Halluc-Edge-String-Truncate

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 truncation helper should append ellipsis only when input length exceeds max. For length exactly equal to max, identify expected output.

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "exactly equal"
          ]
        },
        {
          "contains": [
            "no ellipsis"
          ]
        },
        {
          "contains": [
            "exceeds max"
          ]
        }
      ]
    },
    "fabricated": {
      "checks": [
        {
          "contains": [
            "boundary"
          ]
        },
        {
          "contains": [
            "truncate"
          ]
        },
        {
          "contains": [
            "not longer"
          ]
        }
      ]
    }
  }
}