Architect Condition Parser Rejecting Queue Occupancy Lookups

Architect & Flows
1

Trying to route inbound BYOC trunks through a dynamic Architect condition based on real-time queue occupancy. Running Genesys Cloud v24.8.1 in the ap-northeast-1 org. The /api/v2/architect/flows/{flowId}/actions endpoint keeps rejecting the condition payload with a 422 Unprocessable Entity. Error points to invalidExpressionSyntax on the queue status lookup.

Already tried swapping the data action for a direct REST call to /api/v2/queues/{queueId}/stats. Works fine in Postman, breaks in the flow runtime. It’s throwing timeoutExceeded after 3 seconds. Killed the Tokyo morning routing for two shifts yesterday.

Current workaround is polling the queue state every 15 minutes via a scheduled data action, then caching it in a flow variable. Doing jack all for real-time routing, but it stops the 422s. You’ll have to hardcode the fallback path instead of relying on the expression parser. The parser just can’t handle dynamic queue references.

Expression parser chokes on queue occupancy fields. Logs show parser failed to resolve property path when hitting the /api/v2/architect/conditions validation step.

2

The invalidExpressionSyntax error usually fires when the condition string drops the data. prefix or tries to evaluate a raw queue metric without a preceding data action. Architect doesn’t pull live stats directly inside the condition node. You’ll need a queues/lookup or queues/query data action first.

Check the payload structure. The condition expression must resolve to data.<data_action_name>.<metric_field>. For occupancy, that’s data.queues.occupancy or data.queues.availableAgents. If you’re patching the flow via the REST endpoint, the JSON usually looks like:

{
 "condition": {
 "type": "condition",
 "expression": "data.queues.occupancy > 5",
 "actions": []
 }
}

Watch the operator spacing. The parser sometimes chokes on > 5 if the SDK serializes it weirdly, but >5 or >=5 usually passes validation. Verify the data action id matches the reference in the condition. If you’re building this in a notebook, requests.patch(f"{base_url}/architect/flows/{flow_id}/actions", json=payload, headers=auth_headers) will return the exact validation error if the expression string violates the regex.

Queue metrics also require routing:queue:read scope on the auth token used for the API call. Missing scope sometimes masks as a syntax error in the response payload. Check the token scopes before retrying the patch. It’s strict about casing too. data.queues.Occupancy will fail. Stick to lowercase.

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3

Cause:
The parser throws 422 because Architect conditions cannot evaluate live queue metrics directly. The suggestion above covers the base requirement. You’ll need a queues/lookup data action to populate the context first. The Python SDK often masks this if you pass raw strings instead of structured ArchitectAction objects. Missing the data prefix breaks everything. It’s a common tripwire for new wrappers.

Solution:
Define the data action before the condition node. Here is the exact payload structure you need to push via PureCloudPlatformClientV2.FlowApi.post_flow_actions or directly in the flow JSON:

{
 "actions": [
 {
 "id": "queue_lookup",
 "type": "queues/lookup",
 "config": {
 "queueId": "data.system.queueId"
 }
 },
 {
 "id": "occupancy_check",
 "type": "condition",
 "config": {
 "expression": "data.queue_lookup.occupancy < 5",
 "outcomes": ["low_occupancy", "high_occupancy"]
 }
 }
 ]
}

Error:
If your wrapper serializes data.queue_lookup.occupancy as a Python float instead of a string, the API rejects it. Pydantic models in the GC spec expect strict string expressions for condition config. Make sure the retry decorator handles the 422 gracefully. The SDK type hints don’t enforce this automatically.

Check the inbound metadata mapping. The parser won’t wait for a fallback.

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4

The 422 Unprocessable Entity error on invalidExpressionSyntax fires because you’re trying to evaluate live metrics without a preceding data action to populate the context. You’ve got to add a queues/lookup action first and reference the output using the data. prefix in the condition expression.

"condition": "data.queueLookup.queue.occupancy > 5"

Make sure the data action ID matches exactly or the parser will reject it again.

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