{
  "type": "array",
  "description": "Contributing factors to failure. Often multiple factors combine. First element is primary.",
  "items": {
    "oneOf": [
      {
        "type": "string",
        "enum": [
          "performer_error",
          "structural_fragility",
          "context_mismatch",
          "inferential_collapse"
        ]
      },
      {
        "type": "object",
        "required": [
          "mode"
        ],
        "additionalProperties": false,
        "properties": {
          "mode": {
            "type": "string",
            "enum": [
              "performer_error",
              "structural_fragility",
              "context_mismatch",
              "inferential_collapse"
            ]
          },
          "mode_ref": {
            "type": "string",
            "description": "Reference to failure mode in taxonomy registry"
          },
          "description": {
            "type": "string",
            "description": "Additional context"
          }
        }
      }
    ]
  },
  "minItems": 1,
  "uniqueItems": true
}