Halluc-Bug-Off-By-One

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, supported_facts, uncertainty. A bug report says loop i <= items.length accesses one element too far. Confirm the actual bug and avoid claiming memory corruption in JavaScript.

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "i <= items.length"
          ]
        },
        {
          "contains": [
            "one element too far"
          ]
        },
        {
          "contains": [
            "undefined"
          ]
        }
      ]
    },
    "fabricated": {
      "checks": [
        {
          "contains": [
            "memory corruption"
          ]
        },
        {
          "contains": [
            "avoid claiming"
          ]
        },
        {
          "contains": [
            "JavaScript"
          ]
        }
      ]
    }
  }
}