{
  "caseId": "external-reference",
  "diagnosis": {
    "version": "3.0.3",
    "canRepair": false,
    "issues": [
      {
        "ruleId": "oas.externalRef",
        "severity": "error",
        "title": "External reference is blocked",
        "path": "/paths/~1items/get/responses/200/content/application~1json/schema/$ref",
        "fixable": false
      }
    ]
  },
  "preview": {
    "available": false,
    "patches": [],
    "after": null,
    "outputFile": null
  },
  "preservation": "Report blocked reference; no fixture-time fetch calls; do not invent the target schema."
}