Sec-Jwt-Alg-None

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 verdict, risk, mitigation. A JWT verifier trusts the alg header from the token and accepts tokens with alg set to none.

{
  "metrics": {
    "correct": {
      "checks": [
        {
          "contains": [
            "JWT"
          ]
        },
        {
          "contains": [
            "alg none"
          ]
        },
        {
          "contains": [
            "signature"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "allowed algorithms"
          ]
        },
        {
          "contains": [
            "verify"
          ]
        },
        {
          "contains": [
            "reject none"
          ]
        }
      ]
    }
  }
}