{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://cognitive-agent.local/schemas/trace-event.schema.json",
  "title": "TraceEvent",
  "type": "object",
  "additionalProperties": false,
  "required": ["apiVersion", "kind", "event_id", "request_id", "timestamp", "stage", "status", "summary"],
  "properties": {
    "apiVersion": {"const": "cognitive-agent/v1alpha1"},
    "kind": {"const": "TraceEvent"},
    "event_id": {"type": "string", "minLength": 3},
    "request_id": {"type": "string", "minLength": 3},
    "timestamp": {"type": "string", "format": "date-time"},
    "stage": {
      "type": "string",
      "enum": ["intent_parse", "context_resolve", "domain_route", "function_generate", "scene_plan", "schema_validate", "domain_validate", "compile", "safety_check", "schedule", "execute", "state_update", "telemetry"]
    },
    "status": {"type": "string", "enum": ["started", "succeeded", "failed", "waiting_confirmation", "skipped"]},
    "domain": {"type": "string", "pattern": "^[a-z][a-z0-9_]*$"},
    "summary": {"type": "string", "minLength": 1, "maxLength": 1000},
    "artifact_refs": {
      "type": "array",
      "items": {"type": "string", "format": "uri-reference"}
    },
    "details": {
      "type": "object",
      "description": "Sanitized structured facts only; never store private chain-of-thought or secrets."
    },
    "duration_ms": {"type": "integer", "minimum": 0}
  }
}