slack-mcp-server

Why we included this project

Slack holds most of a team's day-to-day communication, and this MCP server gives an LLM-driven assistant a clean way to reach into it. Through the Model Context Protocol, an agent can read channels and threads, search message history, and fetch unread messages across DMs and group DMs, with @mention filtering and mark-as-read support. Posting is deliberately gated: the add-message tool ships disabled and turns on only via an environment variable. Transport and auth options cover the realistic setups, with stdio, SSE, and HTTP connections, proxy support, and a choice between OAuth tokens and a stealth mode that needs no bot installation or extra scopes. Smart history pagination by date window or message count keeps token usage bounded, and resolving channels by name like #general beats juggling IDs. If you already run any MCP-compatible assistant and want it inside Slack without standing up a bot app, this fits.