Sec-Oauth-Pkce-Verifier

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. An OAuth public client stores the PKCE code_verifier in localStorage and reuses the same verifier across login attempts.

{
  "metrics": {
    "correct": {
      "checks": [
        {
          "contains": [
            "PKCE"
          ]
        },
        {
          "contains": [
            "code_verifier"
          ]
        },
        {
          "contains": [
            "reuse"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "per request"
          ]
        },
        {
          "contains": [
            "state binding"
          ]
        },
        {
          "contains": [
            "localStorage risk"
          ]
        }
      ]
    }
  }
}