Node.js WebSocket 400 on Agent Assist sentiment injection with atomic SEND validation failure

NICE CXone API & Integrations
1

The injection payload contains the Interaction ID and Emotion Classification Matrix. The Admin UI confirms the Agent Assist Configuration is active, yet the Node.js script fails to inject real-time sentiment scores via the WebSocket API. We’ve exceeded the maximum update frequency limit even with the throttle delay. The server returns a 400 Bad Request on the atomic SEND operation. The Urgency Routing Directive causes false escalation triggers. The error log follows.

{
 "error": "INJECTION_VALIDATION_FAILED",
 "message": "Schema violation: emotion_score out of bounds",
 "interactionId": "x-99283",
 "timestamp": "2023-10-27T14:00:00Z"
}
2

The 400 usually hits when the emotion matrix keys don’t match the exact camelCase schema expected by the Agent Assist channel. GC drops the entire atomic SEND if the payload shape drifts. Happens all the time when CRM sync scripts forget to flatten nested objects. Real pain to debug over raw sockets.

{
 "type": "agentassist.sentiment.update",
 "interactionId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
 "sentiment": {
 "confidence": 0.85,
 "classification": "frustrated",
 "urgency": 0
 }
}

Make sure the classification string matches your registered taxonomy. The urgency routing directive trips when you pass a boolean instead of the expected integer score. Throttle delays won’t fix schema mismatches. You’ll want to validate the shape against the PureCloudPlatformClientV2 schema before piping it over. Cross reference it with /api/v2/agentassist/configurations using the agentassist:send scope. How are you handling the timestamp serialization right now? Usually the issue sits in the serialization layer.

3

The suggestion above regarding the camelCase schema is spot on. The validator drops the entire atomic SEND if the payload shape drifts even slightly. It’s frustrating when the documentation doesn’t specify the strictness level. You’ll hit that 400 consistently if the keys aren’t exact. The platform expects a rigid structure for these updates. Any deviation causes the rejection.

  • Problem: The injection payload contains nested objects. The WebSocket endpoint rejects anything that isn’t flat. The schema expects specific top-level keys for the sentiment data. Nested arrays or objects inside the sentiment block trigger the validation failure immediately. The system can’t parse the matrix if it’s wrapped.
  • Code: Flatten the emotion matrix before sending. Use this structure to bypass the validation error. This payload matches the expected schema. Ensure the interaction ID is a valid UUID string.
{
 "type": "agentassist.sentiment.update",
 "interactionId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
 "sentimentScore": 0.85,
 "confidence": 0.92
}
  • Error: A 400 response confirms the shape mismatch. If the interaction ID is malformed, you’ll get a different code. Check the headers too. The rate limiter won’t trigger if the payload is invalid. You might see timeout errors if the connection drops.
  • Question: Inspect the response body directly. The code field will reveal the exact key mismatch causing the rejection. Sometimes the error message is vague. Look for the specific field name in the error details.