# Slack MCP Server

A Model Context Protocol (MCP) server for interacting with Slack.

## Features

- List channels
- Post messages
- Reply to threads
- Add reactions
- Get channel history
- Get thread replies
- Get users
- Get user profiles

## Logging

The server uses Winston for structured logging. The logger provides the following log levels:

- `error`: For errors and exceptions
- `warn`: For warning messages
- `info`: For general information
- `debug`: For detailed debugging information

Logs are formatted with timestamps and include additional metadata when available.

Example log output:
```
2023-11-15 10:30:45 [info]: Starting Slack MCP Server...
2023-11-15 10:30:45 [info]: Server listening on port 3000
2023-11-15 10:30:46 [debug]: Received CallToolRequest {"request":{"params":{"name":"slack_list_channels"}}}
```

## Environment Variables

- `SLACK_BOT_TOKEN`: Your Slack bot token
- `SLACK_TEAM_ID`: Your Slack team ID
- `PORT`: Port to listen on (default: 3000)
- `TRANSPORT`: Transport type ("SSE" or "stdio")

## Installation

```bash
npm install
```

## Usage

```bash
npm start
```

## Development

```bash
npm run watch
```

## Tools

1. `slack_list_channels`
   - List public channels in the workspace
   - Optional inputs:
     - `limit` (number, default: 100, max: 200): Maximum number of channels to return
     - `cursor` (string): Pagination cursor for next page
   - Returns: List of channels with their IDs and information

2. `slack_post_message`
   - Post a new message to a Slack channel
   - Required inputs:
     - `slack_channel_id` (string): The ID of the channel to post to
     - `text` (string): The message text to post
   - Returns: Message posting confirmation and timestamp

3. `slack_reply_to_thread`
   - Reply to a specific message thread
   - Required inputs:
     - `slack_channel_id` (string): The channel containing the thread
     - `thread_ts` (string): Timestamp of the parent message
     - `text` (string): The reply text
   - Returns: Reply confirmation and timestamp

4. `slack_add_reaction`
   - Add an emoji reaction to a message
   - Required inputs:
     - `slack_channel_id` (string): The channel containing the message
     - `timestamp` (string): Message timestamp to react to
     - `reaction` (string): Emoji name without colons
   - Returns: Reaction confirmation

5. `slack_get_channel_history`
   - Get recent messages from a channel
   - Required inputs:
     - `slack_channel_id` (string): The channel ID
   - Optional inputs:
     - `limit` (number, default: 10): Number of messages to retrieve
   - Returns: List of messages with their content and metadata

6. `slack_get_thread_replies`
   - Get all replies in a message thread
   - Required inputs:
     - `slack_channel_id` (string): The channel containing the thread
     - `thread_ts` (string): Timestamp of the parent message
   - Returns: List of replies with their content and metadata

7. `slack_get_users`
   - Get list of workspace users with basic profile information
   - Optional inputs:
     - `cursor` (string): Pagination cursor for next page
     - `limit` (number, default: 100, max: 200): Maximum users to return
   - Returns: List of users with their basic profiles

8. `slack_get_user_profile`
   - Get detailed profile information for a specific user
   - Required inputs:
     - `user_id` (string): The user's ID
   - Returns: Detailed user profile information

## Setup

1. Create a Slack App:
   - Visit the [Slack Apps page](https://api.slack.com/apps)
   - Click "Create New App"
   - Choose "From scratch"
   - Name your app and select your workspace

2. Configure Bot Token Scopes:
   Navigate to "OAuth & Permissions" and add these scopes:
   - `channels:history` - View messages and other content in public channels
   - `channels:read` - View basic channel information
   - `chat:write` - Send messages as the app
   - `reactions:write` - Add emoji reactions to messages
   - `users:read` - View users and their basic information

4. Install App to Workspace:
   - Click "Install to Workspace" and authorize the app
   - Save the "Bot User OAuth Token" that starts with `xoxb-`

5. Get your Team ID (starts with a `T`) by following [this guidance](https://slack.com/help/articles/221769328-Locate-your-Slack-URL-or-ID#find-your-workspace-or-org-id)

### Usage with Claude Desktop

Add the following to your `claude_desktop_config.json`:

#### npx

```json
{
  "mcpServers": {
    "slack": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-slack"
      ],
      "env": {
        "SLACK_BOT_TOKEN": "xoxb-your-bot-token",
        "SLACK_TEAM_ID": "T01234567"
      }
    }
  }
}
```

#### docker

```json
{
  "mcpServers": {
    "slack": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "SLACK_BOT_TOKEN",
        "-e",
        "SLACK_TEAM_ID",
        "mcp/slack"
      ],
      "env": {
        "SLACK_BOT_TOKEN": "xoxb-your-bot-token",
        "SLACK_TEAM_ID": "T01234567"
      }
    }
  }
}
```

### Troubleshooting

If you encounter permission errors, verify that:
1. All required scopes are added to your Slack app
2. The app is properly installed to your workspace
3. The tokens and workspace ID are correctly copied to your configuration
4. The app has been added to the channels it needs to access

## License

This MCP server is licensed under the MIT License. This means you are free to use, modify, and distribute the software, subject to the terms and conditions of the MIT License. For more details, please see the LICENSE file in the project repository.
