Slack MCP: Documentation

Connection

Repo: github.com/korotovsky/slack-mcp-server (1.8k★). Install: npx -y slack-mcp-server@latest (stdio) or the Docker image; an SSE/HTTP mode is also supported for team deployments. Auth — two options: workspace browser tokens SLACK_MCP_XOXC_TOKEN + SLACK_MCP_XOXD_TOKEN (no Slack app install, uses your own user rights) or a classic bot token SLACK_BOT_TOKEN (xoxb) for an installed app.

Tools

18 tools: history and search (conversations_history, conversations_replies, search_messages), posting (chat_postMessage, thread replies), reactions (reactions_add), channels and user groups (conversations_list, usergroups_list), direct messages (conversations_open for DMs).

Agent flow

"Find today's messages about the deploy in #incidents", "post an update to #general and confirm with a reaction", "show who from the @oncall user group is active in the channel".

Note

A community project (not the official Slack MCP — that reference server is archived). Over 9,000 active users and 1.8k GitHub stars, but no SLA from Slack. xoxc/xoxd are browser session tokens — store them as secrets.