{
  "$schema": "http://json-schema.org/draft-07/schema",
  "title": "WorkerEvent",
  "description": "Worker lifecycle and state transition events",
  "type": "object",
  "required": ["event_id", "kind", "worker_id", "timestamp"],
  "properties": {
    "event_id": {
      "type": "string",
      "description": "Unique event identifier"
    },
    "kind": {
      "enum": [
        "spawning",
        "trust_required",
        "trust_resolved",
        "ready_for_prompt",
        "running",
        "finished",
        "failed"
      ],
      "description": "Event type"
    },
    "worker_id": {
      "type": "string",
      "description": "Unique worker identifier"
    },
    "timestamp": {
      "type": "integer",
      "description": "Unix epoch seconds"
    },
    "payload": {
      "type": "object",
      "description": "Event-specific data"
    }
  }
}