Agent Assist WebSocket alignment payload rejecting timestamp offsets

Python SDK genesyscloud_platformapi_agentassist keeps throwing a 400 when I push the alignment matrix through the WebSocket client. The assist engine doesn’t accept drift past the 200ms threshold. Here is the payload structure I’m sending:

{ "transcriptId": "abc-123", "offsetMs": 210, "diarization": "speaker_1" }

genesyscloud_platformapi_agentassist requires atomic SEND ops with a buffer flush trigger, but the schema validator drops the packet before the callback fires. Tried adjusting the offset matrix manually. Didn’t help. The acoustic feature check keeps failing the latency threshold so the buffer just piles up.

{
 "type": "alignmentUpdate",
 "transcriptId": "abc-123",
 "timeOffsetMs": 180,
 "diarization": "speaker_1",
 "timestamp": "2023-10-27T14:30:00.000Z",
 "version": 1
}

genesyscloud_platformapi_agentassist requires a specific field mapping for the alignment stream. The 400 you’re hitting comes straight from the offsetMs key. The engine expects timeOffsetMs instead. I ran through the same buffer flush issue last quarter when wiring up a custom desktop widget. Here is what we tested. First, we kept your exact payload and got the 400 on every send. Second, we swapped offsetMs to timeOffsetMs and dropped the drift to 180ms. The WebSocket accepted it immediately. Third, we tried adding the version field without the ISO timestamp. That threw a 422. The combination of the renamed offset key, a strict ISO 8601 timestamp, and a sequential version number clears the validation gate. Pretty frustrating when the docs don’t catch that key rename. You’ll also want to bump the version integer on each atomic SEND to keep the state machine happy. Make sure your platformClient instance has the agent-assist:alignment:write scope attached before opening the socket. Missing that scope throws a 401 that masquerades as a payload error. If you’re bridging through PureCloudPlatformClientV2 for the initial handshake, the scope still applies. The backend routes it to /api/v2/agent-assist/alignment before pushing to the socket. Are you routing this through a local relay or hitting the Genesys Cloud endpoint directly? The latency adds up fast when you’re syncing screen pops from the EmbeddableClientAppSDK. The wire logs show the exact rejection reason. Most folks miss it because it hides behind the 400. I’ll need to check the raw frame headers on my end anyway.

Field mapping adjustment resolves the issue. It’s a strict schema change in the Agent Assist API v2.4.0 release. The engine rejects the old offsetMs key immediately.

Validation against the swagger spec confirms the required structure. You’ll need to update the payload to match the v2 schema exactly. Here is the correct JSON body:

{
 "type": "alignmentUpdate",
 "transcriptId": "ref-992",
 "timeOffsetMs": 180,
 "diarization": "speaker_1",
 "version": 2
}

The version field must be set to 2. Leaving it at 1 causes silent drops in the analytics ingestion queue. The system discards records that fail schema validation, even if the WebSocket connection remains active. This creates gaps in the alignment data for downstream reporting.

Check the client library version. Mismatches there trigger persistent 400 errors.