{
  "timestamp": "2025-01-02T03:04:05.678Z",
  "type": "response_item",
  "payload": {
    "type": "function_call",
    "id": "legacy-function",
    "name": "shell",
    "arguments": "{\"command\":[\"echo\",\"hi\"]}",
    "call_id": "call-123"
  }
}