Slack Search MCP Server

A Model Context Protocol (MCP) server that provides tools and resources to access Slack’s search functionality. This server allows LLMs to search and retrieve users, channels, messages, and more from a Slack workspace.

Features

Tools

1. get_users - Get a list of users in the Slack workspace
2. get_channels - Get a list of channels in the Slack workspace
3. get_channel_messages - Get messages from a specific channel
4. get_thread_replies - Get replies in a thread
5. search_messages - Search for messages in Slack

Resources

1. allusers:// - Get all users in the Slack workspace
2. allchannels:// - Get all channels in the Slack workspace

Requirements

• Bun runtime
• Slack API token with appropriate permissions

Installation

1. Clone the repository
2. Install dependencies:

   bun install
   

Usage

1. Set the Slack API token as an environment variable:

   export SLACK_TOKEN=xoxb-your-token-here
   

2. Run the server:

   bun run index.ts
   

   Or use the compiled version:

   ./dist/slack_search_function_mcp
   

Building

To build the executable:

bun run build

This will create a compiled executable in the dist directory.

MCP Configuration

To use this server with an MCP-enabled LLM, add it to your MCP configuration:

{
  "mcpServers": {
    "slack": {
      "command": "/path/to/dist/slack_search_function_mcp",
      "env": {
        "SLACK_TOKEN": "xoxb-your-token-here"
      }
    }
  }
}

Tool Examples

Get Users

{
  "name": "get_users",
  "arguments": {
    "limit": 10
  }
}

Get Channels

{
  "name": "get_channels",
  "arguments": {
    "limit": 10,
    "exclude_archived": true
  }
}

Get Channel Messages

{
  "name": "get_channel_messages",
  "arguments": {
    "channel": "C01234ABCDE",
    "limit": 10
  }
}

Get Thread Replies

{
  "name": "get_thread_replies",
  "arguments": {
    "channel": "C01234ABCDE",
    "thread_ts": "1234567890.123456",
    "limit": 10
  }
}

Search Messages

{
  "name": "search_messages",
  "arguments": {
    "query": "important announcement",
    "sort": "timestamp",
    "sort_dir": "desc",
    "count": 10
  }
}

Resource Examples

Get All Users

allusers://

Get All Channels

allchannels://

Error Handling

The server includes comprehensive error handling for:

• Invalid or missing Slack API token
• API rate limits
• Network errors
• Invalid parameters
• Authentication failures

Security

• The Slack API token is never logged or exposed in responses
• The token is securely passed via environment variables