Debug-Global-Variable-Pollution-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 helper function assigns to a variable without let, const, or var; the variable becomes an implicit global and its value persists across separate function calls, corrupting subsequent results. Identify the missing declaration and fix it.

{
  "metrics": {
    "repro": {
      "checks": [
        {
          "contains": [
            "global"
          ]
        },
        {
          "contains": [
            "persists"
          ]
        },
        {
          "contains": [
            "across calls"
          ]
        },
        {
          "contains": [
            "variable"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "const"
          ]
        },
        {
          "contains": [
            "let"
          ]
        },
        {
          "contains": [
            "declaration"
          ]
        }
      ]
    },
    "diagnose": {
      "checks": [
        {
          "contains": [
            "implicit global"
          ]
        },
        {
          "contains": [
            "missing declaration"
          ]
        },
        {
          "contains": [
            "accidental global"
          ]
        }
      ]
    }
  }
}