Reasoning-Fce-Idempotent-Retry-Proof

The model receives the prompt (and optional system message). The run uses scorer rubric_json_metrics with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Return JSON only with keys answer, evidence, constraints. A payment API claims retries are idempotent because the client sends the same amount each time. Show why that is insufficient without an idempotency key.

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "same amount"
          ]
        },
        {
          "contains": [
            "not enough"
          ]
        },
        {
          "contains": [
            "idempotency key"
          ]
        }
      ]
    },
    "evidence": {
      "checks": [
        {
          "contains": [
            "payment API"
          ]
        },
        {
          "contains": [
            "retry"
          ]
        },
        {
          "contains": [
            "duplicate charge"
          ]
        }
      ]
    },
    "constraint": {
      "checks": [
        {
          "contains": [
            "counterexample"
          ]
        },
        {
          "contains": [
            "request identity"
          ]
        },
        {
          "contains": [
            "side effect"
          ]
        }
      ]
    }
  }
}