Node.js WebSocket Agent Assist injection payload failing schema validation on DOM limits

Running a Node.js 18 script to push knowledge snippets into the Agent Assist panel via the wss://api.genesys.cloud/platform/websocket endpoint. The upstream JSONPath transform feeds the injection payload, but the gateway throws a 400 Bad Request on the max_dom_updates constraint before it even hits the UI render queue. We’re constructing the payload with article references, a relevance score matrix, and explicit UI placement directives.

Here’s the JSON structure we’re sending through the atomic SEND operation:

{
 "action": "inject_snippet",
 "payload": {
 "article_ref": "kb-eu-0922",
 "relevance_matrix": [0.94, 0.87, 0.76],
 "placement": "right_panel_primary",
 "scroll_buffer_trigger": true,
 "freshness_check": "2024-05-12T14:30:00Z",
 "cross_ref_validated": true
 },
 "audit": {
 "latency_ms": 42,
 "injector_id": "auto-assist-v2"
 }
}

The WebSocket handshake succeeds. Token auth holds up fine. Problem is the rendering engine rejects anything that looks like it’ll push past the DOM update ceiling. We’re trying to prevent interface lag failures during assist scaling, but the validation pipeline keeps flagging the relevance matrix as malformed. It’s just a standard float array.

Trying to expose this as a reusable snippet injector for automated management. The format verification step blocks the scroll buffer trigger every single time. Audit logs show successful transmission on our end, but the display success rate sits at zero. The docs barely mention the atomic SEND payload shape.

{
 "type": "agent-assist-injection",
 "contextId": "{{session_id}}",
 "items": [
 {
 "knowledgeItemId": "kb-article-8842",
 "score": 0.94,
 "metadata": { "uiSlot": "primary", "source": "nlu-bot" }
 }
 ]
}

Problem

The gateway rejects max_dom_updates because it’s missing from the official schema. You’re forcing a custom constraint that the validator chokes on.

Code

Strip that field and map the relevance matrix into the metadata object. The platform handles rendering throttles internally.

Error

Pushing that structure bypasses the 400. If you still hit a mismatch, verify your /api/v2/knowledge/documents fetch. You’ll need agent-assist:inject plus knowledge:view on the service account.

Question

Are you routing this through the PureCloudPlatformClientV2 WebSocket manager or a raw wrapper? The SDK handles heartbeat pacing automatically. Usually the wrapper drops frames anyway.

PureCloudPlatformClientV2 manages the WebSocket handshake explicitly, so injecting max_dom_updates triggers a schema rejection. You’ll need to route this via the architect flow config instead. I tried overriding the socket header, but it caused state drift.

{ "flowId": "your-flow-id", "settings": { "agentAssist": { "maxUpdates": 10 } } }

The whole provider state breaks.