Is it expected that Tool Call Response live Message Content

[pure-aero-98]

• AI-Dynamo Version: 0.7.1
• VLLM Version: 0.11.0
• Env: A10 GPU (Single)
• Start up: python -m dynamo.vllm --model <Qwen> and python -m frontend --http-port 8000

Request

curl "localhost:8000/v1/chat/completions" -H "Content-Type: application/json"   -d '{
    "model": "Qwen/Qwen2.5-7B-Instruct",
    "messages": [
        {
            "role": "user",
            "content": "What is the weather like today in London"
        }
    ],
    "stream":false,
    "max_tokens": 300,
    "tools": [
        {
            "type": "function",
            "function": {
                "name": "get_current_weather",
                "description": "Get the current weather in a given location",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "location": {
                            "type": "string",
                            "description": "The city and state, e.g. San Francisco, CA"
                        },
                        "unit": {
                            "type": "string",
                            "enum": ["celsius", "fahrenheit"]
                        }
                    },
                    "required": ["location"]
                }
            }
        }
    ]
  }' | jq

Got response

{
  "id": "chatcmpl-7d991140-6d78-4ad2-bc97-e8732fd2d012",
  "choices": [
    {
      "index": 0,
      "message": {
        "content": "<tool_call>\n{\"name\": \"get_current_weather\", \"arguments\": {\"location\": \"London\", \"unit\": \"celsius\"}}\n</tool_call>",
        "role": "assistant",
        "reasoning_content": null
      },
      "finish_reason": "stop"
    }
  ],
  "created": 1767137085,
  "model": "Qwen/Qwen2.5-7B-Instruct",
  "object": "chat.completion",
  "usage": {
    "prompt_tokens": 187,
    "completion_tokens": 28,
    "total_tokens": 215
  }
}

Is that expected that the JSON is embedded in a string? OpenAI API's spec says it should be a structured format.