Reason-Constraint-Shard-Routing

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. Tenant A is pinned to shard 3 for residency, but a new hash router sends it to shard 7. Decide which rule wins and what invariant is violated.

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "pinned"
          ]
        },
        {
          "contains": [
            "shard 3"
          ]
        },
        {
          "contains": [
            "residency"
          ]
        }
      ]
    },
    "evidence": {
      "checks": [
        {
          "contains": [
            "hash router"
          ]
        },
        {
          "contains": [
            "shard 7"
          ]
        },
        {
          "contains": [
            "tenant"
          ]
        }
      ]
    },
    "constraint": {
      "checks": [
        {
          "contains": [
            "pinning overrides hash"
          ]
        },
        {
          "contains": [
            "invariant"
          ]
        },
        {
          "contains": [
            "violation"
          ]
        }
      ]
    }
  }
}