

    Note over Server,Client: Complete request
    Client-->>Server: Return approved response
```

The flow ensures security through multiple human-in-the-loop checkpoints. Users review and can modify both the initial request and the generated response before it returns to the server.

**Request parameters example:**

```typescript
{
  messages: [
    {
      role: "user",
      content: "Analyze these flight options and recommend the best choice:\n" +
               "[47 flights with prices, times, airlines, and layovers]\n" +
               "User preferences: morning departure, max 1 layover"
    }
  ],
  modelPreferences: {
    hints: [{
      name: "claude-3-5-sonnet"  // Suggested model
    }],
    costPriority: 0.3,      // Less concerned about API cost
    speedPriority: 0.2,     // Can wait for thorough analysis
    intelligencePriority: 0.9  // Need complex trade-off evaluation
  },
  systemPrompt: "You are a travel expert helping users find the best flights based on their preferences",
  maxTokens: 1500
}
```

#### Example: Flight Analysis Tool

Consider a travel booking server with a tool called `findBestFlight` that uses sampling to analyze available flights and recommend the optimal choice. When a user asks "Book me the best flight to Barcelona next month," the tool needs AI assistance to evaluate complex trade-offs.

The tool queries airline APIs and gathers 47 flight options. It then requests AI assistance to analyze these options: "Analyze these flight options and recommend the best choice: \[47 flights with prices, times, airlines, and layovers] User preferences: morning departure, max 1 layover."

The client initiates the sampling request, allowing the AI to evaluate trade-offs—like cheaper red-eye flights versus convenient morning departures. The tool uses this analysis to present the top three recommendations.

#### User Interaction Model

While not a requirement, sampling is designed to allow human-in-the-loop control. Users can maintain oversight through several mechanisms:

**Approval controls**: Sampling requests may require explicit user consent. Clients can show what the server wants to analyze and why. Users can approve, deny, or modify requests.

**Transparency features**: Clients can display the exact prompt, model selection, and token limits, allowing users to review AI responses before they return to the server.

**Configuration options**: Users can set model preferences, configure auto-approval for trusted operations, or require approval for everything. Clients may provide options to redact sensitive information.

**Security considerations**: Both clients and servers must handle sensitive data appropriately during sampling. Clients should implement rate limiting and validate all message content. The human-in-the-loop design ensures that server-initiated AI interactions cannot compromise security or access sensitive data without explicit user consent.


# Understanding MCP servers
Source: https://modelcontextprotocol.io/docs/learn/server-concepts



MCP servers are programs that expose specific capabilities to AI applications through standardized protocol interfaces.

Common examples include file system servers for document access, database servers for data queries, GitHub servers for code management, Slack servers for team communication, and calendar servers for scheduling.

## Core Server Features

Servers provide functionality through three building blocks:

| Feature       | Explanation                                                                                                                                                                             | Examples                                                           | Who controls it |
| ------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------ | --------------- |
| **Tools**     | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or trigger other logic. | Search flights<br />Send messages<br />Create calendar events      | Model           |
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation.                                           | Retrieve documents<br />Access knowledge bases<br />Read calendars | Application     |
| **Prompts**   | Pre-built instruction templates that tell the model to work with specific tools and resources.                                                                                          | Plan a vacation<br />Summarize my meetings<br />Draft an email     | User            |

We will use a hypothetical scenario to demonstrate the role of each of these features, and show how they can work together.

### Tools

Tools enable AI models to perform actions. Each tool defines a specific operation with typed inputs and outputs. The model requests tool execution based on context.

#### How Tools Work

Tools are schema-defined interfaces that LLMs can invoke. MCP uses JSON Schema for validation. Each tool performs a single operation with clearly defined inputs and outputs. Tools may require user consent prior to execution, helping to ensure users maintain control over actions taken by a model.

**Protocol operations:**

| Method       | Purpose                  | Returns                                |
| ------------ | ------------------------ | -------------------------------------- |
| `tools/list` | Discover available tools | Array of tool definitions with schemas |
| `tools/call` | Execute a specific tool  | Tool execution result                  |

**Example tool definition:**

```typescript
{
  name: "searchFlights",
  description: "Search for available flights",
  inputSchema: {
    type: "object",
    properties: {
      origin: { type: "string", description: "Departure city" },
      destination: { type: "string", description: "Arrival city" },
      date: { type: "string", format: "date", description: "Travel date" }
    },
    required: ["origin", "destination", "date"]
  }
}
```

#### Example: Travel Booking

Tools enable AI applications to perform actions on behalf of users. In a travel planning scenario, the AI application might use several tools to help book a vacation:

**Flight Search**

```
searchFlights(origin: "NYC", destination: "Barcelona", date: "2024-06-15")
```

Queries multiple airlines and returns structured flight options.

**Calendar Blocking**

```
createCalendarEvent(title: "Barcelona Trip", startDate: "2024-06-15", endDate: "2024-06-22")
```

Marks the travel dates in the user's calendar.

**Email notification**

```
sendEmail(to: "team@work.com", subject: "Out of Office", body: "...")
```

Sends an automated out-of-office message to colleagues.

#### User Interaction Model

Tools are model-controlled, meaning AI models can discover and invoke them automatically. However, MCP emphasizes human oversight through several mechanisms.

For trust and safety, applications can implement user control through various mechanisms, such as:

* Displaying available tools in the UI, enabling users to define whether a tool should be made available in specific interactions
* Approval dialogs for individual tool executions
* Permission settings for pre-approving certain safe operations
* Activity logs that show all tool executions with their results

### Resources

Resources provide structured access to information that the AI application can retrieve and provide to models as context.

#### How Resources Work

Resources expose data from files, APIs, databases, or any other source that an AI needs to understand context. Applications can access this information directly and decide how to use it - whether that's selecting relevant portions, searching with embeddings, or passing it all to the model.

Each resource has a unique URI (like `file:///path/to/document.md`) and declares its MIME type for appropriate content handling. They declare MIME types for appropriate content handling and support two discovery patterns:

* **Direct Resources** - fixed URIs that point to specific data. Example: `calendar://events/2024` - returns calendar availability for 2024
* **Resource Templates** - dynamic URIs with parameters for flexible queries. Example:
  * `travel://activities/{city}/{category}` - returns activities by city and category
  * `travel://activities/barcelona/museums` - returns all museums in Barcelona

Resource Templates include metadata such as title, description, and expected MIME type, making them discoverable and self-documenting.

**Protocol operations:**

| Method                     | Purpose                         | Returns                                |
| -------------------------- | ------------------------------- | -------------------------------------- |
| `resources/list`           | List available direct resources | Array of resource descriptors          |
| `resources/templates/list` | Discover resource templates     | Array of resource template definitions |
| `resources/read`           | Retrieve resource contents      | Resource data with metadata            |
| `resources/subscribe`      | Monitor resource changes        | Subscription confirmation              |

#### Example: Getting Travel Planning Context

Continuing with the travel planning example, resources provide the AI application with access to relevant information:

* **Calendar data** (`calendar://events/2024`) - Checks user availability
* **Travel documents** (`file:///Documents/Travel/passport.pdf`) - Accesses important documents
* **Previous itineraries** (`trips://history/barcelona-2023`) - References past trips and preferences

The AI application retrieves these resources and decides how to process them, whether selecting a subset of data using embeddings or keyword search, or passing raw data directly to the model.

In this case, it provides calendar data, weather information, and travel preferences to the model, enabling it to check availability, look up weather patterns, and reference past travel preferences.

**Resource Template Examples:**

```json
{
  "uriTemplate": "weather://forecast/{city}/{date}",
  "name": "weather-forecast",
  "title": "Weather Forecast",
  "description": "Get weather forecast for any city and date",
  "mimeType": "application/json"
}

{
  "uriTemplate": "travel://flights/{origin}/{destination}",
  "name": "flight-search",
  "title": "Flight Search",
  "description": "Search available flights between cities",
  "mimeType": "application/json"
}
```

These templates enable flexible queries. For weather data, users can access forecasts for any city/date combination. For flights, they can search routes between any two airports. When a user has input "NYC" as the `origin` airport and begins to input "Bar" as the `destination` airport, the system can suggest "Barcelona (BCN)" or "Barbados (BGI)".

#### Parameter Completion

Dynamic resources support parameter completion. For example:

* Typing "Par" as input for `weather://forecast/{city}` might suggest "Paris" or "Park City"
* Typing "JFK" for `flights://search/{airport}` might suggest "JFK - John F. Kennedy International"

The system helps discover valid values without requiring exact format knowledge.

#### User Interaction Model

Resources are application-driven, giving them flexibility in how they retrieve, process, and present available context. Common interaction patterns include:

* Tree or list views for browsing resources in familiar folder-like structures
* Search and filter interfaces for finding specific resources
* Automatic context inclusion or smart suggestions based on heuristics or AI selection
* Manual or bulk selection interfaces for including single or multiple resources

Applications are free to implement resource discovery through any interface pattern that suits their needs. The protocol doesn't mandate specific UI patterns, allowing for resource pickers with preview capabilities, smart suggestions based on current conversation context, bulk selection for including multiple resources, or integration with existing file browsers and data explorers.

### Prompts

Prompts provide reusable templates. They allow MCP server authors to provide parameterized prompts for a domain, or showcase how to best use the MCP server.

#### How Prompts Work

Prompts are structured templates that define expected inputs and interaction patterns. They are user-controlled, requiring explicit invocation rather than automatic triggering. Prompts can be context-aware, referencing available resources and tools to create comprehensive workflows. Similar to resources, prompts support parameter completion to help users discover valid argument values.

**Protocol operations:**

| Method         | Purpose                    | Returns                               |
| -------------- | -------------------------- | ------------------------------------- |
| `prompts/list` | Discover available prompts | Array of prompt descriptors           |
| `prompts/get`  | Retrieve prompt details    | Full prompt definition with arguments |

#### Example: Streamlined Workflows

Prompts provide structured templates for common tasks. In the travel planning context:

**"Plan a vacation" prompt:**

```json
{
  "name": "plan-vacation",
  "title": "Plan a vacation",
  "description": "Guide through vacation planning process",
  "arguments": [
    { "name": "destination", "type": "string", "required": true },
    { "name": "duration", "type": "number", "description": "days" },
    { "name": "budget", "type": "number", "required": false },
    { "name": "interests", "type": "array", "items": { "type": "string" } }
  ]
}
```

Rather than unstructured natural language input, the prompt system enables:

1. Selection of the "Plan a vacation" template
2. Structured input: Barcelona, 7 days, \$3000, \["beaches", "architecture", "food"]
3. Consistent workflow execution based on the template

#### User Interaction Model

Prompts are user-controlled, requiring explicit invocation. The protocol gives implementers freedom to design interfaces that feel natural within their application. Key principles include:

* Easy discovery of available prompts
* Clear descriptions of what each prompt does
* Natural argument input with validation
* Transparent display of the prompt's underlying template

Applications typically expose prompts through various UI patterns such as:

* Slash commands (typing "/" to see available prompts like /plan-vacation)
* Command palettes for searchable access
* Dedicated UI buttons for frequently used prompts
* Context menus that suggest relevant prompts

## Bringing Servers Together

The real power of MCP emerges when multiple servers work together, combining their specialized capabilities through a unified interface.

### Example: Multi-Server Travel Planning

Consider a personalized AI travel planner application, with three connected servers:

* **Travel Server** - Handles flights, hotels, and itineraries
* **Weather Server** - Provides climate data and forecasts
* **Calendar/Email Server** - Manages schedules and communications

#### The Complete Flow

1. **User invokes a prompt with parameters:**

   ```json
   {
     "prompt": "plan-vacation",
     "arguments": {
       "destination": "Barcelona",
       "departure_date": "2024-06-15",
       "return_date": "2024-06-22",
       "budget": 3000,
       "travelers": 2
     }
   }
   ```

2. **User selects resources to include:**
   * `calendar://my-calendar/June-2024` (from Calendar Server)
   * `travel://preferences/europe` (from Travel Server)
   * `travel://past-trips/Spain-2023` (from Travel Server)

3. **AI processes the request using tools:**

   The AI first reads all selected resources to gather context - identifying available dates from the calendar, learning preferred airlines and hotel types from travel preferences, and discovering previously enjoyed locations from past trips.

   Using this context, the AI then executes a series of Tools:

   * `searchFlights()` - Queries airlines for NYC to Barcelona flights
   * `checkWeather()` - Retrieves climate forecasts for travel dates

   The AI then uses this information to create the booking and following steps, requesting approval from the user where necessary:

   * `bookHotel()` - Finds hotels within the specified budget
   * `createCalendarEvent()` - Adds the trip to the user's calendar
   * `sendEmail()` - Sends confirmation with trip details

**The result:** Through multiple MCP servers, the user researched and booked a Barcelona trip tailored to their schedule. The "Plan a Vacation" prompt guided the AI to combine Resources (calendar availability and travel history) with Tools (searching flights, booking hotels, updating calendars) across different servers—gathering context and executing the booking. A task that could've taken hours was completed in minutes using MCP.


# SDKs
Source: https://modelcontextprotocol.io/docs/sdk

Official SDKs for building with Model Context Protocol

Build MCP servers and clients using our official SDKs. All SDKs provide the same core functionality and full protocol support.

## Available SDKs

<CardGroup cols={3}>
  <Card title="TypeScript" icon="square-js" href="https://github.com/modelcontextprotocol/typescript-sdk" />

  <Card title="Python" icon="python" href="https://github.com/modelcontextprotocol/python-sdk" />

  <Card title="Go" icon="golang" href="https://github.com/modelcontextprotocol/go-sdk" />

  <Card title="Kotlin" icon="square-k" href="https://github.com/modelcontextprotocol/kotlin-sdk" />

  <Card title="Swift" icon="swift" href="https://github.com/modelcontextprotocol/swift-sdk" />

  <Card title="Java" icon="java" href="https://github.com/modelcontextprotocol/java-sdk" />

  <Card title="C#" icon="square-c" href="https://github.com/modelcontextprotocol/csharp-sdk" />

  <Card title="Ruby" icon="gem" href="https://github.com/modelcontextprotocol/ruby-sdk" />

  <Card title="Rust" icon="rust" href="https://github.com/modelcontextprotocol/rust-sdk" />

  <Card title="PHP" icon="php" href="https://github.com/modelcontextprotocol/php-sdk" />
</CardGroup>

## Getting Started

Each SDK provides the same functionality but follows the idioms and best practices of its language. All SDKs support:

* Creating MCP servers that expose tools, resources, and prompts
* Building MCP clients that can connect to any MCP server
* Local and remote transport protocols
* Protocol compliance with type safety

Visit the SDK page for your chosen language to find installation instructions, documentation, and examples.

## Next Steps

Ready to start building with MCP? Choose your path:

<CardGroup cols={2}>
  <Card title="Build a Server" icon="server" href="/docs/develop/build-server">
    Learn how to create your first MCP server
  </Card>

  <Card title="Build a Client" icon="computer" href="/docs/develop/build-client">
    Create applications that connect to MCP servers
  </Card>
</CardGroup>


# MCP Inspector
Source: https://modelcontextprotocol.io/docs/tools/inspector

In-depth guide to using the MCP Inspector for testing and debugging Model Context Protocol servers

The [MCP Inspector](https://github.com/modelcontextprotocol/inspector) is an interactive developer tool for testing and debugging MCP servers. While the [Debugging Guide](/legacy/tools/debugging) covers the Inspector as part of the overall debugging toolkit, this document provides a detailed exploration of the Inspector's features and capabilities.

## Getting started

### Installation and basic usage

The Inspector runs directly through `npx` without requiring installation:

```bash
npx @modelcontextprotocol/inspector <command>
```

```bash
npx @modelcontextprotocol/inspector <command> <arg1> <arg2>
```

#### Inspecting servers from NPM or PyPi

A common way to start server packages from [NPM](https://npmjs.com) or [PyPi](https://pypi.org).

<Tabs>
  <Tab title="NPM package">
    ```bash
    npx -y @modelcontextprotocol/inspector npx <package-name> <args>
    # For example
    npx -y @modelcontextprotocol/inspector npx @modelcontextprotocol/server-filesystem /Users/username/Desktop
    ```
  </Tab>

  <Tab title="PyPi package">
    ```bash
    npx @modelcontextprotocol/inspector uvx <package-name> <args>
    # For example
    npx @modelcontextprotocol/inspector uvx mcp-server-git --repository ~/code/mcp/servers.git
    ```
  </Tab>
</Tabs>

#### Inspecting locally developed servers

To inspect servers locally developed or downloaded as a repository, the most common
way is:

<Tabs>
  <Tab title="TypeScript">
    ```bash
    npx @modelcontextprotocol/inspector node path/to/server/index.js args...
    ```
  </Tab>

  <Tab title="Python">
    ```bash
    npx @modelcontextprotocol/inspector \
      uv \
      --directory path/to/server \
      run \
      package-name \
      args...
    ```
  </Tab>
</Tabs>

Please carefully read any attached README for the most accurate instructions.

## Feature overview

<Frame caption="The MCP Inspector interface">
  <img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-inspector.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=83b12e2a457c96ef4ad17c7357236290" data-og-width="2888" width="2888" data-og-height="1761" height="1761" data-path="images/mcp-inspector.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-inspector.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=63e7263fbdf5f473064f37dac99ae8e5 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-inspector.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=78dcf971172e8790fc672f19ead2796d 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-inspector.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=8c4ce11c7901888cd967f461df66a0f3 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-inspector.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=279b84d4729737f1241514cb30de3b40 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-inspector.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=ac5dcc45e291ba2f2954d3a22c918029 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/images/mcp-inspector.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=4fbcddae467e84daef4739e0816ab698 2500w" data-optimize="true" data-opv="2" />
</Frame>

The Inspector provides several features for interacting with your MCP server:

### Server connection pane

* Allows selecting the [transport](/legacy/concepts/transports) for connecting to the server
* For local servers, supports customizing the command-line arguments and environment

### Resources tab

* Lists all available resources
* Shows resource metadata (MIME types, descriptions)
* Allows resource content inspection
* Supports subscription testing

### Prompts tab

* Displays available prompt templates
* Shows prompt arguments and descriptions
* Enables prompt testing with custom arguments
* Previews generated messages

### Tools tab

* Lists available tools
* Shows tool schemas and descriptions
* Enables tool testing with custom inputs
* Displays tool execution results

### Notifications pane

* Presents all logs recorded from the server
* Shows notifications received from the server

## Best practices

### Development workflow

1. Start Development
   * Launch Inspector with your server
   * Verify basic connectivity
   * Check capability negotiation

2. Iterative testing
   * Make server changes
   * Rebuild the server
   * Reconnect the Inspector
   * Test affected features
   * Monitor messages

3. Test edge cases
   * Invalid inputs
   * Missing prompt arguments
   * Concurrent operations
   * Verify error handling and error responses

## Next steps

<CardGroup cols={2}>
  <Card title="Inspector Repository" icon="github" href="https://github.com/modelcontextprotocol/inspector">
    Check out the MCP Inspector source code
  </Card>

  <Card title="Debugging Guide" icon="bug" href="/legacy/tools/debugging">
    Learn about broader debugging strategies
  </Card>
</CardGroup>


# Example Servers
Source: https://modelcontextprotocol.io/examples

A list of example servers and implementations

This page showcases various Model Context Protocol (MCP) servers that demonstrate the protocol's capabilities and versatility. These servers enable Large Language Models (LLMs) to securely access tools and data sources.

## Reference implementations

These official reference servers demonstrate core MCP features and SDK usage:

### Current reference servers

* **[Everything](https://github.com/modelcontextprotocol/servers/tree/main/src/everything)** - Reference / test server with prompts, resources, and tools
* **[Fetch](https://github.com/modelcontextprotocol/servers/tree/main/src/fetch)** - Web content fetching and conversion for efficient LLM usage
* **[Filesystem](https://github.com/modelcontextprotocol/servers/tree/main/src/filesystem)** - Secure file operations with configurable access controls
* **[Git](https://github.com/modelcontextprotocol/servers/tree/main/src/git)** - Tools to read, search, and manipulate Git repositories
* **[Memory](https://github.com/modelcontextprotocol/servers/tree/main/src/memory)** - Knowledge graph-based persistent memory system
* **[Sequential Thinking](https://github.com/modelcontextprotocol/servers/tree/main/src/sequentialthinking)** - Dynamic and reflective problem-solving through thought sequences
* **[Time](https://github.com/modelcontextprotocol/servers/tree/main/src/time)** - Time and timezone conversion capabilities

### Archived servers (historical reference)

⚠️ **Note**: The following servers have been moved to the [servers-archived repository](https://github.com/modelcontextprotocol/servers-archived) and are no longer actively maintained. They are provided for historical reference only.

#### Data and file systems

* **[PostgreSQL](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/postgres)** - Read-only database access with schema inspection capabilities
* **[SQLite](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/sqlite)** - Database interaction and business intelligence features
* **[Google Drive](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/gdrive)** - File access and search capabilities for Google Drive

#### Development tools

* **[Git](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/git)** - Tools to read, search, and manipulate Git repositories
* **[GitHub](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/github)** - Repository management, file operations, and GitHub API integration
* **[GitLab](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/gitlab)** - GitLab API integration enabling project management
* **[Sentry](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/sentry)** - Retrieving and analyzing issues from Sentry.io

#### Web and browser automation

* **[Brave Search](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/brave-search)** - Web and local search using Brave's Search API
* **[Puppeteer](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/puppeteer)** - Browser automation and web scraping capabilities

#### Productivity and communication

* **[Slack](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/slack)** - Channel management and messaging capabilities
* **[Google Maps](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/google-maps)** - Location services, directions, and place details

#### AI and specialized tools

* **[EverArt](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/everart)** - AI image generation using various models
* **[AWS KB Retrieval](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/aws-kb-retrieval-server)** - Retrieval from AWS Knowledge Base using Bedrock Agent Runtime

## Official integrations

Visit the [MCP Servers Repository (Official Integrations section)](https://github.com/modelcontextprotocol/servers?tab=readme-ov-file#%EF%B8%8F-official-integrations) for a list of MCP servers maintained by companies for their platforms.

## Community implementations

Visit the [MCP Servers Repository (Community section)](https://github.com/modelcontextprotocol/servers?tab=readme-ov-file#-community-servers) for a list of MCP servers maintained by community members.

## Getting started

### Using reference servers

TypeScript-based servers can be used directly with `npx`:

```bash
npx -y @modelcontextprotocol/server-memory
```

Python-based servers can be used with `uvx` (recommended) or `pip`:

```bash
# Using uvx
uvx mcp-server-git

# Using pip
pip install mcp-server-git
python -m mcp_server_git
```

### Configuring with Claude

To use an MCP server with Claude, add it to your configuration:

```json
{
  "mcpServers": {
    "memory": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-memory"]
    },
    "filesystem": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "/path/to/allowed/files"
      ]
    },
    "github": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-github"],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "<YOUR_TOKEN>"
      }
    }
  }
}
```

## Additional resources

Visit the [MCP Servers Repository (Resources section)](https://github.com/modelcontextprotocol/servers?tab=readme-ov-file#-resources) for a collection of other resources and projects related to MCP.

Visit our [GitHub Discussions](https://github.com/orgs/modelcontextprotocol/discussions) to engage with the MCP community.


# Architecture
Source: https://modelcontextprotocol.io/specification/2025-06-18/architecture/index



<div id="enable-section-numbers" />

The Model Context Protocol (MCP) follows a client-host-server architecture where each
host can run multiple client instances. This architecture enables users to integrate AI
capabilities across applications while maintaining clear security boundaries and
isolating concerns. Built on JSON-RPC, MCP provides a stateful session protocol focused
on context exchange and sampling coordination between clients and servers.

## Core Components

```mermaid
graph LR
    subgraph "Application Host Process"
        H[Host]
        C1[Client 1]
        C2[Client 2]
        C3[Client 3]
        H --> C1
        H --> C2
        H --> C3
    end

    subgraph "Local machine"
        S1[Server 1<br>Files & Git]
        S2[Server 2<br>Database]
        R1[("Local<br>Resource A")]
        R2[("Local<br>Resource B")]

        C1 --> S1
        C2 --> S2
        S1 <--> R1
        S2 <--> R2
    end

    subgraph "Internet"
        S3[Server 3<br>External APIs]
        R3[("Remote<br>Resource C")]

        C3 --> S3
        S3 <--> R3
    end
```

### Host

The host process acts as the container and coordinator:

* Creates and manages multiple client instances
* Controls client connection permissions and lifecycle
* Enforces security policies and consent requirements
* Handles user authorization decisions
* Coordinates AI/LLM integration and sampling
* Manages context aggregation across clients

### Clients

Each client is created by the host and maintains an isolated server connection:

* Establishes one stateful session per server
* Handles protocol negotiation and capability exchange
* Routes protocol messages bidirectionally
* Manages subscriptions and notifications
* Maintains security boundaries between servers

A host application creates and manages multiple clients, with each client having a 1:1
relationship with a particular server.

### Servers

Servers provide specialized context and capabilities:

* Expose resources, tools and prompts via MCP primitives
* Operate independently with focused responsibilities
* Request sampling through client interfaces
* Must respect security constraints
* Can be local processes or remote services

## Design Principles

MCP is built on several key design principles that inform its architecture and
implementation:

1. **Servers should be extremely easy to build**
   * Host applications handle complex orchestration responsibilities
   * Servers focus on specific, well-defined capabilities
   * Simple interfaces minimize implementation overhead
   * Clear separation enables maintainable code

2. **Servers should be highly composable**
   * Each server provides focused functionality in isolation
   * Multiple servers can be combined seamlessly
   * Shared protocol enables interoperability
   * Modular design supports extensibility

3. **Servers should not be able to read the whole conversation, nor "see into" other
   servers**
   * Servers receive only necessary contextual information
   * Full conversation history stays with the host
   * Each server connection maintains isolation
   * Cross-server interactions are controlled by the host
   * Host process enforces security boundaries

4. **Features can be added to servers and clients progressively**
   * Core protocol provides minimal required functionality
   * Additional capabilities can be negotiated as needed
   * Servers and clients evolve independently
   * Protocol designed for future extensibility
   * Backwards compatibility is maintained

## Capability Negotiation

The Model Context Protocol uses a capability-based negotiation system where clients and
servers explicitly declare their supported features during initialization. Capabilities
determine which protocol features and primitives are available during a session.

* Servers declare capabilities like resource subscriptions, tool support, and prompt
  templates
* Clients declare capabilities like sampling support and notification handling
* Both parties must respect declared capabilities throughout the session
* Additional capabilities can be negotiated through extensions to the protocol

