Reason-Root-Cache-Poisoning

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. Anonymous users sometimes see another tenant's branding after a CDN rollout. Cache keys include path but omit Host and tenant headers. Identify the root cause.

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "cache key"
          ]
        },
        {
          "contains": [
            "omit Host"
          ]
        },
        {
          "contains": [
            "tenant"
          ]
        }
      ]
    },
    "evidence": {
      "checks": [
        {
          "contains": [
            "CDN rollout"
          ]
        },
        {
          "contains": [
            "branding"
          ]
        },
        {
          "contains": [
            "another tenant"
          ]
        }
      ]
    },
    "constraint": {
      "checks": [
        {
          "contains": [
            "cache poisoning"
          ]
        },
        {
          "contains": [
            "vary"
          ]
        },
        {
          "contains": [
            "tenant isolation"
          ]
        }
      ]
    }
  }
}