{
  "success_case": {
    "terminal": "success",
    "answer": "明天有雨，降雨概率约 80%。",
    "trace": [
      {
        "step": 1,
        "decision": "tool",
        "tool": "weather",
        "observation": {
          "city": "上海",
          "condition": "rain",
          "rain_probability": 0.8
        }
      },
      {
        "step": 2,
        "decision": "final",
        "answer": "明天有雨，降雨概率约 80%。"
      }
    ]
  },
  "stopping_case": {
    "terminal": "budget_exhausted",
    "reason": "max_steps",
    "trace": [
      {
        "step": 1,
        "decision": "tool",
        "tool": "weather",
        "observation": {
          "city": "上海",
          "condition": "rain",
          "rain_probability": 0.8
        }
      },
      {
        "step": 2,
        "decision": "tool",
        "tool": "weather",
        "observation": {
          "city": "上海",
          "condition": "rain",
          "rain_probability": 0.8
        }
      },
      {
        "step": 3,
        "decision": "tool",
        "tool": "weather",
        "observation": {
          "city": "上海",
          "condition": "rain",
          "rain_probability": 0.8
        }
      }
    ]
  }
}