Debug-Worker-Message-Order-V2

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 diagnosis, fix, tests. A worker pool assumes responses arrive in dispatch order and assigns results by array index, mixing outputs under load. Identify the bug and fix.

{
  "metrics": {
    "repro": {
      "checks": [
        {
          "contains": [
            "responses"
          ]
        },
        {
          "contains": [
            "dispatch order"
          ]
        },
        {
          "contains": [
            "array index"
          ]
        },
        {
          "contains": [
            "under load"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "request id"
          ]
        },
        {
          "contains": [
            "correlation"
          ]
        },
        {
          "contains": [
            "Map"
          ]
        }
      ]
    },
    "diagnose": {
      "checks": [
        {
          "contains": [
            "worker pool"
          ]
        },
        {
          "contains": [
            "message order"
          ]
        },
        {
          "contains": [
            "mixing"
          ]
        }
      ]
    }
  }
}