```mermaid
sequenceDiagram
    participant Host
    participant Client
    participant Server

    Host->>+Client: Initialize client
    Client->>+Server: Initialize session with capabilities
    Server-->>Client: Respond with supported capabilities

    Note over Host,Server: Active Session with Negotiated Features

    loop Client Requests
        Host->>Client: User- or model-initiated action
        Client->>Server: Request (tools/resources)
        Server-->>Client: Response
        Client-->>Host: Update UI or respond to model
    end

    loop Server Requests
        Server->>Client: Request (sampling)
        Client->>Host: Forward to AI
        Host-->>Client: AI response
        Client-->>Server: Response
    end

    loop Notifications
        Server--)Client: Resource updates
        Client--)Server: Status changes
    end

    Host->>Client: Terminate
    Client->>-Server: End session
    deactivate Server
```

Each capability unlocks specific protocol features for use during the session. For
example:

* Implemented [server features](/specification/2025-06-18/server) must be advertised in the
  server's capabilities
* Emitting resource subscription notifications requires the server to declare
  subscription support
* Tool invocation requires the server to declare tool capabilities
* [Sampling](/specification/2025-06-18/client) requires the client to declare support in its
  capabilities

This capability negotiation ensures clients and servers have a clear understanding of
supported functionality while maintaining protocol extensibility.


# Authorization
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/authorization



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

## Introduction

### Purpose and Scope

The Model Context Protocol provides authorization capabilities at the transport level,
enabling MCP clients to make requests to restricted MCP servers on behalf of resource
owners. This specification defines the authorization flow for HTTP-based transports.

### Protocol Requirements

Authorization is **OPTIONAL** for MCP implementations. When supported:

* Implementations using an HTTP-based transport **SHOULD** conform to this specification.
* Implementations using an STDIO transport **SHOULD NOT** follow this specification, and
  instead retrieve credentials from the environment.
* Implementations using alternative transports **MUST** follow established security best
  practices for their protocol.

### Standards Compliance

This authorization mechanism is based on established specifications listed below, but
implements a selected subset of their features to ensure security and interoperability
while maintaining simplicity:

* OAuth 2.1 IETF DRAFT ([draft-ietf-oauth-v2-1-13](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13))
* OAuth 2.0 Authorization Server Metadata
  ([RFC8414](https://datatracker.ietf.org/doc/html/rfc8414))
* OAuth 2.0 Dynamic Client Registration Protocol
  ([RFC7591](https://datatracker.ietf.org/doc/html/rfc7591))
* OAuth 2.0 Protected Resource Metadata ([RFC9728](https://datatracker.ietf.org/doc/html/rfc9728))

## Authorization Flow

### Roles

A protected *MCP server* acts as an [OAuth 2.1 resource server](https://www.ietf.org/archive/id/draft-ietf-oauth-v2-1-13.html#name-roles),
capable of accepting and responding to protected resource requests using access tokens.

An *MCP client* acts as an [OAuth 2.1 client](https://www.ietf.org/archive/id/draft-ietf-oauth-v2-1-13.html#name-roles),
making protected resource requests on behalf of a resource owner.

The *authorization server* is responsible for interacting with the user (if necessary) and issuing access tokens for use at the MCP server.
The implementation details of the authorization server are beyond the scope of this specification. It may be hosted with the
resource server or a separate entity. The [Authorization Server Discovery section](#authorization-server-discovery)
specifies how an MCP server indicates the location of its corresponding authorization server to a client.

### Overview

1. Authorization servers **MUST** implement OAuth 2.1 with appropriate security
   measures for both confidential and public clients.

2. Authorization servers and MCP clients **SHOULD** support the OAuth 2.0 Dynamic Client Registration
   Protocol ([RFC7591](https://datatracker.ietf.org/doc/html/rfc7591)).

3. MCP servers **MUST** implement OAuth 2.0 Protected Resource Metadata ([RFC9728](https://datatracker.ietf.org/doc/html/rfc9728)).
   MCP clients **MUST** use OAuth 2.0 Protected Resource Metadata for authorization server discovery.

4. Authorization servers **MUST** provide OAuth 2.0 Authorization
   Server Metadata ([RFC8414](https://datatracker.ietf.org/doc/html/rfc8414)).
   MCP clients **MUST** use the OAuth 2.0 Authorization Server Metadata.

### Authorization Server Discovery

This section describes the mechanisms by which MCP servers advertise their associated
authorization servers to MCP clients, as well as the discovery process through which MCP
clients can determine authorization server endpoints and supported capabilities.

#### Authorization Server Location

MCP servers **MUST** implement the OAuth 2.0 Protected Resource Metadata ([RFC9728](https://datatracker.ietf.org/doc/html/rfc9728))
specification to indicate the locations of authorization servers. The Protected Resource Metadata document returned by the MCP server **MUST** include
the `authorization_servers` field containing at least one authorization server.

The specific use of `authorization_servers` is beyond the scope of this specification; implementers should consult
OAuth 2.0 Protected Resource Metadata ([RFC9728](https://datatracker.ietf.org/doc/html/rfc9728)) for
guidance on implementation details.

Implementors should note that Protected Resource Metadata documents can define multiple authorization servers. The responsibility for selecting which authorization server to use lies with the MCP client, following the guidelines specified in
[RFC9728 Section 7.6 "Authorization Servers"](https://datatracker.ietf.org/doc/html/rfc9728#name-authorization-servers).

MCP servers **MUST** use the HTTP header `WWW-Authenticate` when returning a *401 Unauthorized* to indicate the location of the resource server metadata URL
as described in [RFC9728 Section 5.1 "WWW-Authenticate Response"](https://datatracker.ietf.org/doc/html/rfc9728#name-www-authenticate-response).

MCP clients **MUST** be able to parse `WWW-Authenticate` headers and respond appropriately to `HTTP 401 Unauthorized` responses from the MCP server.

#### Server Metadata Discovery

MCP clients **MUST** follow the OAuth 2.0 Authorization Server Metadata [RFC8414](https://datatracker.ietf.org/doc/html/rfc8414)
specification to obtain the information required to interact with the authorization server.

#### Sequence Diagram

The following diagram outlines an example flow:

```mermaid
sequenceDiagram
    participant C as Client
    participant M as MCP Server (Resource Server)
    participant A as Authorization Server

    C->>M: MCP request without token
    M-->>C: HTTP 401 Unauthorized with WWW-Authenticate header
    Note over C: Extract resource_metadata<br />from WWW-Authenticate

    C->>M: GET /.well-known/oauth-protected-resource
    M-->>C: Resource metadata with authorization server URL
    Note over C: Validate RS metadata,<br />build AS metadata URL

    C->>A: GET /.well-known/oauth-authorization-server
    A-->>C: Authorization server metadata

    Note over C,A: OAuth 2.1 authorization flow happens here

    C->>A: Token request
    A-->>C: Access token

    C->>M: MCP request with access token
    M-->>C: MCP response
    Note over C,M: MCP communication continues with valid token
```

### Dynamic Client Registration

MCP clients and authorization servers **SHOULD** support the
OAuth 2.0 Dynamic Client Registration Protocol [RFC7591](https://datatracker.ietf.org/doc/html/rfc7591)
to allow MCP clients to obtain OAuth client IDs without user interaction. This provides a
standardized way for clients to automatically register with new authorization servers, which is crucial
for MCP because:

* Clients may not know all possible MCP servers and their authorization servers in advance.
* Manual registration would create friction for users.
* It enables seamless connection to new MCP servers and their authorization servers.
* Authorization servers can implement their own registration policies.

Any authorization servers that *do not* support Dynamic Client Registration need to provide
alternative ways to obtain a client ID (and, if applicable, client credentials). For one of
these authorization servers, MCP clients will have to either:

1. Hardcode a client ID (and, if applicable, client credentials) specifically for the MCP client to use when
   interacting with that authorization server, or
2. Present a UI to users that allows them to enter these details, after registering an
   OAuth client themselves (e.g., through a configuration interface hosted by the
   server).

### Authorization Flow Steps

The complete Authorization flow proceeds as follows:

```mermaid
sequenceDiagram
    participant B as User-Agent (Browser)
    participant C as Client
    participant M as MCP Server (Resource Server)
    participant A as Authorization Server

    C->>M: MCP request without token
    M->>C: HTTP 401 Unauthorized with WWW-Authenticate header
    Note over C: Extract resource_metadata URL from WWW-Authenticate

    C->>M: Request Protected Resource Metadata
    M->>C: Return metadata

    Note over C: Parse metadata and extract authorization server(s)<br/>Client determines AS to use

    C->>A: GET /.well-known/oauth-authorization-server
    A->>C: Authorization server metadata response

    alt Dynamic client registration
        C->>A: POST /register
        A->>C: Client Credentials
    end

    Note over C: Generate PKCE parameters<br/>Include resource parameter
    C->>B: Open browser with authorization URL + code_challenge + resource
    B->>A: Authorization request with resource parameter
    Note over A: User authorizes
    A->>B: Redirect to callback with authorization code
    B->>C: Authorization code callback
    C->>A: Token request + code_verifier + resource
    A->>C: Access token (+ refresh token)
    C->>M: MCP request with access token
    M-->>C: MCP response
    Note over C,M: MCP communication continues with valid token
```

#### Resource Parameter Implementation

MCP clients **MUST** implement Resource Indicators for OAuth 2.0 as defined in [RFC 8707](https://www.rfc-editor.org/rfc/rfc8707.html)
to explicitly specify the target resource for which the token is being requested. The `resource` parameter:

1. **MUST** be included in both authorization requests and token requests.
2. **MUST** identify the MCP server that the client intends to use the token with.
3. **MUST** use the canonical URI of the MCP server as defined in [RFC 8707 Section 2](https://www.rfc-editor.org/rfc/rfc8707.html#name-access-token-request).

##### Canonical Server URI

For the purposes of this specification, the canonical URI of an MCP server is defined as the resource identifier as specified in
[RFC 8707 Section 2](https://www.rfc-editor.org/rfc/rfc8707.html#section-2) and aligns with the `resource` parameter in
[RFC 9728](https://datatracker.ietf.org/doc/html/rfc9728).

MCP clients **SHOULD** provide the most specific URI that they can for the MCP server they intend to access, following the guidance in [RFC 8707](https://www.rfc-editor.org/rfc/rfc8707). While the canonical form uses lowercase scheme and host components, implementations **SHOULD** accept uppercase scheme and host components for robustness and interoperability.

Examples of valid canonical URIs:

* `https://mcp.example.com/mcp`
* `https://mcp.example.com`
* `https://mcp.example.com:8443`
* `https://mcp.example.com/server/mcp` (when path component is necessary to identify individual MCP server)

Examples of invalid canonical URIs:

* `mcp.example.com` (missing scheme)
* `https://mcp.example.com#fragment` (contains fragment)

> **Note:** While both `https://mcp.example.com/` (with trailing slash) and `https://mcp.example.com` (without trailing slash) are technically valid absolute URIs according to [RFC 3986](https://www.rfc-editor.org/rfc/rfc3986), implementations **SHOULD** consistently use the form without the trailing slash for better interoperability unless the trailing slash is semantically significant for the specific resource.

For example, if accessing an MCP server at `https://mcp.example.com`, the authorization request would include:

```
&resource=https%3A%2F%2Fmcp.example.com
```

MCP clients **MUST** send this parameter regardless of whether authorization servers support it.

### Access Token Usage

#### Token Requirements

Access token handling when making requests to MCP servers **MUST** conform to the requirements defined in
[OAuth 2.1 Section 5 "Resource Requests"](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-5).
Specifically:

1. MCP client **MUST** use the Authorization request header field defined in
   [OAuth 2.1 Section 5.1.1](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-5.1.1):

```
Authorization: Bearer <access-token>
```

Note that authorization **MUST** be included in every HTTP request from client to server,
even if they are part of the same logical session.

2. Access tokens **MUST NOT** be included in the URI query string

Example request:

```http
GET /mcp HTTP/1.1
Host: mcp.example.com
Authorization: Bearer eyJhbGciOiJIUzI1NiIs...
```

#### Token Handling

MCP servers, acting in their role as an OAuth 2.1 resource server, **MUST** validate access tokens as described in
[OAuth 2.1 Section 5.2](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-5.2).
MCP servers **MUST** validate that access tokens were issued specifically for them as the intended audience,
according to [RFC 8707 Section 2](https://www.rfc-editor.org/rfc/rfc8707.html#section-2).
If validation fails, servers **MUST** respond according to
[OAuth 2.1 Section 5.3](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-5.3)
error handling requirements. Invalid or expired tokens **MUST** receive a HTTP 401
response.

MCP clients **MUST NOT** send tokens to the MCP server other than ones issued by the MCP server's authorization server.

Authorization servers **MUST** only accept tokens that are valid for use with their
own resources.

MCP servers **MUST NOT** accept or transit any other tokens.

### Error Handling

Servers **MUST** return appropriate HTTP status codes for authorization errors:

| Status Code | Description  | Usage                                      |
| ----------- | ------------ | ------------------------------------------ |
| 401         | Unauthorized | Authorization required or token invalid    |
| 403         | Forbidden    | Invalid scopes or insufficient permissions |
| 400         | Bad Request  | Malformed authorization request            |

## Security Considerations

Implementations **MUST** follow OAuth 2.1 security best practices as laid out in [OAuth 2.1 Section 7. "Security Considerations"](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#name-security-considerations).

### Token Audience Binding and Validation

[RFC 8707](https://www.rfc-editor.org/rfc/rfc8707.html) Resource Indicators provide critical security benefits by binding tokens to their intended
audiences **when the Authorization Server supports the capability**. To enable current and future adoption:

* MCP clients **MUST** include the `resource` parameter in authorization and token requests as specified in the [Resource Parameter Implementation](#resource-parameter-implementation) section
* MCP servers **MUST** validate that tokens presented to them were specifically issued for their use

The [Security Best Practices document](/specification/2025-06-18/basic/security_best_practices#token-passthrough)
outlines why token audience validation is crucial and why token passthrough is explicitly forbidden.

### Token Theft

Attackers who obtain tokens stored by the client, or tokens cached or logged on the server can access protected resources with
requests that appear legitimate to resource servers.

Clients and servers **MUST** implement secure token storage and follow OAuth best practices,
as outlined in [OAuth 2.1, Section 7.1](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-7.1).

Authorization servers **SHOULD** issue short-lived access tokens to reduce the impact of leaked tokens.
For public clients, authorization servers **MUST** rotate refresh tokens as described in [OAuth 2.1 Section 4.3.1 "Token Endpoint Extension"](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-4.3.1).

### Communication Security

Implementations **MUST** follow [OAuth 2.1 Section 1.5 "Communication Security"](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-1.5).

Specifically:

1. All authorization server endpoints **MUST** be served over HTTPS.
2. All redirect URIs **MUST** be either `localhost` or use HTTPS.

### Authorization Code Protection

An attacker who has gained access to an authorization code contained in an authorization response can try to redeem the authorization code for an access token or otherwise make use of the authorization code.
(Further described in [OAuth 2.1 Section 7.5](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-7.5))

To mitigate this, MCP clients **MUST** implement PKCE according to [OAuth 2.1 Section 7.5.2](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-7.5.2).
PKCE helps prevent authorization code interception and injection attacks by requiring clients to create a secret verifier-challenge pair, ensuring that only the original requestor can exchange an authorization code for tokens.

### Open Redirection

An attacker may craft malicious redirect URIs to direct users to phishing sites.

MCP clients **MUST** have redirect URIs registered with the authorization server.

Authorization servers **MUST** validate exact redirect URIs against pre-registered values to prevent redirection attacks.

MCP clients **SHOULD** use and verify state parameters in the authorization code flow
and discard any results that do not include or have a mismatch with the original state.

Authorization servers **MUST** take precautions to prevent redirecting user agents to untrusted URI's, following suggestions laid out in [OAuth 2.1 Section 7.12.2](https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-13#section-7.12.2)

Authorization servers **SHOULD** only automatically redirect the user agent if it trusts the redirection URI. If the URI is not trusted, the authorization server MAY inform the user and rely on the user to make the correct decision.

### Confused Deputy Problem

Attackers can exploit MCP servers acting as intermediaries to third-party APIs, leading to [confused deputy vulnerabilities](/specification/2025-06-18/basic/security_best_practices#confused-deputy-problem).
By using stolen authorization codes, they can obtain access tokens without user consent.

MCP proxy servers using static client IDs **MUST** obtain user consent for each dynamically
registered client before forwarding to third-party authorization servers (which may require additional consent).

### Access Token Privilege Restriction

An attacker can gain unauthorized access or otherwise compromise an MCP server if the server accepts tokens issued for other resources.

This vulnerability has two critical dimensions:

1. **Audience validation failures.** When an MCP server doesn't verify that tokens were specifically intended for it (for example, via the audience claim, as mentioned in [RFC9068](https://www.rfc-editor.org/rfc/rfc9068.html)), it may accept tokens originally issued for other services. This breaks a fundamental OAuth security boundary, allowing attackers to reuse legitimate tokens across different services than intended.
2. **Token passthrough.** If the MCP server not only accepts tokens with incorrect audiences but also forwards these unmodified tokens to downstream services, it can potentially cause the ["confused deputy" problem](#confused-deputy-problem), where the downstream API may incorrectly trust the token as if it came from the MCP server or assume the token was validated by the upstream API. See the [Token Passthrough section](/specification/2025-06-18/basic/security_best_practices#token-passthrough) of the Security Best Practices guide for additional details.

MCP servers **MUST** validate access tokens before processing the request, ensuring the access token is issued specifically for the MCP server, and take all necessary steps to ensure no data is returned to unauthorized parties.

A MCP server **MUST** follow the guidelines in [OAuth 2.1 - Section 5.2](https://www.ietf.org/archive/id/draft-ietf-oauth-v2-1-13.html#section-5.2) to validate inbound tokens.

MCP servers **MUST** only accept tokens specifically intended for themselves and **MUST** reject tokens that do not include them in the audience claim or otherwise verify that they are the intended recipient of the token. See the [Security Best Practices Token Passthrough section](/specification/2025-06-18/basic/security_best_practices#token-passthrough) for details.

If the MCP server makes requests to upstream APIs, it may act as an OAuth client to them. The access token used at the upstream API is a separate token, issued by the upstream authorization server. The MCP server **MUST NOT** pass through the token it received from the MCP client.

MCP clients **MUST** implement and use the `resource` parameter as defined in [RFC 8707 - Resource Indicators for OAuth 2.0](https://www.rfc-editor.org/rfc/rfc8707.html)
to explicitly specify the target resource for which the token is being requested. This requirement aligns with the recommendation in
[RFC 9728 Section 7.4](https://datatracker.ietf.org/doc/html/rfc9728#section-7.4). This ensures that access tokens are bound to their intended resources and
cannot be misused across different services.


# Overview
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/index



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol consists of several key components that work together:

* **Base Protocol**: Core JSON-RPC message types
* **Lifecycle Management**: Connection initialization, capability negotiation, and
  session control
* **Authorization**: Authentication and authorization framework for HTTP-based transports
* **Server Features**: Resources, prompts, and tools exposed by servers
* **Client Features**: Sampling and root directory lists provided by clients
* **Utilities**: Cross-cutting concerns like logging and argument completion

All implementations **MUST** support the base protocol and lifecycle management
components. Other components **MAY** be implemented based on the specific needs of the
application.

These protocol layers establish clear separation of concerns while enabling rich
interactions between clients and servers. The modular design allows implementations to
support exactly the features they need.

## Messages

All messages between MCP clients and servers **MUST** follow the
[JSON-RPC 2.0](https://www.jsonrpc.org/specification) specification. The protocol defines
these types of messages:

### Requests

Requests are sent from the client to the server or vice versa, to initiate an operation.

```typescript
{
  jsonrpc: "2.0";
  id: string | number;
  method: string;
  params?: {
    [key: string]: unknown;
  };
}
```

* Requests **MUST** include a string or integer ID.
* Unlike base JSON-RPC, the ID **MUST NOT** be `null`.
* The request ID **MUST NOT** have been previously used by the requestor within the same
  session.

### Responses

Responses are sent in reply to requests, containing the result or error of the operation.

```typescript
{
  jsonrpc: "2.0";
  id: string | number;
  result?: {
    [key: string]: unknown;
  }
  error?: {
    code: number;
    message: string;
    data?: unknown;
  }
}
```

* Responses **MUST** include the same ID as the request they correspond to.
* **Responses** are further sub-categorized as either **successful results** or
  **errors**. Either a `result` or an `error` **MUST** be set. A response **MUST NOT**
  set both.
* Results **MAY** follow any JSON object structure, while errors **MUST** include an
  error code and message at minimum.
* Error codes **MUST** be integers.

### Notifications

Notifications are sent from the client to the server or vice versa, as a one-way message.
The receiver **MUST NOT** send a response.

```typescript
{
  jsonrpc: "2.0";
  method: string;
  params?: {
    [key: string]: unknown;
  };
}
```

* Notifications **MUST NOT** include an ID.

## Auth

MCP provides an [Authorization](/specification/2025-06-18/basic/authorization) framework for use with HTTP.
Implementations using an HTTP-based transport **SHOULD** conform to this specification,
whereas implementations using STDIO transport **SHOULD NOT** follow this specification,
and instead retrieve credentials from the environment.

Additionally, clients and servers **MAY** negotiate their own custom authentication and
authorization strategies.

For further discussions and contributions to the evolution of MCP’s auth mechanisms, join
us in
[GitHub Discussions](https://github.com/modelcontextprotocol/specification/discussions)
to help shape the future of the protocol!

## Schema

The full specification of the protocol is defined as a
[TypeScript schema](https://github.com/modelcontextprotocol/specification/blob/main/schema/2025-06-18/schema.ts).
This is the source of truth for all protocol messages and structures.

There is also a
[JSON Schema](https://github.com/modelcontextprotocol/specification/blob/main/schema/2025-06-18/schema.json),
which is automatically generated from the TypeScript source of truth, for use with
various automated tooling.

### General fields

#### `_meta`

The `_meta` property/parameter is reserved by MCP to allow clients and servers
to attach additional metadata to their interactions.

Certain key names are reserved by MCP for protocol-level metadata, as specified below;
implementations MUST NOT make assumptions about values at these keys.

Additionally, definitions in the [schema](https://github.com/modelcontextprotocol/specification/blob/main/schema/2025-06-18/schema.ts)
may reserve particular names for purpose-specific metadata, as declared in those definitions.

**Key name format:** valid `_meta` key names have two segments: an optional **prefix**, and a **name**.

**Prefix:**

* If specified, MUST be a series of labels separated by dots (`.`), followed by a slash (`/`).
  * Labels MUST start with a letter and end with a letter or digit; interior characters can be letters, digits, or hyphens (`-`).
* Any prefix beginning with zero or more valid labels, followed by `modelcontextprotocol` or `mcp`, followed by any valid label,
  is **reserved** for MCP use.
  * For example: `modelcontextprotocol.io/`, `mcp.dev/`, `api.modelcontextprotocol.org/`, and `tools.mcp.com/` are all reserved.

**Name:**

* Unless empty, MUST begin and end with an alphanumeric character (`[a-z0-9A-Z]`).
* MAY contain hyphens (`-`), underscores (`_`), dots (`.`), and alphanumerics in between.


# Lifecycle
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/lifecycle



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) defines a rigorous lifecycle for client-server
connections that ensures proper capability negotiation and state management.

1. **Initialization**: Capability negotiation and protocol version agreement
2. **Operation**: Normal protocol communication
3. **Shutdown**: Graceful termination of the connection

```mermaid
sequenceDiagram
    participant Client
    participant Server

    Note over Client,Server: Initialization Phase
    activate Client
    Client->>+Server: initialize request
    Server-->>Client: initialize response
    Client--)Server: initialized notification

    Note over Client,Server: Operation Phase
    rect rgb(200, 220, 250)
        note over Client,Server: Normal protocol operations
    end

    Note over Client,Server: Shutdown
    Client--)-Server: Disconnect
    deactivate Server
    Note over Client,Server: Connection closed
```

## Lifecycle Phases

### Initialization

The initialization phase **MUST** be the first interaction between client and server.
During this phase, the client and server:

* Establish protocol version compatibility
* Exchange and negotiate capabilities
* Share implementation details

The client **MUST** initiate this phase by sending an `initialize` request containing:

* Protocol version supported
* Client capabilities
* Client implementation information

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "initialize",
  "params": {
    "protocolVersion": "2024-11-05",
    "capabilities": {
      "roots": {
        "listChanged": true
      },
      "sampling": {},
      "elicitation": {}
    },
    "clientInfo": {
      "name": "ExampleClient",
      "title": "Example Client Display Name",
      "version": "1.0.0"
    }
  }
}
```

The server **MUST** respond with its own capabilities and information:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "protocolVersion": "2024-11-05",
    "capabilities": {
      "logging": {},
      "prompts": {
        "listChanged": true
      },
      "resources": {
        "subscribe": true,
        "listChanged": true
      },
      "tools": {
        "listChanged": true
      }
    },
    "serverInfo": {
      "name": "ExampleServer",
      "title": "Example Server Display Name",
      "version": "1.0.0"
    },
    "instructions": "Optional instructions for the client"
  }
}
```

After successful initialization, the client **MUST** send an `initialized` notification
to indicate it is ready to begin normal operations:

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/initialized"
}
```

* The client **SHOULD NOT** send requests other than
  [pings](/specification/2025-06-18/basic/utilities/ping) before the server has responded to the
  `initialize` request.
* The server **SHOULD NOT** send requests other than
  [pings](/specification/2025-06-18/basic/utilities/ping) and
  [logging](/specification/2025-06-18/server/utilities/logging) before receiving the `initialized`
  notification.

