Slack MCP Server

Slack MCP Server

This MCP server provides integration with the Slack API via HTTP transport, allowing for channel management and message operations. It enables users to list channels, send or edit messages, search message history, and retrieve user information through standardized tools.

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README

Slack MCP Server

MCP server for Slack API integration with HTTP transport.

Setup

  1. Get a Slack token (Bot Token xoxb-... or User Token xoxp-...)

  2. Configure environment:

export SLACK_TOKEN=xoxb-your-token
  1. Run:
npm install
npm run start:http

Docker

docker build -t slack-mcp .
docker run -d -p 3929:3929 -e SLACK_TOKEN=xoxb-... slack-mcp

Endpoints

  • GET /health - Health check
  • GET /tools - List available tools
  • POST /call - Call a tool

Available Tools

Tool Description
slack_list_channels List channels
slack_get_channel_history Get channel messages
slack_post_message Send a message
slack_update_message Edit a message
slack_delete_message Delete a message
slack_add_reaction Add emoji reaction
slack_get_user_info Get user details
slack_list_users List workspace users
slack_search_messages Search messages

Example

# List channels
curl -X POST http://localhost:3929/call \
  -H "Content-Type: application/json" \
  -d '{"name": "slack_list_channels", "arguments": {}}'

# Post message
curl -X POST http://localhost:3929/call \
  -H "Content-Type: application/json" \
  -d '{"name": "slack_post_message", "arguments": {"channel": "C123", "text": "Hello!"}}'

Token Scopes Required

For Bot Token (xoxb-...):

  • channels:read, channels:history
  • chat:write
  • users:read
  • reactions:write
  • search:read (for search)

For User Token (xoxp-...):

  • Same as above, plus any additional scopes for your use case

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