Slack MCP Server

Instructions

Implementation Reference

• slack_mcp/server.py:257-272 (handler)

  The main MCP tool handler for 'list_users'. Decorated with @mcp.tool() for registration. Creates SlackClient, calls its list_users method, and returns JSON-formatted result.

  @mcp.tool()
  async def list_users(limit: int = 100, include_locale: bool = False) -> str:
      """
      List all users in the Slack workspace.
  
      Args:
          limit: Maximum number of users to return
          include_locale: Include locale information for each user
      """
      try:
          client = SlackClient()
          result = await client.list_users(limit, include_locale)
          return json.dumps(result, indent=2)
      except Exception as e:
          return json.dumps({"error": str(e)}, indent=2)

• slack_mcp/server.py:92-95 (helper)

  Helper method in SlackClient class that makes the API call to Slack's 'users.list' endpoint.

  async def list_users(self, limit: int = 100, include_locale: bool = False) -> Dict[str, Any]:
      """List all users in the workspace."""
      params = {"limit": limit, "include_locale": include_locale}
      return await self._make_request("GET", "users.list", params=params)