#### Version Negotiation

In the `initialize` request, the client **MUST** send a protocol version it supports.
This **SHOULD** be the *latest* version supported by the client.

If the server supports the requested protocol version, it **MUST** respond with the same
version. Otherwise, the server **MUST** respond with another protocol version it
supports. This **SHOULD** be the *latest* version supported by the server.

If the client does not support the version in the server's response, it **SHOULD**
disconnect.

<Note>
  If using HTTP, the client **MUST** include the `MCP-Protocol-Version: <protocol-version>` HTTP header on all subsequent requests to the MCP
  server.
  For details, see [the Protocol Version Header section in Transports](/specification/2025-06-18/basic/transports#protocol-version-header).
</Note>

#### Capability Negotiation

Client and server capabilities establish which optional protocol features will be
available during the session.

Key capabilities include:

| Category | Capability     | Description                                                                               |
| -------- | -------------- | ----------------------------------------------------------------------------------------- |
| Client   | `roots`        | Ability to provide filesystem [roots](/specification/2025-06-18/client/roots)             |
| Client   | `sampling`     | Support for LLM [sampling](/specification/2025-06-18/client/sampling) requests            |
| Client   | `elicitation`  | Support for server [elicitation](/specification/2025-06-18/client/elicitation) requests   |
| Client   | `experimental` | Describes support for non-standard experimental features                                  |
| Server   | `prompts`      | Offers [prompt templates](/specification/2025-06-18/server/prompts)                       |
| Server   | `resources`    | Provides readable [resources](/specification/2025-06-18/server/resources)                 |
| Server   | `tools`        | Exposes callable [tools](/specification/2025-06-18/server/tools)                          |
| Server   | `logging`      | Emits structured [log messages](/specification/2025-06-18/server/utilities/logging)       |
| Server   | `completions`  | Supports argument [autocompletion](/specification/2025-06-18/server/utilities/completion) |
| Server   | `experimental` | Describes support for non-standard experimental features                                  |

Capability objects can describe sub-capabilities like:

* `listChanged`: Support for list change notifications (for prompts, resources, and
  tools)
* `subscribe`: Support for subscribing to individual items' changes (resources only)

### Operation

During the operation phase, the client and server exchange messages according to the
negotiated capabilities.

Both parties **MUST**:

* Respect the negotiated protocol version
* Only use capabilities that were successfully negotiated

### Shutdown

During the shutdown phase, one side (usually the client) cleanly terminates the protocol
connection. No specific shutdown messages are defined—instead, the underlying transport
mechanism should be used to signal connection termination:

#### stdio

For the stdio [transport](/specification/2025-06-18/basic/transports), the client **SHOULD** initiate
shutdown by:

1. First, closing the input stream to the child process (the server)
2. Waiting for the server to exit, or sending `SIGTERM` if the server does not exit
   within a reasonable time
3. Sending `SIGKILL` if the server does not exit within a reasonable time after `SIGTERM`

The server **MAY** initiate shutdown by closing its output stream to the client and
exiting.

#### HTTP

For HTTP [transports](/specification/2025-06-18/basic/transports), shutdown is indicated by closing the
associated HTTP connection(s).

## Timeouts

Implementations **SHOULD** establish timeouts for all sent requests, to prevent hung
connections and resource exhaustion. When the request has not received a success or error
response within the timeout period, the sender **SHOULD** issue a [cancellation
notification](/specification/2025-06-18/basic/utilities/cancellation) for that request and stop waiting for
a response.

SDKs and other middleware **SHOULD** allow these timeouts to be configured on a
per-request basis.

Implementations **MAY** choose to reset the timeout clock when receiving a [progress
notification](/specification/2025-06-18/basic/utilities/progress) corresponding to the request, as this
implies that work is actually happening. However, implementations **SHOULD** always
enforce a maximum timeout, regardless of progress notifications, to limit the impact of a
misbehaving client or server.

## Error Handling

Implementations **SHOULD** be prepared to handle these error cases:

* Protocol version mismatch
* Failure to negotiate required capabilities
* Request [timeouts](#timeouts)

Example initialization error:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32602,
    "message": "Unsupported protocol version",
    "data": {
      "supported": ["2024-11-05"],
      "requested": "1.0.0"
    }
  }
}
```


# Security Best Practices
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/security_best_practices



<div id="enable-section-numbers" />

## Introduction

### Purpose and Scope

This document provides security considerations for the Model Context Protocol (MCP), complementing the MCP Authorization specification. This document identifies security risks, attack vectors, and best practices specific to MCP implementations.

The primary audience for this document includes developers implementing MCP authorization flows, MCP server operators, and security professionals evaluating MCP-based systems. This document should be read alongside the MCP Authorization specification and [OAuth 2.0 security best practices](https://datatracker.ietf.org/doc/html/rfc9700).

## Attacks and Mitigations

This section gives a detailed description of attacks on MCP implementations, along with potential countermeasures.

### Confused Deputy Problem

Attackers can exploit MCP servers proxying other resource servers, creating "[confused deputy](https://en.wikipedia.org/wiki/Confused_deputy_problem)" vulnerabilities.

#### Terminology

**MCP Proxy Server**
: An MCP server that connects MCP clients to third-party APIs, offering MCP features while delegating operations and acting as a single OAuth client to the third-party API server.

**Third-Party Authorization Server**
: Authorization server that protects the third-party API. It may lack dynamic client registration support, requiring MCP proxy to use a static client ID for all requests.

**Third-Party API**
: The protected resource server that provides the actual API functionality. Access to this
API requires tokens issued by the third-party authorization server.

**Static Client ID**
: A fixed OAuth 2.0 client identifier used by the MCP proxy server when communicating with
the third-party authorization server. This Client ID refers to the MCP server acting as a client
to the Third-Party API. It is the same value for all MCP server to Third-Party API interactions regardless of
which MCP client initiated the request.

#### Architecture and Attack Flows

##### Normal OAuth proxy usage (preserves user consent)

```mermaid
sequenceDiagram
    participant UA as User-Agent (Browser)
    participant MC as MCP Client
    participant M as MCP Proxy Server
    participant TAS as Third-Party Authorization Server

    Note over UA,M: Initial Auth flow completed

    Note over UA,TAS: Step 1: Legitimate user consent for Third Party Server

    M->>UA: Redirect to third party authorization server
    UA->>TAS: Authorization request (client_id: mcp-proxy)
    TAS->>UA: Authorization consent screen
    Note over UA: Review consent screen
    UA->>TAS: Approve
    TAS->>UA: Set consent cookie for client ID: mcp-proxy
    TAS->>UA: 3P Authorization code + redirect to mcp-proxy-server.com
    UA->>M: 3P Authorization code
    Note over M,TAS: Exchange 3P code for 3P token
    Note over M: Generate MCP authorization code
    M->>UA: Redirect to MCP Client with MCP authorization code

    Note over M,UA: Exchange code for token, etc.
```

##### Malicious OAuth proxy usage (skips user consent)

```mermaid
sequenceDiagram
    participant UA as User-Agent (Browser)
    participant M as MCP Proxy Server
    participant TAS as Third-Party Authorization Server
    participant A as Attacker


    Note over UA,A: Step 2: Attack (leveraging existing cookie, skipping consent)
    A->>M: Dynamically register malicious client, redirect_uri: attacker.com
    A->>UA: Sends malicious link
    UA->>TAS: Authorization request (client_id: mcp-proxy) + consent cookie
    rect rgba(255, 17, 0, 0.67)
    TAS->>TAS: Cookie present, consent skipped
    end

   TAS->>UA: 3P Authorization code + redirect to mcp-proxy-server.com
   UA->>M: 3P Authorization code
   Note over M,TAS: Exchange 3P code for 3P token
   Note over M: Generate MCP authorization code
   M->>UA: Redirect to attacker.com with MCP Authorization code
   UA->>A: MCP Authorization code delivered to attacker.com
   Note over M,A: Attacker exchanges MCP code for MCP token
   A->>M: Attacker impersonates user to MCP server
```

#### Attack Description

When an MCP proxy server uses a static client ID to authenticate with a third-party
authorization server that does not support dynamic client registration, the following
attack becomes possible:

1. A user authenticates normally through the MCP proxy server to access the third-party API
2. During this flow, the third-party authorization server sets a cookie on the user agent
   indicating consent for the static client ID
3. An attacker later sends the user a malicious link containing a crafted authorization request which contains a malicious redirect URI along with a new dynamically registered client ID
4. When the user clicks the link, their browser still has the consent cookie from the previous legitimate request
5. The third-party authorization server detects the cookie and skips the consent screen
6. The MCP authorization code is redirected to the attacker's server (specified in the crafted redirect\_uri during dynamic client registration)
7. The attacker exchanges the stolen authorization code for access tokens for the MCP server without the user's explicit approval
8. Attacker now has access to the third-party API as the compromised user

#### Mitigation

MCP proxy servers using static client IDs **MUST** obtain user consent for each dynamically
registered client before forwarding to third-party authorization servers (which may require additional consent).

### Token Passthrough

"Token passthrough" is an anti-pattern where an MCP server accepts tokens from an MCP client without validating that the tokens were properly issued *to the MCP server* and "passing them through" to the downstream API.

#### Risks

Token passthrough is explicitly forbidden in the [authorization specification](/specification/2025-06-18/basic/authorization) as it introduces a number of security risks, that include:

* **Security Control Circumvention**
  * The MCP Server or downstream APIs might implement important security controls like rate limiting, request validation, or traffic monitoring, that depend on the token audience or other credential constraints. If clients can obtain and use tokens directly with the downstream APIs without the MCP server validating them properly or ensuring that the tokens are issued for the right service, they bypass these controls.
* **Accountability and Audit Trail Issues**
  * The MCP Server will be unable to identify or distinguish between MCP Clients when clients are calling with an upstream-issued access token which may be opaque to the MCP Server.
  * The downstream Resource Server’s logs may show requests that appear to come from a different source with a different identity, rather than the MCP server that is actually forwarding the tokens.
  * Both factors make incident investigation, controls, and auditing more difficult.
  * If the MCP Server passes tokens without validating their claims (e.g., roles, privileges, or audience) or other metadata, a malicious actor in possession of a stolen token can use the server as a proxy for data exfiltration.
* **Trust Boundary Issues**
  * The downstream Resource Server grants trust to specific entities. This trust might include assumptions about origin or client behavior patterns. Breaking this trust boundary could lead to unexpected issues.
  * If the token is accepted by multiple services without proper validation, an attacker compromising one service can use the token to access other connected services.
* **Future Compatibility Risk**
  * Even if an MCP Server starts as a "pure proxy" today, it might need to add security controls later. Starting with proper token audience separation makes it easier to evolve the security model.

#### Mitigation

MCP servers **MUST NOT** accept any tokens that were not explicitly issued for the MCP server.

### Session Hijacking

Session hijacking is an attack vector where a client is provided a session ID by the server, and an unauthorized party is able to obtain and use that same session ID to impersonate the original client and perform unauthorized actions on their behalf.

#### Session Hijack Prompt Injection

```mermaid
sequenceDiagram
    participant Client
    participant ServerA
    participant Queue
    participant ServerB
    participant Attacker

    Client->>ServerA: Initialize (connect to streamable HTTP server)
    ServerA-->>Client: Respond with session ID

    Attacker->>ServerB: Access/guess session ID
    Note right of Attacker: Attacker knows/guesses session ID

    Attacker->>ServerB: Trigger event (malicious payload, using session ID)
    ServerB->>Queue: Enqueue event (keyed by session ID)

    ServerA->>Queue: Poll for events (using session ID)
    Queue-->>ServerA: Event data (malicious payload)

    ServerA-->>Client: Async response (malicious payload)
    Client->>Client: Acts based on malicious payload
```

#### Session Hijack Impersonation

```mermaid
sequenceDiagram
    participant Client
    participant Server
    participant Attacker

    Client->>Server: Initialize (login/authenticate)
    Server-->>Client: Respond with session ID (persistent session created)

    Attacker->>Server: Access/guess session ID
    Note right of Attacker: Attacker knows/guesses session ID

    Attacker->>Server: Make API call (using session ID, no re-auth)
    Server-->>Attacker: Respond as if Attacker is Client (session hijack)
```

#### Attack Description

When you have multiple stateful HTTP servers that handle MCP requests, the following attack vectors are possible:

**Session Hijack Prompt Injection**

1. The client connects to **Server A** and receives a session ID.

2. The attacker obtains an existing session ID and sends a malicious event to **Server B** with said session ID.
   * When a server supports [redelivery/resumable streams](/specification/2025-06-18/basic/transports#resumability-and-redelivery), deliberately terminating the request before receiving the response could lead to it being resumed by the original client via the GET request for server sent events.
   * If a particular server initiates server sent events as a consequence of a tool call such as a `notifications/tools/list_changed`, where it is possible to affect the tools that are offered by the server, a client could end up with tools that they were not aware were enabled.

3. **Server B** enqueues the event (associated with session ID) into a shared queue.

4. **Server A** polls the queue for events using the session ID and retrieves the malicious payload.

5. **Server A** sends the malicious payload to the client as an asynchronous or resumed response.

6. The client receives and acts on the malicious payload, leading to potential compromise.

**Session Hijack Impersonation**

1. The MCP client authenticates with the MCP server, creating a persistent session ID.
2. The attacker obtains the session ID.
3. The attacker makes calls to the MCP server using the session ID.
4. MCP server does not check for additional authorization and treats the attacker as a legitimate user, allowing unauthorized access or actions.

#### Mitigation

To prevent session hijacking and event injection attacks, the following mitigations should be implemented:

MCP servers that implement authorization **MUST** verify all inbound requests.
MCP Servers **MUST NOT** use sessions for authentication.

MCP servers **MUST** use secure, non-deterministic session IDs.
Generated session IDs (e.g., UUIDs) **SHOULD** use secure random number generators. Avoid predictable or sequential session identifiers that could be guessed by an attacker. Rotating or expiring session IDs can also reduce the risk.

MCP servers **SHOULD** bind session IDs to user-specific information.
When storing or transmitting session-related data (e.g., in a queue), combine the session ID with information unique to the authorized user, such as their internal user ID. Use a key format like `<user_id>:<session_id>`. This ensures that even if an attacker guesses a session ID, they cannot impersonate another user as the user ID is derived from the user token and not provided by the client.

MCP servers can optionally leverage additional unique identifiers.


# Transports
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/transports



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

MCP uses JSON-RPC to encode messages. JSON-RPC messages **MUST** be UTF-8 encoded.

The protocol currently defines two standard transport mechanisms for client-server
communication:

1. [stdio](#stdio), communication over standard in and standard out
2. [Streamable HTTP](#streamable-http)

Clients **SHOULD** support stdio whenever possible.

It is also possible for clients and servers to implement
[custom transports](#custom-transports) in a pluggable fashion.

## stdio

In the **stdio** transport:

* The client launches the MCP server as a subprocess.
* The server reads JSON-RPC messages from its standard input (`stdin`) and sends messages
  to its standard output (`stdout`).
* Messages are individual JSON-RPC requests, notifications, or responses.
* Messages are delimited by newlines, and **MUST NOT** contain embedded newlines.
* The server **MAY** write UTF-8 strings to its standard error (`stderr`) for logging
  purposes. Clients **MAY** capture, forward, or ignore this logging.
* The server **MUST NOT** write anything to its `stdout` that is not a valid MCP message.
* The client **MUST NOT** write anything to the server's `stdin` that is not a valid MCP
  message.

```mermaid
sequenceDiagram
    participant Client
    participant Server Process

    Client->>+Server Process: Launch subprocess
    loop Message Exchange
        Client->>Server Process: Write to stdin
        Server Process->>Client: Write to stdout
        Server Process--)Client: Optional logs on stderr
    end
    Client->>Server Process: Close stdin, terminate subprocess
    deactivate Server Process
```

## Streamable HTTP

<Info>
  This replaces the [HTTP+SSE
  transport](/specification/2024-11-05/basic/transports#http-with-sse) from
  protocol version 2024-11-05. See the [backwards compatibility](#backwards-compatibility)
  guide below.
</Info>

In the **Streamable HTTP** transport, the server operates as an independent process that
can handle multiple client connections. This transport uses HTTP POST and GET requests.
Server can optionally make use of
[Server-Sent Events](https://en.wikipedia.org/wiki/Server-sent_events) (SSE) to stream
multiple server messages. This permits basic MCP servers, as well as more feature-rich
servers supporting streaming and server-to-client notifications and requests.

The server **MUST** provide a single HTTP endpoint path (hereafter referred to as the
**MCP endpoint**) that supports both POST and GET methods. For example, this could be a
URL like `https://example.com/mcp`.

#### Security Warning

When implementing Streamable HTTP transport:

1. Servers **MUST** validate the `Origin` header on all incoming connections to prevent DNS rebinding attacks
2. When running locally, servers **SHOULD** bind only to localhost (127.0.0.1) rather than all network interfaces (0.0.0.0)
3. Servers **SHOULD** implement proper authentication for all connections

Without these protections, attackers could use DNS rebinding to interact with local MCP servers from remote websites.

### Sending Messages to the Server

Every JSON-RPC message sent from the client **MUST** be a new HTTP POST request to the
MCP endpoint.

1. The client **MUST** use HTTP POST to send JSON-RPC messages to the MCP endpoint.
2. The client **MUST** include an `Accept` header, listing both `application/json` and
   `text/event-stream` as supported content types.
3. The body of the POST request **MUST** be a single JSON-RPC *request*, *notification*, or *response*.
4. If the input is a JSON-RPC *response* or *notification*:
   * If the server accepts the input, the server **MUST** return HTTP status code 202
     Accepted with no body.
   * If the server cannot accept the input, it **MUST** return an HTTP error status code
     (e.g., 400 Bad Request). The HTTP response body **MAY** comprise a JSON-RPC *error
     response* that has no `id`.
5. If the input is a JSON-RPC *request*, the server **MUST** either
   return `Content-Type: text/event-stream`, to initiate an SSE stream, or
   `Content-Type: application/json`, to return one JSON object. The client **MUST**
   support both these cases.
6. If the server initiates an SSE stream:
   * The SSE stream **SHOULD** eventually include JSON-RPC *response* for the
     JSON-RPC *request* sent in the POST body.
   * The server **MAY** send JSON-RPC *requests* and *notifications* before sending the
     JSON-RPC *response*. These messages **SHOULD** relate to the originating client
     *request*.
   * The server **SHOULD NOT** close the SSE stream before sending the JSON-RPC *response*
     for the received JSON-RPC *request*, unless the [session](#session-management)
     expires.
   * After the JSON-RPC *response* has been sent, the server **SHOULD** close the SSE
     stream.
   * Disconnection **MAY** occur at any time (e.g., due to network conditions).
     Therefore:
     * Disconnection **SHOULD NOT** be interpreted as the client cancelling its request.
     * To cancel, the client **SHOULD** explicitly send an MCP `CancelledNotification`.
     * To avoid message loss due to disconnection, the server **MAY** make the stream
       [resumable](#resumability-and-redelivery).

### Listening for Messages from the Server

1. The client **MAY** issue an HTTP GET to the MCP endpoint. This can be used to open an
   SSE stream, allowing the server to communicate to the client, without the client first
   sending data via HTTP POST.
2. The client **MUST** include an `Accept` header, listing `text/event-stream` as a
   supported content type.
3. The server **MUST** either return `Content-Type: text/event-stream` in response to
   this HTTP GET, or else return HTTP 405 Method Not Allowed, indicating that the server
   does not offer an SSE stream at this endpoint.
4. If the server initiates an SSE stream:
   * The server **MAY** send JSON-RPC *requests* and *notifications* on the stream.
   * These messages **SHOULD** be unrelated to any concurrently-running JSON-RPC
     *request* from the client.
   * The server **MUST NOT** send a JSON-RPC *response* on the stream **unless**
     [resuming](#resumability-and-redelivery) a stream associated with a previous client
     request.
   * The server **MAY** close the SSE stream at any time.
   * The client **MAY** close the SSE stream at any time.

### Multiple Connections

1. The client **MAY** remain connected to multiple SSE streams simultaneously.
2. The server **MUST** send each of its JSON-RPC messages on only one of the connected
   streams; that is, it **MUST NOT** broadcast the same message across multiple streams.
   * The risk of message loss **MAY** be mitigated by making the stream
     [resumable](#resumability-and-redelivery).

### Resumability and Redelivery

To support resuming broken connections, and redelivering messages that might otherwise be
lost:

1. Servers **MAY** attach an `id` field to their SSE events, as described in the
   [SSE standard](https://html.spec.whatwg.org/multipage/server-sent-events.html#event-stream-interpretation).
   * If present, the ID **MUST** be globally unique across all streams within that
     [session](#session-management)—or all streams with that specific client, if session
     management is not in use.
2. If the client wishes to resume after a broken connection, it **SHOULD** issue an HTTP
   GET to the MCP endpoint, and include the
   [`Last-Event-ID`](https://html.spec.whatwg.org/multipage/server-sent-events.html#the-last-event-id-header)
   header to indicate the last event ID it received.
   * The server **MAY** use this header to replay messages that would have been sent
     after the last event ID, *on the stream that was disconnected*, and to resume the
     stream from that point.
   * The server **MUST NOT** replay messages that would have been delivered on a
     different stream.

In other words, these event IDs should be assigned by servers on a *per-stream* basis, to
act as a cursor within that particular stream.

### Session Management

An MCP "session" consists of logically related interactions between a client and a
server, beginning with the [initialization phase](/specification/2025-06-18/basic/lifecycle). To support
servers which want to establish stateful sessions:

1. A server using the Streamable HTTP transport **MAY** assign a session ID at
   initialization time, by including it in an `Mcp-Session-Id` header on the HTTP
   response containing the `InitializeResult`.
   * The session ID **SHOULD** be globally unique and cryptographically secure (e.g., a
     securely generated UUID, a JWT, or a cryptographic hash).
   * The session ID **MUST** only contain visible ASCII characters (ranging from 0x21 to
     0x7E).
2. If an `Mcp-Session-Id` is returned by the server during initialization, clients using
   the Streamable HTTP transport **MUST** include it in the `Mcp-Session-Id` header on
   all of their subsequent HTTP requests.
   * Servers that require a session ID **SHOULD** respond to requests without an
     `Mcp-Session-Id` header (other than initialization) with HTTP 400 Bad Request.
3. The server **MAY** terminate the session at any time, after which it **MUST** respond
   to requests containing that session ID with HTTP 404 Not Found.
4. When a client receives HTTP 404 in response to a request containing an
   `Mcp-Session-Id`, it **MUST** start a new session by sending a new `InitializeRequest`
   without a session ID attached.
5. Clients that no longer need a particular session (e.g., because the user is leaving
   the client application) **SHOULD** send an HTTP DELETE to the MCP endpoint with the
   `Mcp-Session-Id` header, to explicitly terminate the session.
   * The server **MAY** respond to this request with HTTP 405 Method Not Allowed,
     indicating that the server does not allow clients to terminate sessions.

### Sequence Diagram

```mermaid
sequenceDiagram
    participant Client
    participant Server

    note over Client, Server: initialization

    Client->>+Server: POST InitializeRequest
    Server->>-Client: InitializeResponse<br>Mcp-Session-Id: 1868a90c...

