slack-mcp-server

A Model Context Protocol (MCP) server for Slack workspaces, enabling advanced channel and messaging management without requiring Slack admin permissions or bot creation.

Source: GitHub Repository

Features

• Transports: Supports both Stdio and Server-Sent Events (SSE) transports for flexible integration.
• Proxy Support: Can be configured to use a proxy for outbound connections.
• No Slack Workspace Permission Requirements: Works without needing to create bots or request admin approval in Slack workspaces.
• Channel and Messaging Management:
  • conversations_history: Retrieve messages from channels using channel ID, with cursor-based pagination and message limits.
  • channels_list: List channels with filtering by type (mpim, im, public_channel, private_channel) and sorting by popularity.
• Installation Options:
  • Can be run via npx (Node.js), Docker, or docker-compose.
• Configurable via Environment Variables and Arguments:
  • Transport selection (--transport): stdio or sse
  • Authentication tokens (SLACK_MCP_XOXC_TOKEN and SLACK_MCP_XOXD_TOKEN)
  • Server port and host configuration
  • Proxy URL and custom CA certificates
  • SSE API Key for authorization
  • Option to trust all SSL certificates (for insecure setups)
• Inspector/Debugging Tools: Integration with @modelcontextprotocol/inspector for debugging with stdio transport, and log viewing.
• TLS/HTTPS Support: Guidance for exposing the server securely over the internet, including ngrok usage.
• Open Source: Licensed under MIT.

Setup & Usage

• Requires extraction of Slack authentication tokens (xoxc- and xoxd-) from the browser session.
• Can be integrated with Claude Desktop and other MCP-compatible tools.
• Detailed Docker and docker-compose setup instructions available in the repository.

Pricing

• Free and open source (MIT License). No paid plans.

Tags

mcp slack messaging channel-management