{
  "events": [
    {
      "author": "user",
      "content": {
        "parts": [
          {
            "text": "Hi"
          }
        ],
        "role": "user"
      },
      "id": "e-1",
      "invocationId": "i-1",
      "nodeInfo": {
        "path": ""
      }
    },
    {
      "author": "callback_demo_agent",
      "content": {
        "parts": [
          {
            "text": "Hello from before_model callback!"
          }
        ],
        "role": "model"
      },
      "id": "e-2",
      "invocationId": "i-1",
      "nodeInfo": {
        "path": "callback_demo_agent@1"
      }
    }
  ]
}