    Client->>+Server: POST InitializedNotification<br>Mcp-Session-Id: 1868a90c...
    Server->>-Client: 202 Accepted

    note over Client, Server: client requests
    Client->>+Server: POST ... request ...<br>Mcp-Session-Id: 1868a90c...

    alt single HTTP response
      Server->>Client: ... response ...
    else server opens SSE stream
      loop while connection remains open
          Server-)Client: ... SSE messages from server ...
      end
      Server-)Client: SSE event: ... response ...
    end
    deactivate Server

    note over Client, Server: client notifications/responses
    Client->>+Server: POST ... notification/response ...<br>Mcp-Session-Id: 1868a90c...
    Server->>-Client: 202 Accepted

    note over Client, Server: server requests
    Client->>+Server: GET<br>Mcp-Session-Id: 1868a90c...
    loop while connection remains open
        Server-)Client: ... SSE messages from server ...
    end
    deactivate Server

```

### Protocol Version Header

If using HTTP, the client **MUST** include the `MCP-Protocol-Version: <protocol-version>` HTTP header on all subsequent requests to the MCP
server, allowing the MCP server to respond based on the MCP protocol version.

For example: `MCP-Protocol-Version: 2025-06-18`

The protocol version sent by the client **SHOULD** be the one [negotiated during
initialization](/specification/2025-06-18/basic/lifecycle#version-negotiation).

For backwards compatibility, if the server does *not* receive an `MCP-Protocol-Version`
header, and has no other way to identify the version - for example, by relying on the
protocol version negotiated during initialization - the server **SHOULD** assume protocol
version `2025-03-26`.

If the server receives a request with an invalid or unsupported
`MCP-Protocol-Version`, it **MUST** respond with `400 Bad Request`.

### Backwards Compatibility

Clients and servers can maintain backwards compatibility with the deprecated [HTTP+SSE
transport](/specification/2024-11-05/basic/transports#http-with-sse) (from
protocol version 2024-11-05) as follows:

**Servers** wanting to support older clients should:

* Continue to host both the SSE and POST endpoints of the old transport, alongside the
  new "MCP endpoint" defined for the Streamable HTTP transport.
  * It is also possible to combine the old POST endpoint and the new MCP endpoint, but
    this may introduce unneeded complexity.

**Clients** wanting to support older servers should:

1. Accept an MCP server URL from the user, which may point to either a server using the
   old transport or the new transport.
2. Attempt to POST an `InitializeRequest` to the server URL, with an `Accept` header as
   defined above:
   * If it succeeds, the client can assume this is a server supporting the new Streamable
     HTTP transport.
   * If it fails with an HTTP 4xx status code (e.g., 405 Method Not Allowed or 404 Not
     Found):
     * Issue a GET request to the server URL, expecting that this will open an SSE stream
       and return an `endpoint` event as the first event.
     * When the `endpoint` event arrives, the client can assume this is a server running
       the old HTTP+SSE transport, and should use that transport for all subsequent
       communication.

## Custom Transports

Clients and servers **MAY** implement additional custom transport mechanisms to suit
their specific needs. The protocol is transport-agnostic and can be implemented over any
communication channel that supports bidirectional message exchange.

Implementers who choose to support custom transports **MUST** ensure they preserve the
JSON-RPC message format and lifecycle requirements defined by MCP. Custom transports
**SHOULD** document their specific connection establishment and message exchange patterns
to aid interoperability.


# Cancellation
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/utilities/cancellation



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) supports optional cancellation of in-progress requests
through notification messages. Either side can send a cancellation notification to
indicate that a previously-issued request should be terminated.

## Cancellation Flow

When a party wants to cancel an in-progress request, it sends a `notifications/cancelled`
notification containing:

* The ID of the request to cancel
* An optional reason string that can be logged or displayed

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/cancelled",
  "params": {
    "requestId": "123",
    "reason": "User requested cancellation"
  }
}
```

## Behavior Requirements

1. Cancellation notifications **MUST** only reference requests that:
   * Were previously issued in the same direction
   * Are believed to still be in-progress
2. The `initialize` request **MUST NOT** be cancelled by clients
3. Receivers of cancellation notifications **SHOULD**:
   * Stop processing the cancelled request
   * Free associated resources
   * Not send a response for the cancelled request
4. Receivers **MAY** ignore cancellation notifications if:
   * The referenced request is unknown
   * Processing has already completed
   * The request cannot be cancelled
5. The sender of the cancellation notification **SHOULD** ignore any response to the
   request that arrives afterward

## Timing Considerations

Due to network latency, cancellation notifications may arrive after request processing
has completed, and potentially after a response has already been sent.

Both parties **MUST** handle these race conditions gracefully:

```mermaid
sequenceDiagram
   participant Client
   participant Server

   Client->>Server: Request (ID: 123)
   Note over Server: Processing starts
   Client--)Server: notifications/cancelled (ID: 123)
   alt
      Note over Server: Processing may have<br/>completed before<br/>cancellation arrives
   else If not completed
      Note over Server: Stop processing
   end
```

## Implementation Notes

* Both parties **SHOULD** log cancellation reasons for debugging
* Application UIs **SHOULD** indicate when cancellation is requested

## Error Handling

Invalid cancellation notifications **SHOULD** be ignored:

* Unknown request IDs
* Already completed requests
* Malformed notifications

This maintains the "fire and forget" nature of notifications while allowing for race
conditions in asynchronous communication.


# Ping
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/utilities/ping



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol includes an optional ping mechanism that allows either party
to verify that their counterpart is still responsive and the connection is alive.

## Overview

The ping functionality is implemented through a simple request/response pattern. Either
the client or server can initiate a ping by sending a `ping` request.

## Message Format

A ping request is a standard JSON-RPC request with no parameters:

```json
{
  "jsonrpc": "2.0",
  "id": "123",
  "method": "ping"
}
```

## Behavior Requirements

1. The receiver **MUST** respond promptly with an empty response:

```json
{
  "jsonrpc": "2.0",
  "id": "123",
  "result": {}
}
```

2. If no response is received within a reasonable timeout period, the sender **MAY**:
   * Consider the connection stale
   * Terminate the connection
   * Attempt reconnection procedures

## Usage Patterns

```mermaid
sequenceDiagram
    participant Sender
    participant Receiver

    Sender->>Receiver: ping request
    Receiver->>Sender: empty response
```

## Implementation Considerations

* Implementations **SHOULD** periodically issue pings to detect connection health
* The frequency of pings **SHOULD** be configurable
* Timeouts **SHOULD** be appropriate for the network environment
* Excessive pinging **SHOULD** be avoided to reduce network overhead

## Error Handling

* Timeouts **SHOULD** be treated as connection failures
* Multiple failed pings **MAY** trigger connection reset
* Implementations **SHOULD** log ping failures for diagnostics


# Progress
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/utilities/progress



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) supports optional progress tracking for long-running
operations through notification messages. Either side can send progress notifications to
provide updates about operation status.

## Progress Flow

When a party wants to *receive* progress updates for a request, it includes a
`progressToken` in the request metadata.

* Progress tokens **MUST** be a string or integer value
* Progress tokens can be chosen by the sender using any means, but **MUST** be unique
  across all active requests.

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "some_method",
  "params": {
    "_meta": {
      "progressToken": "abc123"
    }
  }
}
```

The receiver **MAY** then send progress notifications containing:

* The original progress token
* The current progress value so far
* An optional "total" value
* An optional "message" value

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/progress",
  "params": {
    "progressToken": "abc123",
    "progress": 50,
    "total": 100,
    "message": "Reticulating splines..."
  }
}
```

* The `progress` value **MUST** increase with each notification, even if the total is
  unknown.
* The `progress` and the `total` values **MAY** be floating point.
* The `message` field **SHOULD** provide relevant human readable progress information.

## Behavior Requirements

1. Progress notifications **MUST** only reference tokens that:
   * Were provided in an active request
   * Are associated with an in-progress operation

2. Receivers of progress requests **MAY**:
   * Choose not to send any progress notifications
   * Send notifications at whatever frequency they deem appropriate
   * Omit the total value if unknown

```mermaid
sequenceDiagram
    participant Sender
    participant Receiver

    Note over Sender,Receiver: Request with progress token
    Sender->>Receiver: Method request with progressToken

    Note over Sender,Receiver: Progress updates
    Receiver-->>Sender: Progress notification (0.2/1.0)
    Receiver-->>Sender: Progress notification (0.6/1.0)
    Receiver-->>Sender: Progress notification (1.0/1.0)

    Note over Sender,Receiver: Operation complete
    Receiver->>Sender: Method response
```

## Implementation Notes

* Senders and receivers **SHOULD** track active progress tokens
* Both parties **SHOULD** implement rate limiting to prevent flooding
* Progress notifications **MUST** stop after completion


# Key Changes
Source: https://modelcontextprotocol.io/specification/2025-06-18/changelog



<div id="enable-section-numbers" />

This document lists changes made to the Model Context Protocol (MCP) specification since
the previous revision, [2025-03-26](/specification/2025-03-26).

## Major changes

1. Remove support for JSON-RPC **[batching](https://www.jsonrpc.org/specification#batch)**
   (PR [#416](https://github.com/modelcontextprotocol/specification/pull/416))
2. Add support for [structured tool output](/specification/2025-06-18/server/tools#structured-content)
   (PR [#371](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/371))
3. Classify MCP servers as [OAuth Resource Servers](/specification/2025-06-18/basic/authorization#authorization-server-discovery),
   adding protected resource metadata to discover the corresponding Authorization server.
   (PR [#338](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/338))
4. Require MCP clients to implement Resource Indicators as described in [RFC 8707](https://www.rfc-editor.org/rfc/rfc8707.html) to prevent
   malicious servers from obtaining access tokens.
   (PR [#734](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/734))
5. Clarify [security considerations](/specification/2025-06-18/basic/authorization#security-considerations) and best practices
   in the authorization spec and in a new [security best practices page](/specification/2025-06-18/basic/security_best_practices).
6. Add support for **[elicitation](/specification/2025-06-18/client/elicitation)**, enabling servers to request additional
   information from users during interactions.
   (PR [#382](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/382))
7. Add support for **[resource links](/specification/2025-06-18/server/tools#resource-links)** in
   tool call results. (PR [#603](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/603))
8. Require [negotiated protocol version to be specified](/specification/2025-06-18/basic/transports#protocol-version-header)
   via `MCP-Protocol-Version` header in subsequent requests when using HTTP (PR [#548](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/548)).
9. Change **SHOULD** to **MUST** in [Lifecycle Operation](/specification/2025-06-18/basic/lifecycle#operation)

## Other schema changes

1. Add `_meta` field to additional interface types (PR [#710](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/710)),
   and specify [proper usage](/specification/2025-06-18/basic#meta).
2. Add `context` field to `CompletionRequest`, providing for completion requests to include
   previously-resolved variables (PR [#598](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/598)).
3. Add `title` field for human-friendly display names, so that `name` can be used as a programmatic
   identifier (PR [#663](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/663))

## Full changelog

For a complete list of all changes that have been made since the last protocol revision,
[see GitHub](https://github.com/modelcontextprotocol/specification/compare/2025-03-26...2025-06-18).


# Elicitation
Source: https://modelcontextprotocol.io/specification/2025-06-18/client/elicitation



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

<Note>
  Elicitation is newly introduced in this version of the MCP specification and its design may evolve in future protocol versions.
</Note>

The Model Context Protocol (MCP) provides a standardized way for servers to request additional
information from users through the client during interactions. This flow allows clients to
maintain control over user interactions and data sharing while enabling servers to gather
necessary information dynamically.
Servers request structured data from users with JSON schemas to validate responses.

## User Interaction Model

Elicitation in MCP allows servers to implement interactive workflows by enabling user input
requests to occur *nested* inside other MCP server features.

Implementations are free to expose elicitation through any interface pattern that suits
their needs—the protocol itself does not mandate any specific user interaction
model.

<Warning>
  For trust & safety and security:

  * Servers **MUST NOT** use elicitation to request sensitive information.

  Applications **SHOULD**:

  * Provide UI that makes it clear which server is requesting information
  * Allow users to review and modify their responses before sending
  * Respect user privacy and provide clear decline and cancel options
</Warning>

## Capabilities

Clients that support elicitation **MUST** declare the `elicitation` capability during
[initialization](/specification/2025-06-18/basic/lifecycle#initialization):

```json
{
  "capabilities": {
    "elicitation": {}
  }
}
```

## Protocol Messages

### Creating Elicitation Requests

To request information from a user, servers send an `elicitation/create` request:

#### Simple Text Request

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "elicitation/create",
  "params": {
    "message": "Please provide your GitHub username",
    "requestedSchema": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string"
        }
      },
      "required": ["name"]
    }
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "action": "accept",
    "content": {
      "name": "octocat"
    }
  }
}
```

#### Structured Data Request

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "elicitation/create",
  "params": {
    "message": "Please provide your contact information",
    "requestedSchema": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string",
          "description": "Your full name"
        },
        "email": {
          "type": "string",
          "format": "email",
          "description": "Your email address"
        },
        "age": {
          "type": "number",
          "minimum": 18,
          "description": "Your age"
        }
      },
      "required": ["name", "email"]
    }
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "result": {
    "action": "accept",
    "content": {
      "name": "Monalisa Octocat",
      "email": "octocat@github.com",
      "age": 30
    }
  }
}
```

**Reject Response Example:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "result": {
    "action": "decline"
  }
}
```

**Cancel Response Example:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "result": {
    "action": "cancel"
  }
}
```

## Message Flow

```mermaid
sequenceDiagram
    participant User
    participant Client
    participant Server

    Note over Server,Client: Server initiates elicitation
    Server->>Client: elicitation/create

    Note over Client,User: Human interaction
    Client->>User: Present elicitation UI
    User-->>Client: Provide requested information

    Note over Server,Client: Complete request
    Client-->>Server: Return user response

    Note over Server: Continue processing with new information
```

## Request Schema

The `requestedSchema` field allows servers to define the structure of the expected response using a restricted subset of JSON Schema. To simplify implementation for clients, elicitation schemas are limited to flat objects with primitive properties only:

```json
"requestedSchema": {
  "type": "object",
  "properties": {
    "propertyName": {
      "type": "string",
      "title": "Display Name",
      "description": "Description of the property"
    },
    "anotherProperty": {
      "type": "number",
      "minimum": 0,
      "maximum": 100
    }
  },
  "required": ["propertyName"]
}
```

### Supported Schema Types

The schema is restricted to these primitive types:

1. **String Schema**

   ```json
   {
     "type": "string",
     "title": "Display Name",
     "description": "Description text",
     "minLength": 3,
     "maxLength": 50,
     "format": "email" // Supported: "email", "uri", "date", "date-time"
   }
   ```

   Supported formats: `email`, `uri`, `date`, `date-time`

2. **Number Schema**

   ```json
   {
     "type": "number", // or "integer"
     "title": "Display Name",
     "description": "Description text",
     "minimum": 0,
     "maximum": 100
   }
   ```

3. **Boolean Schema**

   ```json
   {
     "type": "boolean",
     "title": "Display Name",
     "description": "Description text",
     "default": false
   }
   ```

4. **Enum Schema**
   ```json
   {
     "type": "string",
     "title": "Display Name",
     "description": "Description text",
     "enum": ["option1", "option2", "option3"],
     "enumNames": ["Option 1", "Option 2", "Option 3"]
   }
   ```

Clients can use this schema to:

1. Generate appropriate input forms
2. Validate user input before sending
3. Provide better guidance to users

Note that complex nested structures, arrays of objects, and other advanced JSON Schema features are intentionally not supported to simplify client implementation.

## Response Actions

Elicitation responses use a three-action model to clearly distinguish between different user actions:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "action": "accept", // or "decline" or "cancel"
    "content": {
      "propertyName": "value",
      "anotherProperty": 42
    }
  }
}
```

The three response actions are:

1. **Accept** (`action: "accept"`): User explicitly approved and submitted with data
   * The `content` field contains the submitted data matching the requested schema
   * Example: User clicked "Submit", "OK", "Confirm", etc.

2. **Decline** (`action: "decline"`): User explicitly declined the request
   * The `content` field is typically omitted
   * Example: User clicked "Reject", "Decline", "No", etc.

3. **Cancel** (`action: "cancel"`): User dismissed without making an explicit choice
   * The `content` field is typically omitted
   * Example: User closed the dialog, clicked outside, pressed Escape, etc.

Servers should handle each state appropriately:

* **Accept**: Process the submitted data
* **Decline**: Handle explicit decline (e.g., offer alternatives)
* **Cancel**: Handle dismissal (e.g., prompt again later)

## Security Considerations

1. Servers **MUST NOT** request sensitive information through elicitation
2. Clients **SHOULD** implement user approval controls
3. Both parties **SHOULD** validate elicitation content against the provided schema
4. Clients **SHOULD** provide clear indication of which server is requesting information
5. Clients **SHOULD** allow users to decline elicitation requests at any time
6. Clients **SHOULD** implement rate limiting
7. Clients **SHOULD** present elicitation requests in a way that makes it clear what information is being requested and why


# Roots
Source: https://modelcontextprotocol.io/specification/2025-06-18/client/roots



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) provides a standardized way for clients to expose
filesystem "roots" to servers. Roots define the boundaries of where servers can operate
within the filesystem, allowing them to understand which directories and files they have
access to. Servers can request the list of roots from supporting clients and receive
notifications when that list changes.

## User Interaction Model

Roots in MCP are typically exposed through workspace or project configuration interfaces.

For example, implementations could offer a workspace/project picker that allows users to
select directories and files the server should have access to. This can be combined with
automatic workspace detection from version control systems or project files.

However, implementations are free to expose roots through any interface pattern that
suits their needs—the protocol itself does not mandate any specific user
interaction model.

## Capabilities

Clients that support roots **MUST** declare the `roots` capability during
[initialization](/specification/2025-06-18/basic/lifecycle#initialization):

```json
{
  "capabilities": {
    "roots": {
      "listChanged": true
    }
  }
}
```

`listChanged` indicates whether the client will emit notifications when the list of roots
changes.

## Protocol Messages

### Listing Roots

To retrieve roots, servers send a `roots/list` request:

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "roots/list"
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "roots": [
      {
        "uri": "file:///home/user/projects/myproject",
        "name": "My Project"
      }
    ]
  }
}
```

### Root List Changes

When roots change, clients that support `listChanged` **MUST** send a notification:

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/roots/list_changed"
}
```

## Message Flow

```mermaid
sequenceDiagram
    participant Server
    participant Client

    Note over Server,Client: Discovery
    Server->>Client: roots/list
    Client-->>Server: Available roots

    Note over Server,Client: Changes
    Client--)Server: notifications/roots/list_changed
    Server->>Client: roots/list
    Client-->>Server: Updated roots
```

## Data Types

### Root

A root definition includes:

* `uri`: Unique identifier for the root. This **MUST** be a `file://` URI in the current
  specification.
* `name`: Optional human-readable name for display purposes.

Example roots for different use cases:

#### Project Directory

```json
{
  "uri": "file:///home/user/projects/myproject",
  "name": "My Project"
}
```

#### Multiple Repositories

```json
[
  {
    "uri": "file:///home/user/repos/frontend",
    "name": "Frontend Repository"
  },
  {
    "uri": "file:///home/user/repos/backend",
    "name": "Backend Repository"
  }
]
```

## Error Handling

Clients **SHOULD** return standard JSON-RPC errors for common failure cases:

* Client does not support roots: `-32601` (Method not found)
* Internal errors: `-32603`

Example error:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32601,
    "message": "Roots not supported",
    "data": {
      "reason": "Client does not have roots capability"
    }
  }
}
```

## Security Considerations

1. Clients **MUST**:
   * Only expose roots with appropriate permissions
   * Validate all root URIs to prevent path traversal
   * Implement proper access controls
   * Monitor root accessibility

2. Servers **SHOULD**:
   * Handle cases where roots become unavailable
   * Respect root boundaries during operations
   * Validate all paths against provided roots

## Implementation Guidelines

1. Clients **SHOULD**:
   * Prompt users for consent before exposing roots to servers
   * Provide clear user interfaces for root management
   * Validate root accessibility before exposing
   * Monitor for root changes

2. Servers **SHOULD**:
   * Check for roots capability before usage
   * Handle root list changes gracefully
   * Respect root boundaries in operations
   * Cache root information appropriately


# Sampling
Source: https://modelcontextprotocol.io/specification/2025-06-18/client/sampling



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) provides a standardized way for servers to request LLM
sampling ("completions" or "generations") from language models via clients. This flow
allows clients to maintain control over model access, selection, and permissions while
enabling servers to leverage AI capabilities—with no server API keys necessary.
Servers can request text, audio, or image-based interactions and optionally include
context from MCP servers in their prompts.

## User Interaction Model

Sampling in MCP allows servers to implement agentic behaviors, by enabling LLM calls to
occur *nested* inside other MCP server features.

Implementations are free to expose sampling through any interface pattern that suits
their needs—the protocol itself does not mandate any specific user interaction
model.

<Warning>
  For trust & safety and security, there **SHOULD** always
  be a human in the loop with the ability to deny sampling requests.

  Applications **SHOULD**:

  * Provide UI that makes it easy and intuitive to review sampling requests
  * Allow users to view and edit prompts before sending
  * Present generated responses for review before delivery
</Warning>

## Capabilities

Clients that support sampling **MUST** declare the `sampling` capability during
[initialization](/specification/2025-06-18/basic/lifecycle#initialization):

```json
{
  "capabilities": {
    "sampling": {}
  }
}
```

## Protocol Messages

### Creating Messages

To request a language model generation, servers send a `sampling/createMessage` request:

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "sampling/createMessage",
  "params": {
    "messages": [
      {
        "role": "user",
        "content": {
          "type": "text",
          "text": "What is the capital of France?"
        }
      }
    ],
    "modelPreferences": {
      "hints": [
        {
          "name": "claude-3-sonnet"
        }
      ],
      "intelligencePriority": 0.8,
      "speedPriority": 0.5
    },
    "systemPrompt": "You are a helpful assistant.",
    "maxTokens": 100
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "role": "assistant",
    "content": {
      "type": "text",
      "text": "The capital of France is Paris."
    },
    "model": "claude-3-sonnet-20240307",
    "stopReason": "endTurn"
  }
}
```

## Message Flow

```mermaid
sequenceDiagram
    participant Server
    participant Client
    participant User
    participant LLM

    Note over Server,Client: Server initiates sampling
    Server->>Client: sampling/createMessage

    Note over Client,User: Human-in-the-loop review
    Client->>User: Present request for approval
    User-->>Client: Review and approve/modify

    Note over Client,LLM: Model interaction
    Client->>LLM: Forward approved request
    LLM-->>Client: Return generation

    Note over Client,User: Response review
    Client->>User: Present response for approval
    User-->>Client: Review and approve/modify

    Note over Server,Client: Complete request
    Client-->>Server: Return approved response
```

## Data Types

### Messages

Sampling messages can contain:

#### Text Content

```json
{
  "type": "text",
  "text": "The message content"
}
```

#### Image Content

```json
{
  "type": "image",
  "data": "base64-encoded-image-data",
  "mimeType": "image/jpeg"
}
```

#### Audio Content

```json
{
  "type": "audio",
  "data": "base64-encoded-audio-data",
  "mimeType": "audio/wav"
}
```

### Model Preferences

Model selection in MCP requires careful abstraction since servers and clients may use
different AI providers with distinct model offerings. A server cannot simply request a
specific model by name since the client may not have access to that exact model or may
prefer to use a different provider's equivalent model.

To solve this, MCP implements a preference system that combines abstract capability
priorities with optional model hints:

#### Capability Priorities

Servers express their needs through three normalized priority values (0-1):

* `costPriority`: How important is minimizing costs? Higher values prefer cheaper models.
* `speedPriority`: How important is low latency? Higher values prefer faster models.
* `intelligencePriority`: How important are advanced capabilities? Higher values prefer
  more capable models.

#### Model Hints

While priorities help select models based on characteristics, `hints` allow servers to
suggest specific models or model families:

* Hints are treated as substrings that can match model names flexibly
* Multiple hints are evaluated in order of preference
* Clients **MAY** map hints to equivalent models from different providers
* Hints are advisory—clients make final model selection

For example:

```json
{
  "hints": [
    { "name": "claude-3-sonnet" }, // Prefer Sonnet-class models
    { "name": "claude" } // Fall back to any Claude model
  ],
  "costPriority": 0.3, // Cost is less important
  "speedPriority": 0.8, // Speed is very important
  "intelligencePriority": 0.5 // Moderate capability needs
}
```

The client processes these preferences to select an appropriate model from its available
options. For instance, if the client doesn't have access to Claude models but has Gemini,
it might map the sonnet hint to `gemini-1.5-pro` based on similar capabilities.

## Error Handling

Clients **SHOULD** return errors for common failure cases:

Example error:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -1,
    "message": "User rejected sampling request"
  }
}
```

## Security Considerations

1. Clients **SHOULD** implement user approval controls
2. Both parties **SHOULD** validate message content
3. Clients **SHOULD** respect model preference hints
4. Clients **SHOULD** implement rate limiting
5. Both parties **MUST** handle sensitive data appropriately


# Specification
Source: https://modelcontextprotocol.io/specification/2025-06-18/index



<div id="enable-section-numbers" />

[Model Context Protocol](https://modelcontextprotocol.io) (MCP) is an open protocol that
enables seamless integration between LLM applications and external data sources and
tools. Whether you're building an AI-powered IDE, enhancing a chat interface, or creating
custom AI workflows, MCP provides a standardized way to connect LLMs with the context
they need.

This specification defines the authoritative protocol requirements, based on the
TypeScript schema in
[schema.ts](https://github.com/modelcontextprotocol/specification/blob/main/schema/2025-06-18/schema.ts).

For implementation guides and examples, visit
[modelcontextprotocol.io](https://modelcontextprotocol.io).

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD
NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
interpreted as described in [BCP 14](https://datatracker.ietf.org/doc/html/bcp14)
\[[RFC2119](https://datatracker.ietf.org/doc/html/rfc2119)]
\[[RFC8174](https://datatracker.ietf.org/doc/html/rfc8174)] when, and only when, they
appear in all capitals, as shown here.

## Overview

MCP provides a standardized way for applications to:

* Share contextual information with language models
* Expose tools and capabilities to AI systems
* Build composable integrations and workflows

The protocol uses [JSON-RPC](https://www.jsonrpc.org/) 2.0 messages to establish
communication between:

* **Hosts**: LLM applications that initiate connections
* **Clients**: Connectors within the host application
* **Servers**: Services that provide context and capabilities

MCP takes some inspiration from the
[Language Server Protocol](https://microsoft.github.io/language-server-protocol/), which
standardizes how to add support for programming languages across a whole ecosystem of
development tools. In a similar way, MCP standardizes how to integrate additional context
and tools into the ecosystem of AI applications.

