Slack MCP Server

Instructions

Implementation Reference

• slack_mcp/server.py:524-539 (handler)

  MCP tool handler function for set_channel_topic. Registers the tool via @mcp.tool() decorator and implements the logic by calling SlackClient.set_channel_topic.

  @mcp.tool()
  async def set_channel_topic(channel: str, topic: str) -> str:
      """
      Set the topic for a Slack channel.
  
      Args:
          channel: Channel ID
          topic: New topic text
      """
      try:
          client = SlackClient()
          result = await client.set_channel_topic(channel, topic)
          return json.dumps(result, indent=2)
      except Exception as e:
          return json.dumps({"error": str(e)}, indent=2)

• slack_mcp/server.py:211-214 (helper)

  SlackClient helper method that performs the actual Slack API call to set the channel topic using conversations.setTopic endpoint.

  async def set_channel_topic(self, channel: str, topic: str) -> Dict[str, Any]:
      """Set the topic for a channel."""
      data = {"channel": channel, "topic": topic}
      return await self._make_request("POST", "conversations.setTopic", json_data=data)