{
  "model_name": "test-invalid-params",
  "expects": {
    "tools_used": ["echo"],
    "min_responses": 1
  },
  "steps": [
    {
      "request_hint": { "last_user_message_contains": "echo" },
      "response": {
        "type": "tool_calls",
        "tool_calls": [
          {
            "id": "call_bad_echo",
            "name": "echo",
            "arguments": { "message": 12345 }
          }
        ],
        "input_tokens": 100,
        "output_tokens": 25
      }
    },
    {
      "response": {
        "type": "tool_calls",
        "tool_calls": [
          {
            "id": "call_good_echo",
            "name": "echo",
            "arguments": { "message": "corrected message" }
          }
        ],
        "input_tokens": 200,
        "output_tokens": 25
      }
    },
    {
      "response": {
        "type": "text",
        "content": "The echo tool initially received a number instead of a string. After correcting the parameter type, the echo returned: corrected message.",
        "input_tokens": 300,
        "output_tokens": 30
      }
    }
  ]
}