## Key Details

### Base Protocol

* [JSON-RPC](https://www.jsonrpc.org/) message format
* Stateful connections
* Server and client capability negotiation

### Features

Servers offer any of the following features to clients:

* **Resources**: Context and data, for the user or the AI model to use
* **Prompts**: Templated messages and workflows for users
* **Tools**: Functions for the AI model to execute

Clients may offer the following features to servers:

* **Sampling**: Server-initiated agentic behaviors and recursive LLM interactions
* **Roots**: Server-initiated inquiries into uri or filesystem boundaries to operate in
* **Elicitation**: Server-initiated requests for additional information from users

### Additional Utilities

* Configuration
* Progress tracking
* Cancellation
* Error reporting
* Logging

## Security and Trust & Safety

The Model Context Protocol enables powerful capabilities through arbitrary data access
and code execution paths. With this power comes important security and trust
considerations that all implementors must carefully address.

### Key Principles

1. **User Consent and Control**
   * Users must explicitly consent to and understand all data access and operations
   * Users must retain control over what data is shared and what actions are taken
   * Implementors should provide clear UIs for reviewing and authorizing activities

2. **Data Privacy**
   * Hosts must obtain explicit user consent before exposing user data to servers
   * Hosts must not transmit resource data elsewhere without user consent
   * User data should be protected with appropriate access controls

3. **Tool Safety**
   * Tools represent arbitrary code execution and must be treated with appropriate
     caution.
     * In particular, descriptions of tool behavior such as annotations should be
       considered untrusted, unless obtained from a trusted server.
   * Hosts must obtain explicit user consent before invoking any tool
   * Users should understand what each tool does before authorizing its use

4. **LLM Sampling Controls**
   * Users must explicitly approve any LLM sampling requests
   * Users should control:
     * Whether sampling occurs at all
     * The actual prompt that will be sent
     * What results the server can see
   * The protocol intentionally limits server visibility into prompts

### Implementation Guidelines

While MCP itself cannot enforce these security principles at the protocol level,
implementors **SHOULD**:

1. Build robust consent and authorization flows into their applications
2. Provide clear documentation of security implications
3. Implement appropriate access controls and data protections
4. Follow security best practices in their integrations
5. Consider privacy implications in their feature designs

## Learn More

Explore the detailed specification for each protocol component:

<CardGroup cols={5}>
  <Card title="Architecture" icon="sitemap" href="/specification/2025-06-18/architecture" />

  <Card title="Base Protocol" icon="code" href="/specification/2025-06-18/basic" />

  <Card title="Server Features" icon="server" href="/specification/2025-06-18/server" />

  <Card title="Client Features" icon="user" href="/specification/2025-06-18/client" />

  <Card title="Contributing" icon="pencil" href="/community/communication" />
</CardGroup>


# Schema Reference
Source: https://modelcontextprotocol.io/specification/2025-06-18/schema



<div id="schema-reference" />

## Common Types

### `Annotations`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">Annotations</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#annotations-audience">audience</a><span class="tsd-signature-symbol">?:</span> <a href="#role" class="tsd-signature-type tsd-kind-type-alias">Role</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#annotations-lastmodified">lastModified</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#annotations-priority">priority</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Optional annotations for the client. The client can use annotations to inform how objects are used or displayed</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="annotations-audience"><code class="tsd-tag">Optional</code><span>audience</span><a href="#annotations-audience" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">audience</span><span class="tsd-signature-symbol">?:</span> <a href="#role" class="tsd-signature-type tsd-kind-type-alias">Role</a><span class="tsd-signature-symbol">\[]</span></div><div class="tsd-comment tsd-typography"><p>Describes who the intended customer of this object or data is.</p> <p>It can include multiple entries to indicate content useful for multiple audiences (e.g., <code>\["user", "assistant"]</code>).</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="annotations-lastmodified"><code class="tsd-tag">Optional</code><span>last<wbr />Modified</span><a href="#annotations-lastmodified" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">lastModified</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The moment the resource was last modified, as an ISO 8601 formatted string.</p> <p>Should be an ISO 8601 formatted string (e.g., "2025-01-12T15:00:58Z").</p> <p>Examples: last activity timestamp in an open file, timestamp when the resource
was attached, etc.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="annotations-priority"><code class="tsd-tag">Optional</code><span>priority</span><a href="#annotations-priority" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">priority</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>Describes how important this data is for operating the server.</p> <p>A value of 1 means "most important," and indicates that the data is
effectively required, while 0 means "least important," and indicates that
the data is entirely optional.</p> </div><div class="tsd-comment tsd-typography"><div class="tsd-tag-TJS-type"><div data-typedoc-h="4" class="tsd-anchor-link" id="tjs-type">TJS-type<a href="#tjs-type" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><p>number</p> </div></div></section>

### `AudioContent`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">AudioContent</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#audiocontent-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#audiocontent-annotations">annotations</a><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#audiocontent-data">data</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#audiocontent-mimetype">mimeType</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"audio"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Audio provided to or from an LLM.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="audiocontent-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#audiocontent-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="audiocontent-annotations"><code class="tsd-tag">Optional</code><span>annotations</span><a href="#audiocontent-annotations" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">annotations</span><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a></div><div class="tsd-comment tsd-typography"><p>Optional annotations for the client.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="audiocontent-data"><span>data</span><a href="#audiocontent-data" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">data</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The base64-encoded audio data.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="audiocontent-mimetype"><span>mime<wbr />Type</span><a href="#audiocontent-mimetype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">mimeType</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The MIME type of the audio. Different providers may support different audio types.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `BlobResourceContents`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">BlobResourceContents</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#blobresourcecontents-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#blobresourcecontents-blob">blob</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#blobresourcecontents-mimetype">mimeType</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#blobresourcecontents-uri">uri</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The contents of a specific resource or sub-resource.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="blobresourcecontents-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#blobresourcecontents-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resourcecontents">ResourceContents</a>.<a href="#resourcecontents-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="blobresourcecontents-blob"><span>blob</span><a href="#blobresourcecontents-blob" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">blob</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A base64-encoded string representing the binary data of the item.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="blobresourcecontents-mimetype"><code class="tsd-tag">Optional</code><span>mime<wbr />Type</span><a href="#blobresourcecontents-mimetype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">mimeType</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The MIME type of this resource, if known.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resourcecontents">ResourceContents</a>.<a href="#resourcecontents-mimetype">mimeType</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="blobresourcecontents-uri"><span>uri</span><a href="#blobresourcecontents-uri" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of this resource.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resourcecontents">ResourceContents</a>.<a href="#resourcecontents-uri">uri</a></p></aside></section>

### `BooleanSchema`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">BooleanSchema</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">default</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"boolean"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div>

### `ClientCapabilities`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ClientCapabilities</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#clientcapabilities-elicitation">elicitation</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#clientcapabilities-experimental">experimental</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">object</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#clientcapabilities-roots">roots</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#clientcapabilities-sampling">sampling</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Capabilities a client may support. Known capabilities are defined here, in this schema, but this is not a closed set: any client can define its own, additional capabilities.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="clientcapabilities-elicitation"><code class="tsd-tag">Optional</code><span>elicitation</span><a href="#clientcapabilities-elicitation" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">elicitation</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span></div><div class="tsd-comment tsd-typography"><p>Present if the client supports elicitation from the server.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="clientcapabilities-experimental"><code class="tsd-tag">Optional</code><span>experimental</span><a href="#clientcapabilities-experimental" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">experimental</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">object</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Experimental, non-standard capabilities that the client supports.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="clientcapabilities-roots"><code class="tsd-tag">Optional</code><span>roots</span><a href="#clientcapabilities-roots" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">roots</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Present if the client supports listing roots.</p> </div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Whether the client supports notifications for changes to the roots list.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="clientcapabilities-sampling"><code class="tsd-tag">Optional</code><span>sampling</span><a href="#clientcapabilities-sampling" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">sampling</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span></div><div class="tsd-comment tsd-typography"><p>Present if the client supports sampling from an LLM.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `ContentBlock`

<div class="tsd-signature"><span class="tsd-kind-type-alias">ContentBlock</span><span class="tsd-signature-symbol">:</span><br />  <span class="tsd-signature-symbol">|</span> <a href="#textcontent" class="tsd-signature-type tsd-kind-interface">TextContent</a><br />  <span class="tsd-signature-symbol">|</span> <a href="#imagecontent" class="tsd-signature-type tsd-kind-interface">ImageContent</a><br />  <span class="tsd-signature-symbol">|</span> <a href="#audiocontent" class="tsd-signature-type tsd-kind-interface">AudioContent</a><br />  <span class="tsd-signature-symbol">|</span> <a href="#resourcelink" class="tsd-signature-type tsd-kind-interface">ResourceLink</a><br />  <span class="tsd-signature-symbol">|</span> <a href="#embeddedresource" class="tsd-signature-type tsd-kind-interface">EmbeddedResource</a></div>

### `Cursor`

<div class="tsd-signature"><span class="tsd-kind-type-alias">Cursor</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token used to represent a cursor for pagination.</p> </div><div class="tsd-comment tsd-typography" />

### `EmbeddedResource`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">EmbeddedResource</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#embeddedresource-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#embeddedresource-annotations">annotations</a><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">resource</a><span class="tsd-signature-symbol">:</span> <a href="#textresourcecontents" class="tsd-signature-type tsd-kind-interface">TextResourceContents</a> <span class="tsd-signature-symbol">|</span> <a href="#blobresourcecontents" class="tsd-signature-type tsd-kind-interface">BlobResourceContents</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"resource"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The contents of a resource, embedded into a prompt or tool call result.</p> <p>It is up to the client how best to render embedded resources for the benefit
of the LLM and/or the user.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="embeddedresource-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#embeddedresource-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="embeddedresource-annotations"><code class="tsd-tag">Optional</code><span>annotations</span><a href="#embeddedresource-annotations" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">annotations</span><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a></div><div class="tsd-comment tsd-typography"><p>Optional annotations for the client.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `EmptyResult`

<div class="tsd-signature"><span class="tsd-kind-type-alias">EmptyResult</span><span class="tsd-signature-symbol">:</span> <a href="#result" class="tsd-signature-type tsd-kind-interface">Result</a></div><div class="tsd-comment tsd-typography"><p>A response that indicates success but carries no data.</p> </div><div class="tsd-comment tsd-typography" />

### `EnumSchema`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">EnumSchema</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">enum</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">enumNames</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"string"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div>

### `ImageContent`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ImageContent</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#imagecontent-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#imagecontent-annotations">annotations</a><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#imagecontent-data">data</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#imagecontent-mimetype">mimeType</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"image"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>An image provided to or from an LLM.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="imagecontent-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#imagecontent-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="imagecontent-annotations"><code class="tsd-tag">Optional</code><span>annotations</span><a href="#imagecontent-annotations" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">annotations</span><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a></div><div class="tsd-comment tsd-typography"><p>Optional annotations for the client.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="imagecontent-data"><span>data</span><a href="#imagecontent-data" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">data</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The base64-encoded image data.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="imagecontent-mimetype"><span>mime<wbr />Type</span><a href="#imagecontent-mimetype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">mimeType</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The MIME type of the image. Different providers may support different image types.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `Implementation`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">Implementation</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#implementation-name">name</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#implementation-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">version</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Describes the name and version of an MCP implementation, with an optional title for UI representation.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="implementation-name"><span>name</span><a href="#implementation-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.name</p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="implementation-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#implementation-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
even by those unfamiliar with domain-specific terminology.</p> <p>If not provided, the name should be used for display (except for Tool,
where <code>annotations.title</code> should be given precedence over using <code>name</code>,
if present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.title</p></aside></section>

### `JSONRPCError`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">JSONRPCError</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#jsonrpcerror-error">error</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">code</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">data</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">id</a><span class="tsd-signature-symbol">:</span> <a href="#requestid" class="tsd-signature-type tsd-kind-type-alias">RequestId</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">jsonrpc</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"2.0"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A response to a request that indicates an error occurred.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="jsonrpcerror-error"><span>error</span><a href="#jsonrpcerror-error" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">error</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">code</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">data</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">code</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>The error type that occurred.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">data</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">unknown</span></div><div class="tsd-comment tsd-typography"><p>Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A short description of the error. The message SHOULD be limited to a concise single sentence.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div></section>

### `JSONRPCNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">JSONRPCNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">jsonrpc</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"2.0"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#jsonrpcnotification-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A notification which does not expect a response.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="jsonrpcnotification-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#jsonrpcnotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from Notification.params</p></aside></section>

### `JSONRPCRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">JSONRPCRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">id</a><span class="tsd-signature-symbol">:</span> <a href="#requestid" class="tsd-signature-type tsd-kind-type-alias">RequestId</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">jsonrpc</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"2.0"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#jsonrpcrequest-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A request that expects a response.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="jsonrpcrequest-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#jsonrpcrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?: </span><a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a></div><div class="tsd-comment tsd-typography"><p>If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></li></ul></div><aside class="tsd-sources"><p>Inherited from Request.params</p></aside></section>

### `JSONRPCResponse`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">JSONRPCResponse</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">id</a><span class="tsd-signature-symbol">:</span> <a href="#requestid" class="tsd-signature-type tsd-kind-type-alias">RequestId</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">jsonrpc</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"2.0"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">result</a><span class="tsd-signature-symbol">:</span> <a href="#result" class="tsd-signature-type tsd-kind-interface">Result</a><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A successful (non-error) response to a request.</p> </div>

### `LoggingLevel`

<div class="tsd-signature"><span class="tsd-kind-type-alias">LoggingLevel</span><span class="tsd-signature-symbol">:</span><br />  <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"debug"</span><br />  <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"info"</span><br />  <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"notice"</span><br />  <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"warning"</span><br />  <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"error"</span><br />  <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"critical"</span><br />  <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"alert"</span><br />  <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"emergency"</span></div><div class="tsd-comment tsd-typography"><p>The severity of a log message.</p> <p>These map to syslog message severities, as specified in RFC-5424: <a href="https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1">[https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1](https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1)</a></p> </div><div class="tsd-comment tsd-typography" />

### `ModelHint`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ModelHint</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#modelhint-name">name</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Hints to use for model selection.</p> <p>Keys not declared here are currently left unspecified by the spec and are up
to the client to interpret.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="modelhint-name"><code class="tsd-tag">Optional</code><span>name</span><a href="#modelhint-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A hint for a model name.</p> <p>The client SHOULD treat this as a substring of a model name; for example:</p> <ul> <li><code>claude-3-5-sonnet</code> should match <code>claude-3-5-sonnet-20241022</code></li> <li><code>sonnet</code> should match <code>claude-3-5-sonnet-20241022</code>, <code>claude-3-sonnet-20240229</code>, etc.</li> <li><code>claude</code> should match any Claude model</li> </ul> <p>The client MAY also map the string to a different provider's model name or a different model family, as long as it fills a similar niche; for example:</p> <ul> <li><code>gemini-1.5-flash</code> could match <code>claude-3-haiku-20240307</code></li> </ul> </div><div class="tsd-comment tsd-typography" /></section>

### `ModelPreferences`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ModelPreferences</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#modelpreferences-costpriority">costPriority</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#modelpreferences-hints">hints</a><span class="tsd-signature-symbol">?:</span> <a href="#modelhint" class="tsd-signature-type tsd-kind-interface">ModelHint</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#modelpreferences-intelligencepriority">intelligencePriority</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#modelpreferences-speedpriority">speedPriority</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's preferences for model selection, requested of the client during sampling.</p> <p>Because LLMs can vary along multiple dimensions, choosing the "best" model is
rarely straightforward.  Different models excel in different areas—some are
faster but less capable, others are more capable but more expensive, and so
on. This interface allows servers to express their priorities across multiple
dimensions to help clients make an appropriate selection for their use case.</p> <p>These preferences are always advisory. The client MAY ignore them. It is also
up to the client to decide how to interpret these preferences and how to
balance them against other considerations.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="modelpreferences-costpriority"><code class="tsd-tag">Optional</code><span>cost<wbr />Priority</span><a href="#modelpreferences-costpriority" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">costPriority</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>How much to prioritize cost when selecting a model. A value of 0 means cost
is not important, while a value of 1 means cost is the most important
factor.</p> </div><div class="tsd-comment tsd-typography"><div class="tsd-tag-TJS-type"><div data-typedoc-h="4" class="tsd-anchor-link" id="tjs-type">TJS-type<a href="#tjs-type" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><p>number</p> </div></div></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="modelpreferences-hints"><code class="tsd-tag">Optional</code><span>hints</span><a href="#modelpreferences-hints" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">hints</span><span class="tsd-signature-symbol">?:</span> <a href="#modelhint" class="tsd-signature-type tsd-kind-interface">ModelHint</a><span class="tsd-signature-symbol">\[]</span></div><div class="tsd-comment tsd-typography"><p>Optional hints to use for model selection.</p> <p>If multiple hints are specified, the client MUST evaluate them in order
(such that the first match is taken).</p> <p>The client SHOULD prioritize these hints over the numeric priorities, but
MAY still use the priorities to select from ambiguous matches.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="modelpreferences-intelligencepriority"><code class="tsd-tag">Optional</code><span>intelligence<wbr />Priority</span><a href="#modelpreferences-intelligencepriority" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">intelligencePriority</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>How much to prioritize intelligence and capabilities when selecting a
model. A value of 0 means intelligence is not important, while a value of 1
means intelligence is the most important factor.</p> </div><div class="tsd-comment tsd-typography"><div class="tsd-tag-TJS-type"><div data-typedoc-h="4" class="tsd-anchor-link" id="tjs-type-1">TJS-type<a href="#tjs-type-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><p>number</p> </div></div></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="modelpreferences-speedpriority"><code class="tsd-tag">Optional</code><span>speed<wbr />Priority</span><a href="#modelpreferences-speedpriority" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">speedPriority</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>How much to prioritize sampling speed (latency) when selecting a model. A
value of 0 means speed is not important, while a value of 1 means speed is
the most important factor.</p> </div><div class="tsd-comment tsd-typography"><div class="tsd-tag-TJS-type"><div data-typedoc-h="4" class="tsd-anchor-link" id="tjs-type-2">TJS-type<a href="#tjs-type-2" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><p>number</p> </div></div></section>

### `NumberSchema`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">NumberSchema</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">maximum</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">minimum</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"number"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"integer"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div>

### `PrimitiveSchemaDefinition`

<div class="tsd-signature"><span class="tsd-kind-type-alias">PrimitiveSchemaDefinition</span><span class="tsd-signature-symbol">:</span><br />  <span class="tsd-signature-symbol">|</span> <a href="#stringschema" class="tsd-signature-type tsd-kind-interface">StringSchema</a><br />  <span class="tsd-signature-symbol">|</span> <a href="#numberschema" class="tsd-signature-type tsd-kind-interface">NumberSchema</a><br />  <span class="tsd-signature-symbol">|</span> <a href="#booleanschema" class="tsd-signature-type tsd-kind-interface">BooleanSchema</a><br />  <span class="tsd-signature-symbol">|</span> <a href="#enumschema" class="tsd-signature-type tsd-kind-interface">EnumSchema</a></div><div class="tsd-comment tsd-typography"><p>Restricted schema definitions that only allow primitive types
without nested objects or arrays.</p> </div><div class="tsd-comment tsd-typography" />

### `ProgressToken`

<div class="tsd-signature"><span class="tsd-kind-type-alias">ProgressToken</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>A progress token, used to associate progress notifications with the original request.</p> </div><div class="tsd-comment tsd-typography" />

### `Prompt`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">Prompt</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#prompt-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#prompt-arguments">arguments</a><span class="tsd-signature-symbol">?:</span> <a href="#promptargument" class="tsd-signature-type tsd-kind-interface">PromptArgument</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#prompt-description">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#prompt-name">name</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#prompt-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A prompt or prompt template that the server offers.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="prompt-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#prompt-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="prompt-arguments"><code class="tsd-tag">Optional</code><span>arguments</span><a href="#prompt-arguments" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?:</span> <a href="#promptargument" class="tsd-signature-type tsd-kind-interface">PromptArgument</a><span class="tsd-signature-symbol">\[]</span></div><div class="tsd-comment tsd-typography"><p>A list of arguments to use for templating the prompt.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="prompt-description"><code class="tsd-tag">Optional</code><span>description</span><a href="#prompt-description" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">description</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An optional description of what this prompt provides</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="prompt-name"><span>name</span><a href="#prompt-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.name</p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="prompt-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#prompt-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
even by those unfamiliar with domain-specific terminology.</p> <p>If not provided, the name should be used for display (except for Tool,
where <code>annotations.title</code> should be given precedence over using <code>name</code>,
if present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.title</p></aside></section>

### `PromptArgument`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">PromptArgument</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#promptargument-description">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#promptargument-name">name</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#promptargument-required">required</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#promptargument-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Describes an argument that a prompt can accept.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="promptargument-description"><code class="tsd-tag">Optional</code><span>description</span><a href="#promptargument-description" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">description</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A human-readable description of the argument.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="promptargument-name"><span>name</span><a href="#promptargument-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.name</p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="promptargument-required"><code class="tsd-tag">Optional</code><span>required</span><a href="#promptargument-required" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">required</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Whether this argument must be provided.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="promptargument-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#promptargument-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
even by those unfamiliar with domain-specific terminology.</p> <p>If not provided, the name should be used for display (except for Tool,
where <code>annotations.title</code> should be given precedence over using <code>name</code>,
if present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.title</p></aside></section>

### `PromptMessage`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">PromptMessage</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">content</a><span class="tsd-signature-symbol">:</span> <a href="#contentblock" class="tsd-signature-type tsd-kind-type-alias">ContentBlock</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">role</a><span class="tsd-signature-symbol">:</span> <a href="#role" class="tsd-signature-type tsd-kind-type-alias">Role</a><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Describes a message returned as part of a prompt.</p> <p>This is similar to <code>SamplingMessage</code>, but also supports the embedding of
resources from the MCP server.</p> </div>

### `PromptReference`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">PromptReference</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#promptreference-name">name</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#promptreference-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"ref/prompt"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Identifies a prompt.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="promptreference-name"><span>name</span><a href="#promptreference-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.name</p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="promptreference-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#promptreference-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
even by those unfamiliar with domain-specific terminology.</p> <p>If not provided, the name should be used for display (except for Tool,
where <code>annotations.title</code> should be given precedence over using <code>name</code>,
if present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.title</p></aside></section>

### `RequestId`

<div class="tsd-signature"><span class="tsd-kind-type-alias">RequestId</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>A uniquely identifying ID for a request in JSON-RPC.</p> </div><div class="tsd-comment tsd-typography" />

### `Resource`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">Resource</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#resource-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resource-annotations">annotations</a><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resource-description">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resource-mimetype">mimeType</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resource-name">name</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resource-size">size</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resource-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resource-uri">uri</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A known resource that the server is capable of reading.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resource-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#resource-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resource-annotations"><code class="tsd-tag">Optional</code><span>annotations</span><a href="#resource-annotations" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">annotations</span><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a></div><div class="tsd-comment tsd-typography"><p>Optional annotations for the client.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resource-description"><code class="tsd-tag">Optional</code><span>description</span><a href="#resource-description" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">description</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A description of what this resource represents.</p> <p>This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resource-mimetype"><code class="tsd-tag">Optional</code><span>mime<wbr />Type</span><a href="#resource-mimetype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">mimeType</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The MIME type of this resource, if known.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resource-name"><span>name</span><a href="#resource-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.name</p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resource-size"><code class="tsd-tag">Optional</code><span>size</span><a href="#resource-size" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">size</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>The size of the raw resource content, in bytes (i.e., before base64 encoding or any tokenization), if known.</p> <p>This can be used by Hosts to display file sizes and estimate context window usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resource-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#resource-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
even by those unfamiliar with domain-specific terminology.</p> <p>If not provided, the name should be used for display (except for Tool,
where <code>annotations.title</code> should be given precedence over using <code>name</code>,
if present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.title</p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resource-uri"><span>uri</span><a href="#resource-uri" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of this resource.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `ResourceContents`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ResourceContents</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#resourcecontents-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcecontents-mimetype">mimeType</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcecontents-uri">uri</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The contents of a specific resource or sub-resource.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcecontents-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#resourcecontents-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcecontents-mimetype"><code class="tsd-tag">Optional</code><span>mime<wbr />Type</span><a href="#resourcecontents-mimetype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">mimeType</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The MIME type of this resource, if known.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcecontents-uri"><span>uri</span><a href="#resourcecontents-uri" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of this resource.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `ResourceLink`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ResourceLink</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#resourcelink-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcelink-annotations">annotations</a><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcelink-description">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcelink-mimetype">mimeType</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcelink-name">name</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcelink-size">size</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcelink-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"resource\_link"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcelink-uri">uri</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A resource that the server is capable of reading, included in a prompt or tool call result.</p> <p>Note: resource links returned by tools are not guaranteed to appear in the results of <code>resources/list</code> requests.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelink-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#resourcelink-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelink-annotations"><code class="tsd-tag">Optional</code><span>annotations</span><a href="#resourcelink-annotations" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">annotations</span><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a></div><div class="tsd-comment tsd-typography"><p>Optional annotations for the client.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-annotations">annotations</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelink-description"><code class="tsd-tag">Optional</code><span>description</span><a href="#resourcelink-description" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">description</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A description of what this resource represents.</p> <p>This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-description">description</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelink-mimetype"><code class="tsd-tag">Optional</code><span>mime<wbr />Type</span><a href="#resourcelink-mimetype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">mimeType</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The MIME type of this resource, if known.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-mimetype">mimeType</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelink-name"><span>name</span><a href="#resourcelink-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-name">name</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelink-size"><code class="tsd-tag">Optional</code><span>size</span><a href="#resourcelink-size" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">size</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>The size of the raw resource content, in bytes (i.e., before base64 encoding or any tokenization), if known.</p> <p>This can be used by Hosts to display file sizes and estimate context window usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-size">size</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelink-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#resourcelink-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
even by those unfamiliar with domain-specific terminology.</p> <p>If not provided, the name should be used for display (except for Tool,
where <code>annotations.title</code> should be given precedence over using <code>name</code>,
if present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-title">title</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelink-uri"><span>uri</span><a href="#resourcelink-uri" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of this resource.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resource">Resource</a>.<a href="#resource-uri">uri</a></p></aside></section>

