{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Multimodal RAG answer card",
  "type": "object",
  "required": ["query_id", "decision", "answer", "evidence", "limits", "next_action", "metrics"],
  "properties": {
    "query_id": {"type": "string"},
    "decision": {"enum": ["answer", "review", "block"]},
    "answer": {"type": "string"},
    "evidence": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["source_id", "modality", "fact_id"],
        "properties": {
          "source_id": {"type": "string"},
          "modality": {"type": "string"},
          "fact_id": {"type": "string"},
          "page": {"type": ["integer", "null"]},
          "region_id": {"type": ["string", "null"]},
          "score": {"type": "number"}
        }
      }
    },
    "limits": {"type": "array", "items": {"type": "string"}},
    "next_action": {"type": "string"},
    "metrics": {"type": "object"}
  }
}