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

3. 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