### `ResourceTemplate`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ResourceTemplate</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#resourcetemplate-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcetemplate-annotations">annotations</a><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcetemplate-description">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcetemplate-mimetype">mimeType</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcetemplate-name">name</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcetemplate-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcetemplate-uritemplate">uriTemplate</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A template description for resources available on the server.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcetemplate-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#resourcetemplate-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcetemplate-annotations"><code class="tsd-tag">Optional</code><span>annotations</span><a href="#resourcetemplate-annotations" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">annotations</span><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a></div><div class="tsd-comment tsd-typography"><p>Optional annotations for the client.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcetemplate-description"><code class="tsd-tag">Optional</code><span>description</span><a href="#resourcetemplate-description" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">description</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A description of what this template is for.</p> <p>This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcetemplate-mimetype"><code class="tsd-tag">Optional</code><span>mime<wbr />Type</span><a href="#resourcetemplate-mimetype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">mimeType</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The MIME type for all resources that match this template. This should only be included if all resources matching this template have the same type.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcetemplate-name"><span>name</span><a href="#resourcetemplate-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.name</p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcetemplate-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#resourcetemplate-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
even by those unfamiliar with domain-specific terminology.</p> <p>If not provided, the name should be used for display (except for Tool,
where <code>annotations.title</code> should be given precedence over using <code>name</code>,
if present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.title</p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcetemplate-uritemplate"><span>uri<wbr />Template</span><a href="#resourcetemplate-uritemplate" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">uriTemplate</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A URI template (according to RFC 6570) that can be used to construct resource URIs.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `ResourceTemplateReference`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ResourceTemplateReference</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"ref/resource"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcetemplatereference-uri">uri</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A reference to a resource or resource template definition.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcetemplatereference-uri"><span>uri</span><a href="#resourcetemplatereference-uri" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI or URI template of the resource.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `Result`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">Result</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#result-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="result-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#result-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `Role`

<div class="tsd-signature"><span class="tsd-kind-type-alias">Role</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"user"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"assistant"</span></div><div class="tsd-comment tsd-typography"><p>The sender or recipient of messages and data in a conversation.</p> </div><div class="tsd-comment tsd-typography" />

### `Root`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">Root</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#root-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#root-name">name</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#root-uri">uri</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Represents a root directory or file that the server can operate on.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="root-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#root-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="root-name"><code class="tsd-tag">Optional</code><span>name</span><a href="#root-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An optional name for the root. This can be used to provide a human-readable
identifier for the root, which may be useful for display purposes or for
referencing the root in other parts of the application.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="root-uri"><span>uri</span><a href="#root-uri" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI identifying the root. This <em>must</em> start with file:// for now.
This restriction may be relaxed in future versions of the protocol to allow
other URI schemes.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `SamplingMessage`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">SamplingMessage</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">content</a><span class="tsd-signature-symbol">:</span> <a href="#textcontent" class="tsd-signature-type tsd-kind-interface">TextContent</a> <span class="tsd-signature-symbol">|</span> <a href="#imagecontent" class="tsd-signature-type tsd-kind-interface">ImageContent</a> <span class="tsd-signature-symbol">|</span> <a href="#audiocontent" class="tsd-signature-type tsd-kind-interface">AudioContent</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">role</a><span class="tsd-signature-symbol">:</span> <a href="#role" class="tsd-signature-type tsd-kind-type-alias">Role</a><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Describes a message issued to or received from an LLM API.</p> </div>

### `ServerCapabilities`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ServerCapabilities</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#servercapabilities-completions">completions</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#servercapabilities-experimental">experimental</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">object</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#servercapabilities-logging">logging</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#servercapabilities-prompts">prompts</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#servercapabilities-resources">resources</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">subscribe</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#servercapabilities-tools">tools</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Capabilities that a server may support. Known capabilities are defined here, in this schema, but this is not a closed set: any server can define its own, additional capabilities.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="servercapabilities-completions"><code class="tsd-tag">Optional</code><span>completions</span><a href="#servercapabilities-completions" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">completions</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span></div><div class="tsd-comment tsd-typography"><p>Present if the server supports argument autocompletion suggestions.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="servercapabilities-experimental"><code class="tsd-tag">Optional</code><span>experimental</span><a href="#servercapabilities-experimental" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">experimental</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">object</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Experimental, non-standard capabilities that the server supports.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="servercapabilities-logging"><code class="tsd-tag">Optional</code><span>logging</span><a href="#servercapabilities-logging" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">logging</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span></div><div class="tsd-comment tsd-typography"><p>Present if the server supports sending log messages to the client.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="servercapabilities-prompts"><code class="tsd-tag">Optional</code><span>prompts</span><a href="#servercapabilities-prompts" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">prompts</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Present if the server offers any prompt templates.</p> </div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Whether this server supports notifications for changes to the prompt list.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="servercapabilities-resources"><code class="tsd-tag">Optional</code><span>resources</span><a href="#servercapabilities-resources" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">resources</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">subscribe</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Present if the server offers any resources to read.</p> </div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Whether this server supports notifications for changes to the resource list.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">subscribe</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Whether this server supports subscribing to resource updates.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="servercapabilities-tools"><code class="tsd-tag">Optional</code><span>tools</span><a href="#servercapabilities-tools" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">tools</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Present if the server offers any tools to call.</p> </div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">listChanged</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Whether this server supports notifications for changes to the tool list.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><div class="tsd-comment tsd-typography" /></section>

### `StringSchema`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">StringSchema</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">format</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">"uri"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"email"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"date"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"date-time"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">maxLength</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">minLength</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"string"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div>

### `TextContent`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">TextContent</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#textcontent-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#textcontent-annotations">annotations</a><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#textcontent-text">text</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">type</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"text"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Text provided to or from an LLM.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="textcontent-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#textcontent-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="textcontent-annotations"><code class="tsd-tag">Optional</code><span>annotations</span><a href="#textcontent-annotations" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">annotations</span><span class="tsd-signature-symbol">?:</span> <a href="#annotations" class="tsd-signature-type tsd-kind-interface">Annotations</a></div><div class="tsd-comment tsd-typography"><p>Optional annotations for the client.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="textcontent-text"><span>text</span><a href="#textcontent-text" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">text</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The text content of the message.</p> </div><div class="tsd-comment tsd-typography" /></section>

### `TextResourceContents`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">TextResourceContents</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#textresourcecontents-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#textresourcecontents-mimetype">mimeType</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#textresourcecontents-text">text</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#textresourcecontents-uri">uri</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The contents of a specific resource or sub-resource.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="textresourcecontents-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#textresourcecontents-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resourcecontents">ResourceContents</a>.<a href="#resourcecontents-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="textresourcecontents-mimetype"><code class="tsd-tag">Optional</code><span>mime<wbr />Type</span><a href="#textresourcecontents-mimetype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">mimeType</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The MIME type of this resource, if known.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resourcecontents">ResourceContents</a>.<a href="#resourcecontents-mimetype">mimeType</a></p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="textresourcecontents-text"><span>text</span><a href="#textresourcecontents-text" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">text</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The text of the item. This must only be set if the item can actually be represented as text (not binary data).</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="textresourcecontents-uri"><span>uri</span><a href="#textresourcecontents-uri" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of this resource.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#resourcecontents">ResourceContents</a>.<a href="#resourcecontents-uri">uri</a></p></aside></section>

### `Tool`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">Tool</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#tool-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#tool-annotations">annotations</a><span class="tsd-signature-symbol">?:</span> <a href="#toolannotations" class="tsd-signature-type tsd-kind-interface">ToolAnnotations</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#tool-description">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#tool-inputschema">inputSchema</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">properties</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">object</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">required</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">type</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"object"</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#tool-name">name</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#tool-outputschema">outputSchema</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">properties</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">object</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">required</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">type</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"object"</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#tool-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Definition for a tool the client can call.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="tool-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#tool-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="tool-annotations"><code class="tsd-tag">Optional</code><span>annotations</span><a href="#tool-annotations" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">annotations</span><span class="tsd-signature-symbol">?:</span> <a href="#toolannotations" class="tsd-signature-type tsd-kind-interface">ToolAnnotations</a></div><div class="tsd-comment tsd-typography"><p>Optional additional tool information.</p> <p>Display name precedence order is: title, annotations.title, then name.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="tool-description"><code class="tsd-tag">Optional</code><span>description</span><a href="#tool-description" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">description</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A human-readable description of the tool.</p> <p>This can be used by clients to improve the LLM's understanding of available tools. It can be thought of like a "hint" to the model.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="tool-inputschema"><span>input<wbr />Schema</span><a href="#tool-inputschema" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">inputSchema</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">properties</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">object</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">required</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">type</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"object"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A JSON Schema object defining the expected parameters for the tool.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="tool-name"><span>name</span><a href="#tool-name" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.name</p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="tool-outputschema"><code class="tsd-tag">Optional</code><span>output<wbr />Schema</span><a href="#tool-outputschema" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">outputSchema</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">properties</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">object</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">required</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">type</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"object"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>An optional JSON Schema object defining the structure of the tool's output returned in
the structuredContent field of a CallToolResult.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="tool-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#tool-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
even by those unfamiliar with domain-specific terminology.</p> <p>If not provided, the name should be used for display (except for Tool,
where <code>annotations.title</code> should be given precedence over using <code>name</code>,
if present).</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from BaseMetadata.title</p></aside></section>

### `ToolAnnotations`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ToolAnnotations</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#toolannotations-destructivehint">destructiveHint</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#toolannotations-idempotenthint">idempotentHint</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#toolannotations-openworldhint">openWorldHint</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#toolannotations-readonlyhint">readOnlyHint</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#toolannotations-title">title</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Additional properties describing a Tool to clients.</p> <p>NOTE: all properties in ToolAnnotations are <strong>hints</strong>.
They are not guaranteed to provide a faithful description of
tool behavior (including descriptive properties like <code>title</code>).</p> <p>Clients should never make tool use decisions based on ToolAnnotations
received from untrusted servers.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="toolannotations-destructivehint"><code class="tsd-tag">Optional</code><span>destructive<wbr />Hint</span><a href="#toolannotations-destructivehint" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">destructiveHint</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>If true, the tool may perform destructive updates to its environment.
If false, the tool performs only additive updates.</p> <p>(This property is meaningful only when <code>readOnlyHint == false</code>)</p> <p>Default: true</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="toolannotations-idempotenthint"><code class="tsd-tag">Optional</code><span>idempotent<wbr />Hint</span><a href="#toolannotations-idempotenthint" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">idempotentHint</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>If true, calling the tool repeatedly with the same arguments
will have no additional effect on the its environment.</p> <p>(This property is meaningful only when <code>readOnlyHint == false</code>)</p> <p>Default: false</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="toolannotations-openworldhint"><code class="tsd-tag">Optional</code><span>open<wbr />World<wbr />Hint</span><a href="#toolannotations-openworldhint" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">openWorldHint</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>If true, this tool may interact with an "open world" of external
entities. If false, the tool's domain of interaction is closed.
For example, the world of a web search tool is open, whereas that
of a memory tool is not.</p> <p>Default: true</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="toolannotations-readonlyhint"><code class="tsd-tag">Optional</code><span>read<wbr />Only<wbr />Hint</span><a href="#toolannotations-readonlyhint" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">readOnlyHint</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>If true, the tool does not modify its environment.</p> <p>Default: false</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="toolannotations-title"><code class="tsd-tag">Optional</code><span>title</span><a href="#toolannotations-title" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">title</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>A human-readable title for the tool.</p> </div><div class="tsd-comment tsd-typography" /></section>

## `completion/complete`

### `CompleteRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">CompleteRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"completion/complete"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#completerequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">argument</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">value</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">context</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">ref</span><span class="tsd-signature-symbol">:</span> <a href="#promptreference" class="tsd-signature-type tsd-kind-interface">PromptReference</a> <span class="tsd-signature-symbol">|</span> <a href="#resourcetemplatereference" class="tsd-signature-type tsd-kind-interface">ResourceTemplateReference</a><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A request from the client to the server, to ask for completion options.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="completerequest-params"><span>params</span><a href="#completerequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">argument</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">value</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">context</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">ref</span><span class="tsd-signature-symbol">:</span> <a href="#promptreference" class="tsd-signature-type tsd-kind-interface">PromptReference</a> <span class="tsd-signature-symbol">|</span> <a href="#resourcetemplatereference" class="tsd-signature-type tsd-kind-interface">ResourceTemplateReference</a><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">argument</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">value</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The argument's information</p> </div><div class="tsd-comment tsd-typography" /><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The name of the argument</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">value</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The value of the argument to use for completion matching.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">context</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Additional, optional context for completions</p> </div><div class="tsd-comment tsd-typography" /><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Previously-resolved variables in a URI template or prompt.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">ref</span><span class="tsd-signature-symbol">: </span><a href="#promptreference" class="tsd-signature-type tsd-kind-interface">PromptReference</a> <span class="tsd-signature-symbol">|</span> <a href="#resourcetemplatereference" class="tsd-signature-type tsd-kind-interface">ResourceTemplateReference</a></div></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

### `CompleteResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">CompleteResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#completeresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#completeresult-completion">completion</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">hasMore</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">total</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">values</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's response to a completion/complete request</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="completeresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#completeresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#result">Result</a>.<a href="#result-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="completeresult-completion"><span>completion</span><a href="#completeresult-completion" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">completion</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">hasMore</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">total</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">values</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">hasMore</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Indicates whether there are additional completion options beyond those provided in the current response, even if the exact total is unknown.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">total</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>The total number of completion options available. This can exceed the number of values actually sent in the response.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">values</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span></div><div class="tsd-comment tsd-typography"><p>An array of completion values. Must not exceed 100 items.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div></section>

## `elicitation/create`

### `ElicitRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ElicitRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"elicitation/create"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#elicitrequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">requestedSchema</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />      <span class="tsd-kind-property">properties</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <a href="#primitiveschemadefinition" class="tsd-signature-type tsd-kind-type-alias">PrimitiveSchemaDefinition</a> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />      <span class="tsd-kind-property">required</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />      <span class="tsd-kind-property">type</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"object"</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A request from the server to elicit additional information from the user via the client.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="elicitrequest-params"><span>params</span><a href="#elicitrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">requestedSchema</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">properties</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <a href="#primitiveschemadefinition" class="tsd-signature-type tsd-kind-type-alias">PrimitiveSchemaDefinition</a> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">required</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">type</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"object"</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The message to present to the user.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">requestedSchema</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">properties</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <a href="#primitiveschemadefinition" class="tsd-signature-type tsd-kind-type-alias">PrimitiveSchemaDefinition</a> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">required</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">type</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"object"</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A restricted subset of JSON Schema.
Only top-level properties are allowed, without nesting.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

### `ElicitResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ElicitResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#elicitresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#elicitresult-action">action</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"accept"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"decline"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"cancel"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#elicitresult-content">content</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">number</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The client's response to an elicitation request.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="elicitresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#elicitresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#result">Result</a>.<a href="#result-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="elicitresult-action"><span>action</span><a href="#elicitresult-action" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">action</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"accept"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"decline"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"cancel"</span></div><div class="tsd-comment tsd-typography"><p>The user action in response to the elicitation.</p> <ul> <li>"accept": User submitted the form/confirmed the action</li> <li>"decline": User explicitly declined the action</li> <li>"cancel": User dismissed without making an explicit choice</li> </ul> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="elicitresult-content"><code class="tsd-tag">Optional</code><span>content</span><a href="#elicitresult-content" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">content</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">number</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">boolean</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The submitted form data, only present when action is "accept".
Contains values matching the requested schema.</p> </div><div class="tsd-comment tsd-typography" /></section>

## `initialize`

### `InitializeRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">InitializeRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"initialize"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#initializerequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">capabilities</span><span class="tsd-signature-symbol">:</span> <a href="#clientcapabilities" class="tsd-signature-type tsd-kind-interface">ClientCapabilities</a><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">clientInfo</span><span class="tsd-signature-symbol">:</span> <a href="#implementation" class="tsd-signature-type tsd-kind-interface">Implementation</a><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">protocolVersion</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>This request is sent from the client to the server when it first connects, asking it to begin initialization.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="initializerequest-params"><span>params</span><a href="#initializerequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">capabilities</span><span class="tsd-signature-symbol">:</span> <a href="#clientcapabilities" class="tsd-signature-type tsd-kind-interface">ClientCapabilities</a><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">clientInfo</span><span class="tsd-signature-symbol">:</span> <a href="#implementation" class="tsd-signature-type tsd-kind-interface">Implementation</a><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">protocolVersion</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">capabilities</span><span class="tsd-signature-symbol">: </span><a href="#clientcapabilities" class="tsd-signature-type tsd-kind-interface">ClientCapabilities</a></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">clientInfo</span><span class="tsd-signature-symbol">: </span><a href="#implementation" class="tsd-signature-type tsd-kind-interface">Implementation</a></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">protocolVersion</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The latest version of the Model Context Protocol that the client supports. The client MAY decide to support older versions as well.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

### `InitializeResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">InitializeResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#initializeresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">capabilities</a><span class="tsd-signature-symbol">:</span> <a href="#servercapabilities" class="tsd-signature-type tsd-kind-interface">ServerCapabilities</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#initializeresult-instructions">instructions</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#initializeresult-protocolversion">protocolVersion</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">serverInfo</a><span class="tsd-signature-symbol">:</span> <a href="#implementation" class="tsd-signature-type tsd-kind-interface">Implementation</a><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>After receiving an initialize request from the client, the server sends this response.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="initializeresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#initializeresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#result">Result</a>.<a href="#result-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="initializeresult-instructions"><code class="tsd-tag">Optional</code><span>instructions</span><a href="#initializeresult-instructions" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">instructions</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Instructions describing how to use the server and its features.</p> <p>This can be used by clients to improve the LLM's understanding of available tools, resources, etc. It can be thought of like a "hint" to the model. For example, this information MAY be added to the system prompt.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="initializeresult-protocolversion"><span>protocol<wbr />Version</span><a href="#initializeresult-protocolversion" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">protocolVersion</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The version of the Model Context Protocol that the server wants to use. This may not match the version that the client requested. If the client cannot support this version, it MUST disconnect.</p> </div><div class="tsd-comment tsd-typography" /></section>

## `logging/setLevel`

### `SetLevelRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">SetLevelRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"logging/setLevel"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#setlevelrequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">level</span><span class="tsd-signature-symbol">:</span> <a href="#logginglevel" class="tsd-signature-type tsd-kind-type-alias">LoggingLevel</a> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A request from the client to the server, to enable or adjust logging.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="setlevelrequest-params"><span>params</span><a href="#setlevelrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">level</span><span class="tsd-signature-symbol">:</span> <a href="#logginglevel" class="tsd-signature-type tsd-kind-type-alias">LoggingLevel</a> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">level</span><span class="tsd-signature-symbol">: </span><a href="#logginglevel" class="tsd-signature-type tsd-kind-type-alias">LoggingLevel</a></div><div class="tsd-comment tsd-typography"><p>The level of logging that the client wants to receive from the server. The server should send all logs at this level and higher (i.e., more severe) to the client as notifications/message.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

## `notifications/cancelled`

### `CancelledNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">CancelledNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/cancelled"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#cancellednotification-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">reason</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">requestId</span><span class="tsd-signature-symbol">:</span> <a href="#requestid" class="tsd-signature-type tsd-kind-type-alias">RequestId</a> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>This notification can be sent by either side to indicate that it is cancelling a previously-issued request.</p> <p>The request SHOULD still be in-flight, but due to communication latency, it is always possible that this notification MAY arrive after the request has already finished.</p> <p>This notification indicates that the result will be unused, so any associated processing SHOULD cease.</p> <p>A client MUST NOT attempt to cancel its <code>initialize</code> request.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="cancellednotification-params"><span>params</span><a href="#cancellednotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">reason</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">requestId</span><span class="tsd-signature-symbol">:</span> <a href="#requestid" class="tsd-signature-type tsd-kind-type-alias">RequestId</a> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">reason</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An optional string describing the reason for the cancellation. This MAY be logged or presented to the user.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">requestId</span><span class="tsd-signature-symbol">: </span><a href="#requestid" class="tsd-signature-type tsd-kind-type-alias">RequestId</a></div><div class="tsd-comment tsd-typography"><p>The ID of the request to cancel.</p> <p>This MUST correspond to the ID of a request previously issued in the same direction.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Notification.params</p></aside></section>

## `notifications/initialized`

### `InitializedNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">InitializedNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/initialized"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#initializednotification-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>This notification is sent from the client to the server after initialization has finished.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="initializednotification-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#initializednotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from Notification.params</p></aside></section>

## `notifications/message`

### `LoggingMessageNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">LoggingMessageNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/message"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#loggingmessagenotification-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">data</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">level</span><span class="tsd-signature-symbol">:</span> <a href="#logginglevel" class="tsd-signature-type tsd-kind-type-alias">LoggingLevel</a><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">logger</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Notification of a log message passed from server to client. If no logging/setLevel request has been sent from the client, the server MAY decide which messages to send automatically.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="loggingmessagenotification-params"><span>params</span><a href="#loggingmessagenotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">data</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">level</span><span class="tsd-signature-symbol">:</span> <a href="#logginglevel" class="tsd-signature-type tsd-kind-type-alias">LoggingLevel</a><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">logger</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">data</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">unknown</span></div><div class="tsd-comment tsd-typography"><p>The data to be logged, such as a string message or an object. Any JSON serializable type is allowed here.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">level</span><span class="tsd-signature-symbol">: </span><a href="#logginglevel" class="tsd-signature-type tsd-kind-type-alias">LoggingLevel</a></div><div class="tsd-comment tsd-typography"><p>The severity of this log message.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">logger</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An optional name of the logger issuing this message.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Notification.params</p></aside></section>

## `notifications/progress`

### `ProgressNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ProgressNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/progress"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#progressnotification-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">progress</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">total</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>An out-of-band notification used to inform the receiver of a progress update for a long-running request.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="progressnotification-params"><span>params</span><a href="#progressnotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">progress</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">total</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">message</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An optional message describing the current progress.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">progress</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>The progress thus far. This should increase every time progress is made, even if the total is unknown.</p> </div><div class="tsd-comment tsd-typography"><div class="tsd-tag-TJS-type"><div data-typedoc-h="4" class="tsd-anchor-link" id="tjs-type">TJS-type<a href="#tjs-type" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><p>number</p> </div></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">: </span><a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a></div><div class="tsd-comment tsd-typography"><p>The progress token which was given in the initial request, used to associate this notification with the request that is proceeding.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">total</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>Total number of items to process (or total progress required), if known.</p> </div><div class="tsd-comment tsd-typography"><div class="tsd-tag-TJS-type"><div data-typedoc-h="4" class="tsd-anchor-link" id="tjs-type-1">TJS-type<a href="#tjs-type-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><p>number</p> </div></div></li></ul></div><aside class="tsd-sources"><p>Overrides Notification.params</p></aside></section>

## `notifications/prompts/list_changed`

### `PromptListChangedNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">PromptListChangedNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/prompts/list\_changed"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#promptlistchangednotification-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>An optional notification from the server to the client, informing it that the list of prompts it offers has changed. This may be issued by servers without any previous subscription from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="promptlistchangednotification-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#promptlistchangednotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from Notification.params</p></aside></section>

## `notifications/resources/list_changed`

### `ResourceListChangedNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ResourceListChangedNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/resources/list\_changed"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourcelistchangednotification-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>An optional notification from the server to the client, informing it that the list of resources it can read from has changed. This may be issued by servers without any previous subscription from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourcelistchangednotification-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#resourcelistchangednotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from Notification.params</p></aside></section>

## `notifications/resources/updated`

### `ResourceUpdatedNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ResourceUpdatedNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/resources/updated"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#resourceupdatednotification-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A notification from the server to the client, informing it that a resource has changed and may need to be read again. This should only be sent if the client previously sent a resources/subscribe request.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="resourceupdatednotification-params"><span>params</span><a href="#resourceupdatednotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of the resource that has been updated. This might be a sub-resource of the one that the client actually subscribed to.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Notification.params</p></aside></section>

## `notifications/roots/list_changed`

### `RootsListChangedNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">RootsListChangedNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/roots/list\_changed"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#rootslistchangednotification-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A notification from the client to the server, informing it that the list of roots has changed.
This notification should be sent whenever the client adds, removes, or modifies any root.
The server should then request an updated list of roots using the ListRootsRequest.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="rootslistchangednotification-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#rootslistchangednotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from Notification.params</p></aside></section>

## `notifications/tools/list_changed`

### `ToolListChangedNotification`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ToolListChangedNotification</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"notifications/tools/list\_changed"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#toollistchangednotification-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>An optional notification from the server to the client, informing it that the list of tools it offers has changed. This may be issued by servers without any previous subscription from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="toollistchangednotification-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#toollistchangednotification-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from Notification.params</p></aside></section>

