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

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

Resources

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

Requirements

Bun runtime
Slack API token with appropriate permissions

Installation

Clone the repository
Install dependencies:
bun install

Usage

Set the Slack API token as an environment variable:
export SLACK_TOKEN=xoxb-your-token-here
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

This server cannot be installed

security - not tested

license - not found

quality - not tested

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

An MCP server that enables LLMs to access Slack's search functionality to retrieve users, channels, messages, and thread replies from a Slack workspace.

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