Reason-Root-Email-Duplication

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. Users receive duplicate welcome emails only when signup retries after a timeout. The database has one user row but the email log has two sends. Identify the likely root cause.

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "side effect"
          ]
        },
        {
          "contains": [
            "retry"
          ]
        },
        {
          "contains": [
            "idempotency"
          ]
        }
      ]
    },
    "evidence": {
      "checks": [
        {
          "contains": [
            "one user row"
          ]
        },
        {
          "contains": [
            "two sends"
          ]
        },
        {
          "contains": [
            "timeout"
          ]
        }
      ]
    },
    "constraint": {
      "checks": [
        {
          "contains": [
            "welcome email"
          ]
        },
        {
          "contains": [
            "dedupe"
          ]
        },
        {
          "contains": [
            "idempotency key"
          ]
        }
      ]
    }
  }
}