## `ping`

### `PingRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">PingRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"ping"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#pingrequest-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A ping, issued by either the server or the client, to check that the other party is still alive. The receiver must promptly respond, or else may be disconnected.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="pingrequest-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#pingrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?: </span><a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a></div><div class="tsd-comment tsd-typography"><p>If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></li></ul></div><aside class="tsd-sources"><p>Inherited from Request.params</p></aside></section>

## `prompts/get`

### `GetPromptRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">GetPromptRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"prompts/get"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#getpromptrequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Used by the client to get a prompt provided by the server.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="getpromptrequest-params"><span>params</span><a href="#getpromptrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Arguments to use for templating the prompt.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The name of the prompt or prompt template.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

### `GetPromptResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">GetPromptResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#getpromptresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#getpromptresult-description">description</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">messages</a><span class="tsd-signature-symbol">:</span> <a href="#promptmessage" class="tsd-signature-type tsd-kind-interface">PromptMessage</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's response to a prompts/get request from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="getpromptresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#getpromptresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#result">Result</a>.<a href="#result-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="getpromptresult-description"><code class="tsd-tag">Optional</code><span>description</span><a href="#getpromptresult-description" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">description</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An optional description for the prompt.</p> </div><div class="tsd-comment tsd-typography" /></section>

## `prompts/list`

### `ListPromptsRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListPromptsRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"prompts/list"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listpromptsrequest-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Sent from the client to request a list of prompts and prompt templates the server has.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listpromptsrequest-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#listpromptsrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token representing the current pagination position.
If provided, the server should return results starting after this cursor.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from PaginatedRequest.params</p></aside></section>

### `ListPromptsResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListPromptsResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#listpromptsresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listpromptsresult-nextcursor">nextCursor</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">prompts</a><span class="tsd-signature-symbol">:</span> <a href="#prompt" class="tsd-signature-type tsd-kind-interface">Prompt</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's response to a prompts/list request from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listpromptsresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#listpromptsresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from PaginatedResult.\_meta</p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listpromptsresult-nextcursor"><code class="tsd-tag">Optional</code><span>next<wbr />Cursor</span><a href="#listpromptsresult-nextcursor" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">nextCursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token representing the pagination position after the last returned result.
If present, there may be more results available.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from PaginatedResult.nextCursor</p></aside></section>

## `resources/list`

### `ListResourcesRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListResourcesRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"resources/list"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listresourcesrequest-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Sent from the client to request a list of resources the server has.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listresourcesrequest-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#listresourcesrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token representing the current pagination position.
If provided, the server should return results starting after this cursor.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from PaginatedRequest.params</p></aside></section>

### `ListResourcesResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListResourcesResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#listresourcesresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listresourcesresult-nextcursor">nextCursor</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">resources</a><span class="tsd-signature-symbol">:</span> <a href="#resource" class="tsd-signature-type tsd-kind-interface">Resource</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's response to a resources/list request from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listresourcesresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#listresourcesresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from PaginatedResult.\_meta</p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listresourcesresult-nextcursor"><code class="tsd-tag">Optional</code><span>next<wbr />Cursor</span><a href="#listresourcesresult-nextcursor" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">nextCursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token representing the pagination position after the last returned result.
If present, there may be more results available.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from PaginatedResult.nextCursor</p></aside></section>

## `resources/read`

### `ReadResourceRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ReadResourceRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"resources/read"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#readresourcerequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Sent from the client to the server, to read a specific resource URI.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="readresourcerequest-params"><span>params</span><a href="#readresourcerequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of the resource to read. The URI can use any protocol; it is up to the server how to interpret it.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

### `ReadResourceResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ReadResourceResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#readresourceresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">contents</a><span class="tsd-signature-symbol">:</span> (<a href="#textresourcecontents" class="tsd-signature-type tsd-kind-interface">TextResourceContents</a> <span class="tsd-signature-symbol">|</span> <a href="#blobresourcecontents" class="tsd-signature-type tsd-kind-interface">BlobResourceContents</a>)<span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's response to a resources/read request from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="readresourceresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#readresourceresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#result">Result</a>.<a href="#result-_meta">\_meta</a></p></aside></section>

## `resources/subscribe`

### `SubscribeRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">SubscribeRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"resources/subscribe"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#subscriberequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Sent from the client to request resources/updated notifications from the server whenever a particular resource changes.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="subscriberequest-params"><span>params</span><a href="#subscriberequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of the resource to subscribe to. The URI can use any protocol; it is up to the server how to interpret it.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

## `resources/templates/list`

### `ListResourceTemplatesRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListResourceTemplatesRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"resources/templates/list"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listresourcetemplatesrequest-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Sent from the client to request a list of resource templates the server has.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listresourcetemplatesrequest-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#listresourcetemplatesrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token representing the current pagination position.
If provided, the server should return results starting after this cursor.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from PaginatedRequest.params</p></aside></section>

### `ListResourceTemplatesResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListResourceTemplatesResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#listresourcetemplatesresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listresourcetemplatesresult-nextcursor">nextCursor</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">resourceTemplates</a><span class="tsd-signature-symbol">:</span> <a href="#resourcetemplate" class="tsd-signature-type tsd-kind-interface">ResourceTemplate</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's response to a resources/templates/list request from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listresourcetemplatesresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#listresourcetemplatesresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from PaginatedResult.\_meta</p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listresourcetemplatesresult-nextcursor"><code class="tsd-tag">Optional</code><span>next<wbr />Cursor</span><a href="#listresourcetemplatesresult-nextcursor" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">nextCursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token representing the pagination position after the last returned result.
If present, there may be more results available.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from PaginatedResult.nextCursor</p></aside></section>

## `resources/unsubscribe`

### `UnsubscribeRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">UnsubscribeRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"resources/unsubscribe"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#unsubscriberequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Sent from the client to request cancellation of resources/updated notifications from the server. This should follow a previous resources/subscribe request.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="unsubscriberequest-params"><span>params</span><a href="#unsubscriberequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">uri</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The URI of the resource to unsubscribe from.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

## `roots/list`

### `ListRootsRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListRootsRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"roots/list"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listrootsrequest-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Sent from the server to request a list of root URIs from the client. Roots allow
servers to ask for specific directories or files to operate on. A common example
for roots is providing a set of repositories or directories a server should operate
on.</p> <p>This request is typically used when the server needs to understand the file system
structure or access specific locations that the client has permission to read from.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listrootsrequest-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#listrootsrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter-index-signature"><div data-typedoc-h="5"><span class="tsd-signature-symbol">\[</span><span class="tsd-kind-parameter">key</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?:</span> <a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a><span class="tsd-signature-symbol">;</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">progressToken</span><span class="tsd-signature-symbol">?: </span><a href="#progresstoken" class="tsd-signature-type tsd-kind-type-alias">ProgressToken</a></div><div class="tsd-comment tsd-typography"><p>If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></li></ul></div><aside class="tsd-sources"><p>Inherited from Request.params</p></aside></section>

### `ListRootsResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListRootsResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#listrootsresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">roots</a><span class="tsd-signature-symbol">:</span> <a href="#root" class="tsd-signature-type tsd-kind-interface">Root</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The client's response to a roots/list request from the server.
This result contains an array of Root objects, each representing a root directory
or file that the server can operate on.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listrootsresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#listrootsresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#result">Result</a>.<a href="#result-_meta">\_meta</a></p></aside></section>

## `sampling/createMessage`

### `CreateMessageRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">CreateMessageRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"sampling/createMessage"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#createmessagerequest-params">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />    <span class="tsd-kind-property">includeContext</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">"none"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"thisServer"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"allServers"</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">maxTokens</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">messages</span><span class="tsd-signature-symbol">:</span> <a href="#samplingmessage" class="tsd-signature-type tsd-kind-interface">SamplingMessage</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">metadata</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">modelPreferences</span><span class="tsd-signature-symbol">?:</span> <a href="#modelpreferences" class="tsd-signature-type tsd-kind-interface">ModelPreferences</a><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">stopSequences</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">systemPrompt</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />    <span class="tsd-kind-property">temperature</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>A request from the server to sample an LLM via the client. The client has full discretion over which model to select. The client should also inform the user before beginning sampling, to allow them to inspect the request (human in the loop) and decide whether to approve it.</p> </div><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="createmessagerequest-params"><span>params</span><a href="#createmessagerequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span><br />  <span class="tsd-kind-property">includeContext</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">"none"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"thisServer"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"allServers"</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">maxTokens</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">messages</span><span class="tsd-signature-symbol">:</span> <a href="#samplingmessage" class="tsd-signature-type tsd-kind-interface">SamplingMessage</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">metadata</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">object</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">modelPreferences</span><span class="tsd-signature-symbol">?:</span> <a href="#modelpreferences" class="tsd-signature-type tsd-kind-interface">ModelPreferences</a><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">stopSequences</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">systemPrompt</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-kind-property">temperature</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">includeContext</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">"none"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"thisServer"</span> <span class="tsd-signature-symbol">|</span> <span class="tsd-signature-type">"allServers"</span></div><div class="tsd-comment tsd-typography"><p>A request to include context from one or more MCP servers (including the caller), to be attached to the prompt. The client MAY ignore this request.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">maxTokens</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>The requested maximum number of tokens to sample (to prevent runaway completions).</p> <p>The client MAY choose to sample fewer tokens than the requested maximum.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><span class="tsd-kind-property">messages</span><span class="tsd-signature-symbol">: </span><a href="#samplingmessage" class="tsd-signature-type tsd-kind-interface">SamplingMessage</a><span class="tsd-signature-symbol">\[]</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">metadata</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">object</span></div><div class="tsd-comment tsd-typography"><p>Optional metadata to pass through to the LLM provider. The format of this metadata is provider-specific.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">modelPreferences</span><span class="tsd-signature-symbol">?: </span><a href="#modelpreferences" class="tsd-signature-type tsd-kind-interface">ModelPreferences</a></div><div class="tsd-comment tsd-typography"><p>The server's preferences for which model to select. The client MAY ignore these preferences.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">stopSequences</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">\[]</span></div></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">systemPrompt</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An optional system prompt the server wants to use for sampling. The client MAY modify or omit this prompt.</p> </div><div class="tsd-comment tsd-typography" /></li><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">temperature</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><div class="tsd-tag-TJS-type"><div data-typedoc-h="4" class="tsd-anchor-link" id="tjs-type">TJS-type<a href="#tjs-type" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><p>number</p> </div></div></li></ul></div><aside class="tsd-sources"><p>Overrides Request.params</p></aside></section>

### `CreateMessageResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">CreateMessageResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#createmessageresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">content</a><span class="tsd-signature-symbol">:</span> <a href="#textcontent" class="tsd-signature-type tsd-kind-interface">TextContent</a> <span class="tsd-signature-symbol">|</span> <a href="#imagecontent" class="tsd-signature-type tsd-kind-interface">ImageContent</a> <span class="tsd-signature-symbol">|</span> <a href="#audiocontent" class="tsd-signature-type tsd-kind-interface">AudioContent</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#createmessageresult-model">model</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">role</a><span class="tsd-signature-symbol">:</span> <a href="#role" class="tsd-signature-type tsd-kind-type-alias">Role</a><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#createmessageresult-stopreason">stopReason</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The client's response to a sampling/create\_message request from the server. The client should inform the user before returning the sampled message, to allow them to inspect the response (human in the loop) and decide whether to allow the server to see it.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="createmessageresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#createmessageresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#result">Result</a>.<a href="#result-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="createmessageresult-model"><span>model</span><a href="#createmessageresult-model" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">model</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The name of the model that generated the message.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="createmessageresult-stopreason"><code class="tsd-tag">Optional</code><span>stop<wbr />Reason</span><a href="#createmessageresult-stopreason" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">stopReason</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>The reason why sampling stopped, if known.</p> </div><div class="tsd-comment tsd-typography" /></section>

## `tools/call`

### `CallToolRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">CallToolRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"tools/call"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">params</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">arguments</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span> <span class="tsd-kind-property">name</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Used by the client to invoke a tool provided by the server.</p> </div>

### `CallToolResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">CallToolResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#calltoolresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#calltoolresult-content">content</a><span class="tsd-signature-symbol">:</span> <a href="#contentblock" class="tsd-signature-type tsd-kind-type-alias">ContentBlock</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#calltoolresult-iserror">isError</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#calltoolresult-structuredcontent">structuredContent</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's response to a tool call.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="calltoolresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#calltoolresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from <a href="#result">Result</a>.<a href="#result-_meta">\_meta</a></p></aside></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="calltoolresult-content"><span>content</span><a href="#calltoolresult-content" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">content</span><span class="tsd-signature-symbol">:</span> <a href="#contentblock" class="tsd-signature-type tsd-kind-type-alias">ContentBlock</a><span class="tsd-signature-symbol">\[]</span></div><div class="tsd-comment tsd-typography"><p>A list of content objects that represent the unstructured result of the tool call.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="calltoolresult-iserror"><code class="tsd-tag">Optional</code><span>is<wbr />Error</span><a href="#calltoolresult-iserror" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">isError</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Whether the tool call ended in an error.</p> <p>If not set, this is assumed to be false (the call was successful).</p> <p>Any errors that originate from the tool SHOULD be reported inside the result
object, with <code>isError</code> set to true, <em>not</em> as an MCP protocol-level error
response. Otherwise, the LLM would not be able to see that an error occurred
and self-correct.</p> <p>However, any errors in <em>finding</em> the tool, an error indicating that the
server does not support tool calls, or any other exceptional conditions,
should be reported as an MCP error response.</p> </div><div class="tsd-comment tsd-typography" /></section><section class="tsd-panel tsd-member"><div data-typedoc-h="3" class="tsd-anchor-link" id="calltoolresult-structuredcontent"><code class="tsd-tag">Optional</code><span>structured<wbr />Content</span><a href="#calltoolresult-structuredcontent" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">structuredContent</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>An optional JSON object that represents the structured result of the tool call.</p> </div><div class="tsd-comment tsd-typography" /></section>

## `tools/list`

### `ListToolsRequest`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListToolsRequest</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#">method</a><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">"tools/list"</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listtoolsrequest-params">params</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>Sent from the client to request a list of tools the server has.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listtoolsrequest-params"><code class="tsd-tag">Optional</code><span>params</span><a href="#listtoolsrequest-params" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">params</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-type-declaration"><div data-typedoc-h="4">Type declaration</div><ul class="tsd-parameters"><li class="tsd-parameter"><div data-typedoc-h="5"><code class="tsd-tag">Optional</code><span class="tsd-kind-property">cursor</span><span class="tsd-signature-symbol">?: </span><span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token representing the current pagination position.
If provided, the server should return results starting after this cursor.</p> </div><div class="tsd-comment tsd-typography" /></li></ul></div><aside class="tsd-sources"><p>Inherited from PaginatedRequest.params</p></aside></section>

### `ListToolsResult`

<div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">ListToolsResult</span> <span class="tsd-signature-symbol">\{</span><br />  <a class="tsd-kind-property" href="#listtoolsresult-_meta">\_meta</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#listtoolsresult-nextcursor">nextCursor</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br />  <a class="tsd-kind-property" href="#">tools</a><span class="tsd-signature-symbol">:</span> <a href="#tool" class="tsd-signature-type tsd-kind-interface">Tool</a><span class="tsd-signature-symbol">\[]</span><span class="tsd-signature-symbol">;</span><br />  <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">;</span><br /><span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>The server's response to a tools/list request from the client.</p> </div><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listtoolsresult-_meta"><code class="tsd-tag">Optional</code><span>\_<wbr />meta</span><a href="#listtoolsresult-_meta" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">\_meta</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-symbol">\{</span> <span class="tsd-signature-symbol">\[</span><span class="tsd-kind-index-signature">key</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">]:</span> <span class="tsd-signature-type">unknown</span> <span class="tsd-signature-symbol">}</span></div><div class="tsd-comment tsd-typography"><p>See <a href="/specification/2025-06-18/basic/index#meta">General fields: <code>\_meta</code></a> for notes on <code>\_meta</code> usage.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from PaginatedResult.\_meta</p></aside></section><section class="tsd-panel tsd-member tsd-is-inherited"><div data-typedoc-h="3" class="tsd-anchor-link" id="listtoolsresult-nextcursor"><code class="tsd-tag">Optional</code><span>next<wbr />Cursor</span><a href="#listtoolsresult-nextcursor" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="assets/icons.svg#icon-anchor" /></svg></a></div><div class="tsd-signature"><span class="tsd-kind-property">nextCursor</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>An opaque token representing the pagination position after the last returned result.
If present, there may be more results available.</p> </div><div class="tsd-comment tsd-typography" /><aside class="tsd-sources"><p>Inherited from PaginatedResult.nextCursor</p></aside></section>


# Overview
Source: https://modelcontextprotocol.io/specification/2025-06-18/server/index



<Info>**Protocol Revision**: 2025-06-18</Info>

Servers provide the fundamental building blocks for adding context to language models via
MCP. These primitives enable rich interactions between clients, servers, and language
models:

* **Prompts**: Pre-defined templates or instructions that guide language model
  interactions
* **Resources**: Structured data or content that provides additional context to the model
* **Tools**: Executable functions that allow models to perform actions or retrieve
  information

Each primitive can be summarized in the following control hierarchy:

| Primitive | Control                | Description                                        | Example                         |
| --------- | ---------------------- | -------------------------------------------------- | ------------------------------- |
| Prompts   | User-controlled        | Interactive templates invoked by user choice       | Slash commands, menu options    |
| Resources | Application-controlled | Contextual data attached and managed by the client | File contents, git history      |
| Tools     | Model-controlled       | Functions exposed to the LLM to take actions       | API POST requests, file writing |

Explore these key primitives in more detail below:

<CardGroup cols={3}>
  <Card title="Prompts" icon="message" href="/specification/2025-06-18/server/prompts" />

  <Card title="Resources" icon="file-lines" href="/specification/2025-06-18/server/resources" />

  <Card title="Tools" icon="wrench" href="/specification/2025-06-18/server/tools" />
</CardGroup>


# Prompts
Source: https://modelcontextprotocol.io/specification/2025-06-18/server/prompts



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) provides a standardized way for servers to expose prompt
templates to clients. Prompts allow servers to provide structured messages and
instructions for interacting with language models. Clients can discover available
prompts, retrieve their contents, and provide arguments to customize them.

## User Interaction Model

Prompts are designed to be **user-controlled**, meaning they are exposed from servers to
clients with the intention of the user being able to explicitly select them for use.

Typically, prompts would be triggered through user-initiated commands in the user
interface, which allows users to naturally discover and invoke available prompts.

For example, as slash commands:

<img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7f003e36d881dd6f3e5b8cbdd85e5ca5" alt="Example of prompt exposed as slash command" data-og-width="293" width="293" data-og-height="106" height="106" data-path="specification/2025-06-18/server/slash-command.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=603a7ec1db6f7630749e0b6d0558ea43 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=b9e7dae545ed3b1ffbe8dde360883993 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=8c25c68eebccb025ffe8aed6d58f19f2 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=a19b889ed688569f49a68311d5e88dfa 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=571df0a228861e612304c2ebe829b06c 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=8d315246806794b5496c4aaa2cf28e51 2500w" data-optimize="true" data-opv="2" />

However, implementors are free to expose prompts through any interface pattern that suits
their needs—the protocol itself does not mandate any specific user interaction
model.

## Capabilities

Servers that support prompts **MUST** declare the `prompts` capability during
[initialization](/specification/2025-06-18/basic/lifecycle#initialization):

```json
{
  "capabilities": {
    "prompts": {
      "listChanged": true
    }
  }
}
```

`listChanged` indicates whether the server will emit notifications when the list of
available prompts changes.

## Protocol Messages

### Listing Prompts

To retrieve available prompts, clients send a `prompts/list` request. This operation
supports [pagination](/specification/2025-06-18/server/utilities/pagination).

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "prompts/list",
  "params": {
    "cursor": "optional-cursor-value"
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "prompts": [
      {
        "name": "code_review",
        "title": "Request Code Review",
        "description": "Asks the LLM to analyze code quality and suggest improvements",
        "arguments": [
          {
            "name": "code",
            "description": "The code to review",
            "required": true
          }
        ]
      }
    ],
    "nextCursor": "next-page-cursor"
  }
}
```

### Getting a Prompt

To retrieve a specific prompt, clients send a `prompts/get` request. Arguments may be
auto-completed through [the completion API](/specification/2025-06-18/server/utilities/completion).

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "prompts/get",
  "params": {
    "name": "code_review",
    "arguments": {
      "code": "def hello():\n    print('world')"
    }
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "result": {
    "description": "Code review prompt",
    "messages": [
      {
        "role": "user",
        "content": {
          "type": "text",
          "text": "Please review this Python code:\ndef hello():\n    print('world')"
        }
      }
    ]
  }
}
```

### List Changed Notification

When the list of available prompts changes, servers that declared the `listChanged`
capability **SHOULD** send a notification:

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/prompts/list_changed"
}
```

## Message Flow

```mermaid
sequenceDiagram
    participant Client
    participant Server

    Note over Client,Server: Discovery
    Client->>Server: prompts/list
    Server-->>Client: List of prompts

    Note over Client,Server: Usage
    Client->>Server: prompts/get
    Server-->>Client: Prompt content

    opt listChanged
      Note over Client,Server: Changes
      Server--)Client: prompts/list_changed
      Client->>Server: prompts/list
      Server-->>Client: Updated prompts
    end
```

## Data Types

### Prompt

A prompt definition includes:

* `name`: Unique identifier for the prompt
* `title`: Optional human-readable name of the prompt for display purposes.
* `description`: Optional human-readable description
* `arguments`: Optional list of arguments for customization

### PromptMessage

Messages in a prompt can contain:

* `role`: Either "user" or "assistant" to indicate the speaker
* `content`: One of the following content types:

<Note>
  All content types in prompt messages support optional
  [annotations](/specification/2025-06-18/server/resources#annotations) for
  metadata about audience, priority, and modification times.
</Note>

#### Text Content

Text content represents plain text messages:

```json
{
  "type": "text",
  "text": "The text content of the message"
}
```

This is the most common content type used for natural language interactions.

#### Image Content

Image content allows including visual information in messages:

```json
{
  "type": "image",
  "data": "base64-encoded-image-data",
  "mimeType": "image/png"
}
```

The image data **MUST** be base64-encoded and include a valid MIME type. This enables
multi-modal interactions where visual context is important.

#### Audio Content

Audio content allows including audio information in messages:

```json
{
  "type": "audio",
  "data": "base64-encoded-audio-data",
  "mimeType": "audio/wav"
}
```

The audio data MUST be base64-encoded and include a valid MIME type. This enables
multi-modal interactions where audio context is important.

#### Embedded Resources

Embedded resources allow referencing server-side resources directly in messages:

```json
{
  "type": "resource",
  "resource": {
    "uri": "resource://example",
    "name": "example",
    "title": "My Example Resource",
    "mimeType": "text/plain",
    "text": "Resource content"
  }
}
```

Resources can contain either text or binary (blob) data and **MUST** include:

* A valid resource URI
* The appropriate MIME type
* Either text content or base64-encoded blob data

Embedded resources enable prompts to seamlessly incorporate server-managed content like
documentation, code samples, or other reference materials directly into the conversation
flow.

## Error Handling

Servers **SHOULD** return standard JSON-RPC errors for common failure cases:

* Invalid prompt name: `-32602` (Invalid params)
* Missing required arguments: `-32602` (Invalid params)
* Internal errors: `-32603` (Internal error)

## Implementation Considerations

1. Servers **SHOULD** validate prompt arguments before processing
2. Clients **SHOULD** handle pagination for large prompt lists
3. Both parties **SHOULD** respect capability negotiation

## Security

Implementations **MUST** carefully validate all prompt inputs and outputs to prevent
injection attacks or unauthorized access to resources.


# Resources
Source: https://modelcontextprotocol.io/specification/2025-06-18/server/resources



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) provides a standardized way for servers to expose
resources to clients. Resources allow servers to share data that provides context to
language models, such as files, database schemas, or application-specific information.
Each resource is uniquely identified by a
[URI](https://datatracker.ietf.org/doc/html/rfc3986).

## User Interaction Model

Resources in MCP are designed to be **application-driven**, with host applications
determining how to incorporate context based on their needs.

For example, applications could:

* Expose resources through UI elements for explicit selection, in a tree or list view
* Allow the user to search through and filter available resources
* Implement automatic context inclusion, based on heuristics or the AI model's selection

<img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=133fa885ef6e9c2e20049da5c33f4386" alt="Example of resource context picker" data-og-width="174" width="174" data-og-height="181" height="181" data-path="specification/2025-06-18/server/resource-picker.png" srcset="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?w=280&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=206f6dcc471323787199d7539a16b7d3 280w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?w=560&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=576d4587b4fdfe91bb14d8f77eb40e35 560w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?w=840&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c0d19d08d43fe75f27ee43fb89d5e31b 840w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?w=1100&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=463f52a7f01214ad65731626bedc4a50 1100w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?w=1650&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7478600400e55427ba7d3649ae7e8c88 1650w, https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?w=2500&fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c7ec8e376a75bf1aa5d5fcc235a74d2b 2500w" data-optimize="true" data-opv="2" />

However, implementations are free to expose resources through any interface pattern that
suits their needs—the protocol itself does not mandate any specific user
interaction model.

## Capabilities

Servers that support resources **MUST** declare the `resources` capability:

```json
{
  "capabilities": {
    "resources": {
      "subscribe": true,
      "listChanged": true
    }
  }
}
```

The capability supports two optional features:

* `subscribe`: whether the client can subscribe to be notified of changes to individual
  resources.
* `listChanged`: whether the server will emit notifications when the list of available
  resources changes.

Both `subscribe` and `listChanged` are optional—servers can support neither,
either, or both:

