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If processing fails, an ERROR event is emitted and the stream closes. 
{
  "type": "ERROR",
  "eventId": "evt_error",
  "threadId": "thread_456",
  "requestId": "req_1",
  "eventMessage": {
    "agent": null,
    "content": "timeout",
    "collaborationId": null,
    "activeAssistantCollaborationRequired": null,
    "toolExecutionApprovalRequest": null,
    "timestamp": "2025-08-12T00:00:05"
  }
}