{
  "id": "turn_abc123",
  "messages": [
    {
      "role": "system",
      "content": {
        "text": "<string>",
        "reference_texts": [
          {
            "content": "<string>",
            "category": "<string>",
            "url": "<string>"
          }
        ],
        "attachments": [
          {
            "content": "aSDinaTvuI8gbWludGxpZnk=",
            "mime_type": "text/plain",
            "scale_url": "<string>",
            "url": "<string>",
            "name": "<string>"
          }
        ],
        "chunks": [
          {
            "type": "<string>",
            "annotations": [
              {}
            ],
            "text": "<string>"
          }
        ],
        "reasoning": [
          {
            "content": "<string>"
          }
        ]
      },
      "source_id": "source_abc123",
      "model_parameters": {
        "model": "my-model-123",
        "temperature": 0.9,
        "max_completion_tokens": 1000,
        "top_p": 0.9,
        "top_k": 4
      },
      "annotations": [
        {}
      ]
    }
  ],
  "annotations": [
    {}
  ]
}