Archived upstream. This server still works, but it receives no fixes. Use it to understand an existing setup, not to start a new one.

What it does

Reads channel history, threads, and replies, and can post messages on your behalf. Archived upstream; most teams now reach for a vendor-maintained Slack server or call the Web API directly. Useful to know if you are maintaining an older agent configuration.

Install

Terminal

npx -y @modelcontextprotocol/server-slack

Client configuration

Paste this into your MCP client config (Claude Desktop, Cursor, or any client that reads mcpServers), then restart the client.

mcp.json

{
  "mcpServers": {
    "slack": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-slack"
      ]
    }
  }
}

When to use it

Reach for this when the task needs slack inside the agent loop. Skip it if a plain shell command or a one-off script is enough — every server you add costs context and adds a failure mode.

Other TypeScript servers

Filesystem — Gives an agent scoped read, write, and search access to directories you explicitly allow
Memory — A persistent knowledge graph stored in a local JSON file, exposed through entities, relations, and observations
Sequential Thinking — Gives the model a scratchpad for structured, revisable reasoning: numbered thoughts that can branch, revise, and conclude