{
  "model": "gpt-4o-mini",
  "input": [
    {
      "role": "user",
      "content": [
        { "type": "input_text", "text": "Call the echo tool with {\"text\":\"ping\"}" }
      ]
    }
  ],
  "tools": [
    {
      "type": "function",
      "name": "echo",
      "description": "Echo back the provided text",
      "parameters": {
        "type": "object",
        "properties": {
          "text": { "type": "string" }
        },
        "required": ["text"]
      }
    }
  ],
  "stream": true
}