MCP Observer Server

Instructions

Implementation Reference

• src/mcp_observer_server/server.py:207-220 (handler)

  The execution logic for the 'subscribe_default' tool within the call_tool_handler function. It subscribes the current session to the default watched.txt file by adding it to the global 'watched' dictionary and notifies if it's a new path.

  elif name == "subscribe_default":
      default_file = (
          Path("src/mcp_observer_server/watched.txt").expanduser().resolve()
      )
      is_new_path = default_file not in watched
      watched.setdefault(default_file, set()).add(session)
  
      # Send notification if this is a new path being watched
      if is_new_path:
          asyncio.create_task(send_resources_list_changed_notification())
  
      return [
          TextContent(type="text", text=f"Subscribed to default file: {default_file}")
      ]

• src/mcp_observer_server/server.py:89-97 (registration)

  Registration of the 'subscribe_default' tool in the @server.list_tools() handler, defining its name, description, and empty input schema.

  Tool(
      name="subscribe_default",
      description="Subscribe to the default watched.txt file for development",
      inputSchema={
          "type": "object",
          "properties": {},
          "additionalProperties": False,
      },
  ),

• src/mcp_observer_server/server.py:92-96 (schema)

  Input schema for the 'subscribe_default' tool, which requires no parameters.

  inputSchema={
      "type": "object",
      "properties": {},
      "additionalProperties": False,
  },