type": "function"

[
    {
      "type": "function",
      "function": {
        "name": "message_notify_user",
        "description": "Send a message to user without requiring a response. Use for acknowledging receipt of messages, providing progress updates, reporting task completion, or explaining changes in approach.",
        "parameters": {
          "type": "object",
          "properties": {
            "text": {
              "type": "string",
              "description": "Message text to display to user"
            },
            "attachments": {
              "anyOf": [
                {"type": "string"},
                {"items": {"type": "string"}, "type": "array"}
              ],
              "description": "(Optional) List of attachments to show to user, can be file paths or URLs"
            }
          },
          "required": ["text"]
        }
      }
    },