# Initial Concept

Provide a type-safe, fluent builder API for Google's Agent Development Kit (ADK) to simplify agent and pipeline creation.

# Product Definition

## Vision

To provide the most ergonomic, type-safe, and robust developer experience for building complex AI agent systems using Google's Agent Development Kit (ADK). By reducing boilerplate and enforcing compile-time correctness, \`adk-fluent\` empowers developers to focus on agent logic and system topology rather than manual configuration.

## Target Audience

- AI Engineers and Software Developers building multi-agent systems on Google Vertex AI.
- Teams seeking to maintain high-quality, readable agent definitions that scale with the evolving ADK ecosystem.
- Developers who value IDE support (autocomplete, type checking) and rigorous data-flow validation.

## Core Features

- **Fluent Builder API:** Chainable methods for configuring Agents, Workflows, Tools, and Plugins.
- **Expression Algebra:** Intuitive operators (\`>>\`, \`|\`, \`\*\`, \`@\`, \`//\`) for composing complex execution DAGs.
- **Context Engineering (C Module):** Declarative control over conversation history and prompt assembly to prevent duplication and token bloat.
- **State Transforms (S Module):** Zero-cost functional nodes for reshaping session state between execution steps.
- **Automatic Codegen Pipeline:** Keeps the library in 100% sync with ADK upstream by introspecting Pydantic schemas.
- **Unified Contract Checker:** Validates data flow across state, context, and instruction channels at build time.
- **Rich Introspection:** Debug-ready Mermaid diagram generation and human-readable execution plan explanations.

## Design Goals

- **Maintainability:** Minimal manual effort to track ADK updates through the scanner/seed/generator pipeline.
- **Type Safety:** 100% strict type checking and full IDE autocomplete support.
- **Zero Surprises:** Builders produce identical native ADK objects, ensuring full compatibility with existing ADK tools.
- **Compositionality:** Agents and sub-pipelines are first-class, immutable building blocks.
