channelchat

channelchat gives an MCP client a working presence in a Slack workspace: list the channels, post a message, carry on a thread, drop a reaction, and look back over history or up at the member list. It implements the full documented server-slack tool set — all eight tools — against the Slack Web API.

Two environment variables are required, exactly as in the original server: SLACK_BOT_TOKEN (the bot user OAuth token, sent as a Bearer token) and SLACK_TEAM_ID (the workspace id, passed to the methods that accept one). If either is missing, every call fails with an error naming the missing variable instead of failing the handshake.

Slack's Web API answers HTTP 200 even when a call fails, with an ok: false body; channelchat surfaces that body's error string as the tool error, so channel_not_found and friends reach the caller verbatim.

Install

npx @reneturcios/channelchat slack_list_channels
docker run -i -e SLACK_BOT_TOKEN -e SLACK_TEAM_ID ghcr.io/cloudcorprecords/channelchat

Related MCP server: slackxmcp

CLI

channelchat slack_list_channels --limit 20
channelchat slack_post_message --channel-id C0123 --text "deploy finished"
channelchat slack_reply_to_thread --channel-id C0123 --thread-ts 1700000000.000100 --text "looking into it"
channelchat slack_add_reaction --channel-id C0123 --timestamp 1700000000.000100 --reaction thumbsup
channelchat slack_get_user_profile --user-id U0123
channelchat --version

Exit codes: 0 success, 1 API error, 2 usage error.

MCP server

npx -y @reneturcios/channelchat mcp

{
  "mcpServers": {
    "channelchat": {
      "command": "npx",
      "args": ["-y", "@reneturcios/channelchat", "mcp"],
      "env": { "SLACK_BOT_TOKEN": "xoxb-...", "SLACK_TEAM_ID": "T0123" }
    }
  }
}

Tools

Tool arguments use the caller-facing names from the documented surface (channel_id, thread_ts, reaction, user_id); the core maps them onto the Web API's parameter names (channel, ts, name, user) when it builds each request.

Development

npm install
npm run build
npm test
npm run dev

Tests run entirely on fake-fetch fixtures, including Slack's HTTP-200-with-ok: false error shape; no network is used.

License

MIT — see LICENSE.