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The agent’s answer is streamed back in chunks followed by a completion event.

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AGENT_RESPONSE_CHUNK

Partial agent output. 
{
  "type": "AGENT_RESPONSE_CHUNK",
  "eventId": "evt_2",
  "threadId": "thread_456",
  "requestId": "req_1",
  "eventMessage": {
    "agent": null,
    "content": "hel",
    "collaborationId": null,
    "activeAssistantCollaborationRequired": null,
    "toolExecutionApprovalRequest": null,
    "timestamp": "2025-08-12T00:00:01"
  }
}

​
AGENT_RESPONSE_COMPLETE

Final agent output with the full response text. 
{
  "type": "AGENT_RESPONSE_COMPLETE",
  "eventId": "evt_3",
  "threadId": "thread_456",
  "requestId": "req_1",
  "eventMessage": {
    "agent": null,
    "content": "hello",
    "collaborationId": null,
    "activeAssistantCollaborationRequired": null,
    "toolExecutionApprovalRequest": null,
    "timestamp": "2025-08-12T00:00:02"
  }
}
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