```json
{
  "capabilities": {
    "resources": {} // Neither feature supported
  }
}
```

```json
{
  "capabilities": {
    "resources": {
      "subscribe": true // Only subscriptions supported
    }
  }
}
```

```json
{
  "capabilities": {
    "resources": {
      "listChanged": true // Only list change notifications supported
    }
  }
}
```

## Protocol Messages

### Listing Resources

To discover available resources, clients send a `resources/list` request. This operation
supports [pagination](/specification/2025-06-18/server/utilities/pagination).

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "resources/list",
  "params": {
    "cursor": "optional-cursor-value"
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "resources": [
      {
        "uri": "file:///project/src/main.rs",
        "name": "main.rs",
        "title": "Rust Software Application Main File",
        "description": "Primary application entry point",
        "mimeType": "text/x-rust"
      }
    ],
    "nextCursor": "next-page-cursor"
  }
}
```

### Reading Resources

To retrieve resource contents, clients send a `resources/read` request:

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "resources/read",
  "params": {
    "uri": "file:///project/src/main.rs"
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "result": {
    "contents": [
      {
        "uri": "file:///project/src/main.rs",
        "name": "main.rs",
        "title": "Rust Software Application Main File",
        "mimeType": "text/x-rust",
        "text": "fn main() {\n    println!(\"Hello world!\");\n}"
      }
    ]
  }
}
```

### Resource Templates

Resource templates allow servers to expose parameterized resources using
[URI templates](https://datatracker.ietf.org/doc/html/rfc6570). Arguments may be
auto-completed through [the completion API](/specification/2025-06-18/server/utilities/completion).

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "resources/templates/list"
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 3,
  "result": {
    "resourceTemplates": [
      {
        "uriTemplate": "file:///{path}",
        "name": "Project Files",
        "title": "📁 Project Files",
        "description": "Access files in the project directory",
        "mimeType": "application/octet-stream"
      }
    ]
  }
}
```

### List Changed Notification

When the list of available resources changes, servers that declared the `listChanged`
capability **SHOULD** send a notification:

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/resources/list_changed"
}
```

### Subscriptions

The protocol supports optional subscriptions to resource changes. Clients can subscribe
to specific resources and receive notifications when they change:

**Subscribe Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 4,
  "method": "resources/subscribe",
  "params": {
    "uri": "file:///project/src/main.rs"
  }
}
```

**Update Notification:**

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/resources/updated",
  "params": {
    "uri": "file:///project/src/main.rs",
    "title": "Rust Software Application Main File"
  }
}
```

## Message Flow

```mermaid
sequenceDiagram
    participant Client
    participant Server

    Note over Client,Server: Resource Discovery
    Client->>Server: resources/list
    Server-->>Client: List of resources

    Note over Client,Server: Resource Access
    Client->>Server: resources/read
    Server-->>Client: Resource contents

    Note over Client,Server: Subscriptions
    Client->>Server: resources/subscribe
    Server-->>Client: Subscription confirmed

    Note over Client,Server: Updates
    Server--)Client: notifications/resources/updated
    Client->>Server: resources/read
    Server-->>Client: Updated contents
```

## Data Types

### Resource

A resource definition includes:

* `uri`: Unique identifier for the resource
* `name`: The name of the resource.
* `title`: Optional human-readable name of the resource for display purposes.
* `description`: Optional description
* `mimeType`: Optional MIME type
* `size`: Optional size in bytes

### Resource Contents

Resources can contain either text or binary data:

#### Text Content

```json
{
  "uri": "file:///example.txt",
  "name": "example.txt",
  "title": "Example Text File",
  "mimeType": "text/plain",
  "text": "Resource content"
}
```

#### Binary Content

```json
{
  "uri": "file:///example.png",
  "name": "example.png",
  "title": "Example Image",
  "mimeType": "image/png",
  "blob": "base64-encoded-data"
}
```

### Annotations

Resources, resource templates and content blocks support optional annotations that provide hints to clients about how to use or display the resource:

* **`audience`**: An array indicating the intended audience(s) for this resource. Valid values are `"user"` and `"assistant"`. For example, `["user", "assistant"]` indicates content useful for both.
* **`priority`**: A number from 0.0 to 1.0 indicating the importance of this resource. A value of 1 means "most important" (effectively required), while 0 means "least important" (entirely optional).
* **`lastModified`**: An ISO 8601 formatted timestamp indicating when the resource was last modified (e.g., `"2025-01-12T15:00:58Z"`).

Example resource with annotations:

```json
{
  "uri": "file:///project/README.md",
  "name": "README.md",
  "title": "Project Documentation",
  "mimeType": "text/markdown",
  "annotations": {
    "audience": ["user"],
    "priority": 0.8,
    "lastModified": "2025-01-12T15:00:58Z"
  }
}
```

Clients can use these annotations to:

* Filter resources based on their intended audience
* Prioritize which resources to include in context
* Display modification times or sort by recency

## Common URI Schemes

The protocol defines several standard URI schemes. This list not
exhaustive—implementations are always free to use additional, custom URI schemes.

### https\://

Used to represent a resource available on the web.

Servers **SHOULD** use this scheme only when the client is able to fetch and load the
resource directly from the web on its own—that is, it doesn’t need to read the resource
via the MCP server.

For other use cases, servers **SHOULD** prefer to use another URI scheme, or define a
custom one, even if the server will itself be downloading resource contents over the
internet.

### file://

Used to identify resources that behave like a filesystem. However, the resources do not
need to map to an actual physical filesystem.

MCP servers **MAY** identify file:// resources with an
[XDG MIME type](https://specifications.freedesktop.org/shared-mime-info-spec/0.14/ar01s02.html#id-1.3.14),
like `inode/directory`, to represent non-regular files (such as directories) that don’t
otherwise have a standard MIME type.

### git://

Git version control integration.

### Custom URI Schemes

Custom URI schemes **MUST** be in accordance with [RFC3986](https://datatracker.ietf.org/doc/html/rfc3986),
taking the above guidance in to account.

## Error Handling

Servers **SHOULD** return standard JSON-RPC errors for common failure cases:

* Resource not found: `-32002`
* Internal errors: `-32603`

Example error:

```json
{
  "jsonrpc": "2.0",
  "id": 5,
  "error": {
    "code": -32002,
    "message": "Resource not found",
    "data": {
      "uri": "file:///nonexistent.txt"
    }
  }
}
```

## Security Considerations

1. Servers **MUST** validate all resource URIs
2. Access controls **SHOULD** be implemented for sensitive resources
3. Binary data **MUST** be properly encoded
4. Resource permissions **SHOULD** be checked before operations


# Tools
Source: https://modelcontextprotocol.io/specification/2025-06-18/server/tools



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) allows servers to expose tools that can be invoked by
language models. Tools enable models to interact with external systems, such as querying
databases, calling APIs, or performing computations. Each tool is uniquely identified by
a name and includes metadata describing its schema.

## User Interaction Model

Tools in MCP are designed to be **model-controlled**, meaning that the language model can
discover and invoke tools automatically based on its contextual understanding and the
user's prompts.

However, implementations are free to expose tools through any interface pattern that
suits their needs—the protocol itself does not mandate any specific user
interaction model.

<Warning>
  For trust & safety and security, there **SHOULD** always
  be a human in the loop with the ability to deny tool invocations.

  Applications **SHOULD**:

  * Provide UI that makes clear which tools are being exposed to the AI model
  * Insert clear visual indicators when tools are invoked
  * Present confirmation prompts to the user for operations, to ensure a human is in the
    loop
</Warning>

## Capabilities

Servers that support tools **MUST** declare the `tools` capability:

```json
{
  "capabilities": {
    "tools": {
      "listChanged": true
    }
  }
}
```

`listChanged` indicates whether the server will emit notifications when the list of
available tools changes.

## Protocol Messages

### Listing Tools

To discover available tools, clients send a `tools/list` request. This operation supports
[pagination](/specification/2025-06-18/server/utilities/pagination).

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list",
  "params": {
    "cursor": "optional-cursor-value"
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "tools": [
      {
        "name": "get_weather",
        "title": "Weather Information Provider",
        "description": "Get current weather information for a location",
        "inputSchema": {
          "type": "object",
          "properties": {
            "location": {
              "type": "string",
              "description": "City name or zip code"
            }
          },
          "required": ["location"]
        }
      }
    ],
    "nextCursor": "next-page-cursor"
  }
}
```

### Calling Tools

To invoke a tool, clients send a `tools/call` request:

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "get_weather",
    "arguments": {
      "location": "New York"
    }
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 2,
  "result": {
    "content": [
      {
        "type": "text",
        "text": "Current weather in New York:\nTemperature: 72°F\nConditions: Partly cloudy"
      }
    ],
    "isError": false
  }
}
```

### List Changed Notification

When the list of available tools changes, servers that declared the `listChanged`
capability **SHOULD** send a notification:

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/tools/list_changed"
}
```

## Message Flow

```mermaid
sequenceDiagram
    participant LLM
    participant Client
    participant Server

    Note over Client,Server: Discovery
    Client->>Server: tools/list
    Server-->>Client: List of tools

    Note over Client,LLM: Tool Selection
    LLM->>Client: Select tool to use

    Note over Client,Server: Invocation
    Client->>Server: tools/call
    Server-->>Client: Tool result
    Client->>LLM: Process result

    Note over Client,Server: Updates
    Server--)Client: tools/list_changed
    Client->>Server: tools/list
    Server-->>Client: Updated tools
```

## Data Types

### Tool

A tool definition includes:

* `name`: Unique identifier for the tool
* `title`: Optional human-readable name of the tool for display purposes.
* `description`: Human-readable description of functionality
* `inputSchema`: JSON Schema defining expected parameters
* `outputSchema`: Optional JSON Schema defining expected output structure
* `annotations`: optional properties describing tool behavior

<Warning>
  For trust & safety and security, clients **MUST** consider
  tool annotations to be untrusted unless they come from trusted servers.
</Warning>

### Tool Result

Tool results may contain [**structured**](#structured-content) or **unstructured** content.

**Unstructured** content is returned in the `content` field of a result, and can contain multiple content items of different types:

<Note>
  All content types (text, image, audio, resource links, and embedded resources)
  support optional
  [annotations](/specification/2025-06-18/server/resources#annotations) that
  provide metadata about audience, priority, and modification times. This is the
  same annotation format used by resources and prompts.
</Note>

#### Text Content

```json
{
  "type": "text",
  "text": "Tool result text"
}
```

#### Image Content

```json
{
  "type": "image",
  "data": "base64-encoded-data",
  "mimeType": "image/png"
  "annotations": {
    "audience": ["user"],
    "priority": 0.9
  }

}
```

This example demonstrates the use of an optional Annotation.

#### Audio Content

```json
{
  "type": "audio",
  "data": "base64-encoded-audio-data",
  "mimeType": "audio/wav"
}
```

#### Resource Links

A tool **MAY** return links to [Resources](/specification/2025-06-18/server/resources), to provide additional context
or data. In this case, the tool will return a URI that can be subscribed to or fetched by the client:

```json
{
  "type": "resource_link",
  "uri": "file:///project/src/main.rs",
  "name": "main.rs",
  "description": "Primary application entry point",
  "mimeType": "text/x-rust",
  "annotations": {
    "audience": ["assistant"],
    "priority": 0.9
  }
}
```

Resource links support the same [Resource annotations](/specification/2025-06-18/server/resources#annotations) as regular resources to help clients understand how to use them.

<Info>
  Resource links returned by tools are not guaranteed to appear in the results
  of a `resources/list` request.
</Info>

#### Embedded Resources

[Resources](/specification/2025-06-18/server/resources) **MAY** be embedded to provide additional context
or data using a suitable [URI scheme](./resources#common-uri-schemes). Servers that use embedded resources **SHOULD** implement the `resources` capability:

```json
{
  "type": "resource",
  "resource": {
    "uri": "file:///project/src/main.rs",
    "title": "Project Rust Main File",
    "mimeType": "text/x-rust",
    "text": "fn main() {\n    println!(\"Hello world!\");\n}",
    "annotations": {
      "audience": ["user", "assistant"],
      "priority": 0.7,
      "lastModified": "2025-05-03T14:30:00Z"
    }
  }
}
```

Embedded resources support the same [Resource annotations](/specification/2025-06-18/server/resources#annotations) as regular resources to help clients understand how to use them.

#### Structured Content

**Structured** content is returned as a JSON object in the `structuredContent` field of a result.

For backwards compatibility, a tool that returns structured content SHOULD also return the serialized JSON in a TextContent block.

#### Output Schema

Tools may also provide an output schema for validation of structured results.
If an output schema is provided:

* Servers **MUST** provide structured results that conform to this schema.
* Clients **SHOULD** validate structured results against this schema.

Example tool with output schema:

```json
{
  "name": "get_weather_data",
  "title": "Weather Data Retriever",
  "description": "Get current weather data for a location",
  "inputSchema": {
    "type": "object",
    "properties": {
      "location": {
        "type": "string",
        "description": "City name or zip code"
      }
    },
    "required": ["location"]
  },
  "outputSchema": {
    "type": "object",
    "properties": {
      "temperature": {
        "type": "number",
        "description": "Temperature in celsius"
      },
      "conditions": {
        "type": "string",
        "description": "Weather conditions description"
      },
      "humidity": {
        "type": "number",
        "description": "Humidity percentage"
      }
    },
    "required": ["temperature", "conditions", "humidity"]
  }
}
```

Example valid response for this tool:

```json
{
  "jsonrpc": "2.0",
  "id": 5,
  "result": {
    "content": [
      {
        "type": "text",
        "text": "{\"temperature\": 22.5, \"conditions\": \"Partly cloudy\", \"humidity\": 65}"
      }
    ],
    "structuredContent": {
      "temperature": 22.5,
      "conditions": "Partly cloudy",
      "humidity": 65
    }
  }
}
```

Providing an output schema helps clients and LLMs understand and properly handle structured tool outputs by:

* Enabling strict schema validation of responses
* Providing type information for better integration with programming languages
* Guiding clients and LLMs to properly parse and utilize the returned data
* Supporting better documentation and developer experience

## Error Handling

Tools use two error reporting mechanisms:

1. **Protocol Errors**: Standard JSON-RPC errors for issues like:
   * Unknown tools
   * Invalid arguments
   * Server errors

2. **Tool Execution Errors**: Reported in tool results with `isError: true`:
   * API failures
   * Invalid input data
   * Business logic errors

Example protocol error:

```json
{
  "jsonrpc": "2.0",
  "id": 3,
  "error": {
    "code": -32602,
    "message": "Unknown tool: invalid_tool_name"
  }
}
```

Example tool execution error:

```json
{
  "jsonrpc": "2.0",
  "id": 4,
  "result": {
    "content": [
      {
        "type": "text",
        "text": "Failed to fetch weather data: API rate limit exceeded"
      }
    ],
    "isError": true
  }
}
```

## Security Considerations

1. Servers **MUST**:
   * Validate all tool inputs
   * Implement proper access controls
   * Rate limit tool invocations
   * Sanitize tool outputs

2. Clients **SHOULD**:
   * Prompt for user confirmation on sensitive operations
   * Show tool inputs to the user before calling the server, to avoid malicious or
     accidental data exfiltration
   * Validate tool results before passing to LLM
   * Implement timeouts for tool calls
   * Log tool usage for audit purposes


# Completion
Source: https://modelcontextprotocol.io/specification/2025-06-18/server/utilities/completion



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) provides a standardized way for servers to offer
argument autocompletion suggestions for prompts and resource URIs. This enables rich,
IDE-like experiences where users receive contextual suggestions while entering argument
values.

## User Interaction Model

Completion in MCP is designed to support interactive user experiences similar to IDE code
completion.

For example, applications may show completion suggestions in a dropdown or popup menu as
users type, with the ability to filter and select from available options.

However, implementations are free to expose completion through any interface pattern that
suits their needs—the protocol itself does not mandate any specific user
interaction model.

## Capabilities

Servers that support completions **MUST** declare the `completions` capability:

```json
{
  "capabilities": {
    "completions": {}
  }
}
```

## Protocol Messages

### Requesting Completions

To get completion suggestions, clients send a `completion/complete` request specifying
what is being completed through a reference type:

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "completion/complete",
  "params": {
    "ref": {
      "type": "ref/prompt",
      "name": "code_review"
    },
    "argument": {
      "name": "language",
      "value": "py"
    }
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "completion": {
      "values": ["python", "pytorch", "pyside"],
      "total": 10,
      "hasMore": true
    }
  }
}
```

For prompts or URI templates with multiple arguments, clients should include previous completions in the `context.arguments` object to provide context for subsequent requests.

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "completion/complete",
  "params": {
    "ref": {
      "type": "ref/prompt",
      "name": "code_review"
    },
    "argument": {
      "name": "framework",
      "value": "fla"
    },
    "context": {
      "arguments": {
        "language": "python"
      }
    }
  }
}
```

**Response:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "completion": {
      "values": ["flask"],
      "total": 1,
      "hasMore": false
    }
  }
}
```

### Reference Types

The protocol supports two types of completion references:

| Type           | Description                 | Example                                             |
| -------------- | --------------------------- | --------------------------------------------------- |
| `ref/prompt`   | References a prompt by name | `{"type": "ref/prompt", "name": "code_review"}`     |
| `ref/resource` | References a resource URI   | `{"type": "ref/resource", "uri": "file:///{path}"}` |

### Completion Results

Servers return an array of completion values ranked by relevance, with:

* Maximum 100 items per response
* Optional total number of available matches
* Boolean indicating if additional results exist

## Message Flow

```mermaid
sequenceDiagram
    participant Client
    participant Server

    Note over Client: User types argument
    Client->>Server: completion/complete
    Server-->>Client: Completion suggestions

    Note over Client: User continues typing
    Client->>Server: completion/complete
    Server-->>Client: Refined suggestions
```

## Data Types

### CompleteRequest

* `ref`: A `PromptReference` or `ResourceReference`
* `argument`: Object containing:
  * `name`: Argument name
  * `value`: Current value
* `context`: Object containing:
  * `arguments`: A mapping of already-resolved argument names to their values.

### CompleteResult

* `completion`: Object containing:
  * `values`: Array of suggestions (max 100)
  * `total`: Optional total matches
  * `hasMore`: Additional results flag

## Error Handling

Servers **SHOULD** return standard JSON-RPC errors for common failure cases:

* Method not found: `-32601` (Capability not supported)
* Invalid prompt name: `-32602` (Invalid params)
* Missing required arguments: `-32602` (Invalid params)
* Internal errors: `-32603` (Internal error)

## Implementation Considerations

1. Servers **SHOULD**:
   * Return suggestions sorted by relevance
   * Implement fuzzy matching where appropriate
   * Rate limit completion requests
   * Validate all inputs

2. Clients **SHOULD**:
   * Debounce rapid completion requests
   * Cache completion results where appropriate
   * Handle missing or partial results gracefully

## Security

Implementations **MUST**:

* Validate all completion inputs
* Implement appropriate rate limiting
* Control access to sensitive suggestions
* Prevent completion-based information disclosure


# Logging
Source: https://modelcontextprotocol.io/specification/2025-06-18/server/utilities/logging



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) provides a standardized way for servers to send
structured log messages to clients. Clients can control logging verbosity by setting
minimum log levels, with servers sending notifications containing severity levels,
optional logger names, and arbitrary JSON-serializable data.

## User Interaction Model

Implementations are free to expose logging through any interface pattern that suits their
needs—the protocol itself does not mandate any specific user interaction model.

## Capabilities

Servers that emit log message notifications **MUST** declare the `logging` capability:

```json
{
  "capabilities": {
    "logging": {}
  }
}
```

## Log Levels

The protocol follows the standard syslog severity levels specified in
[RFC 5424](https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1):

| Level     | Description                      | Example Use Case           |
| --------- | -------------------------------- | -------------------------- |
| debug     | Detailed debugging information   | Function entry/exit points |
| info      | General informational messages   | Operation progress updates |
| notice    | Normal but significant events    | Configuration changes      |
| warning   | Warning conditions               | Deprecated feature usage   |
| error     | Error conditions                 | Operation failures         |
| critical  | Critical conditions              | System component failures  |
| alert     | Action must be taken immediately | Data corruption detected   |
| emergency | System is unusable               | Complete system failure    |

## Protocol Messages

### Setting Log Level

To configure the minimum log level, clients **MAY** send a `logging/setLevel` request:

**Request:**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "logging/setLevel",
  "params": {
    "level": "info"
  }
}
```

### Log Message Notifications

Servers send log messages using `notifications/message` notifications:

```json
{
  "jsonrpc": "2.0",
  "method": "notifications/message",
  "params": {
    "level": "error",
    "logger": "database",
    "data": {
      "error": "Connection failed",
      "details": {
        "host": "localhost",
        "port": 5432
      }
    }
  }
}
```

## Message Flow

```mermaid
sequenceDiagram
    participant Client
    participant Server

    Note over Client,Server: Configure Logging
    Client->>Server: logging/setLevel (info)
    Server-->>Client: Empty Result

    Note over Client,Server: Server Activity
    Server--)Client: notifications/message (info)
    Server--)Client: notifications/message (warning)
    Server--)Client: notifications/message (error)

    Note over Client,Server: Level Change
    Client->>Server: logging/setLevel (error)
    Server-->>Client: Empty Result
    Note over Server: Only sends error level<br/>and above
```

## Error Handling

Servers **SHOULD** return standard JSON-RPC errors for common failure cases:

* Invalid log level: `-32602` (Invalid params)
* Configuration errors: `-32603` (Internal error)

## Implementation Considerations

1. Servers **SHOULD**:
   * Rate limit log messages
   * Include relevant context in data field
   * Use consistent logger names
   * Remove sensitive information

2. Clients **MAY**:
   * Present log messages in the UI
   * Implement log filtering/search
   * Display severity visually
   * Persist log messages

## Security

1. Log messages **MUST NOT** contain:
   * Credentials or secrets
   * Personal identifying information
   * Internal system details that could aid attacks

2. Implementations **SHOULD**:
   * Rate limit messages
   * Validate all data fields
   * Control log access
   * Monitor for sensitive content


# Pagination
Source: https://modelcontextprotocol.io/specification/2025-06-18/server/utilities/pagination



<div id="enable-section-numbers" />

<Info>**Protocol Revision**: 2025-06-18</Info>

The Model Context Protocol (MCP) supports paginating list operations that may return
large result sets. Pagination allows servers to yield results in smaller chunks rather
than all at once.

Pagination is especially important when connecting to external services over the
internet, but also useful for local integrations to avoid performance issues with large
data sets.

## Pagination Model

Pagination in MCP uses an opaque cursor-based approach, instead of numbered pages.

* The **cursor** is an opaque string token, representing a position in the result set
* **Page size** is determined by the server, and clients **MUST NOT** assume a fixed page
  size

## Response Format

Pagination starts when the server sends a **response** that includes:

* The current page of results
* An optional `nextCursor` field if more results exist

```json
{
  "jsonrpc": "2.0",
  "id": "123",
  "result": {
    "resources": [...],
    "nextCursor": "eyJwYWdlIjogM30="
  }
}
```

## Request Format

After receiving a cursor, the client can *continue* paginating by issuing a request
including that cursor:

```json
{
  "jsonrpc": "2.0",
  "id": "124",
  "method": "resources/list",
  "params": {
    "cursor": "eyJwYWdlIjogMn0="
  }
}
```

## Pagination Flow

```mermaid
sequenceDiagram
    participant Client
    participant Server

    Client->>Server: List Request (no cursor)
    loop Pagination Loop
      Server-->>Client: Page of results + nextCursor
      Client->>Server: List Request (with cursor)
    end
```

## Operations Supporting Pagination

The following MCP operations support pagination:

* `resources/list` - List available resources
* `resources/templates/list` - List resource templates
* `prompts/list` - List available prompts
* `tools/list` - List available tools

## Implementation Guidelines

1. Servers **SHOULD**:
   * Provide stable cursors
   * Handle invalid cursors gracefully

2. Clients **SHOULD**:
   * Treat a missing `nextCursor` as the end of results
   * Support both paginated and non-paginated flows

3. Clients **MUST** treat cursors as opaque tokens:
   * Don't make assumptions about cursor format
   * Don't attempt to parse or modify cursors
   * Don't persist cursors across sessions

## Error Handling

Invalid cursors **SHOULD** result in an error with code -32602 (Invalid params).


# Versioning
Source: https://modelcontextprotocol.io/specification/versioning



The Model Context Protocol uses string-based version identifiers following the format
`YYYY-MM-DD`, to indicate the last date backwards incompatible changes were made.

<Info>
  The protocol version will *not* be incremented when the
  protocol is updated, as long as the changes maintain backwards compatibility. This allows
  for incremental improvements while preserving interoperability.
</Info>

## Revisions

Revisions may be marked as:

* **Draft**: in-progress specifications, not yet ready for consumption.
* **Current**: the current protocol version, which is ready for use and may continue to
  receive backwards compatible changes.
* **Final**: past, complete specifications that will not be changed.

The **current** protocol version is [**2025-06-18**](/specification/2025-06-18/).

## Negotiation

Version negotiation happens during
[initialization](/specification/2025-06-18/basic/lifecycle#initialization). Clients and
servers **MAY** support multiple protocol versions simultaneously, but they **MUST**
agree on a single version to use for the session.

The protocol provides appropriate error handling if version negotiation fails, allowing
clients to gracefully terminate connections when they cannot find a version compatible
with the server.


