AGUI402

Severity: warning · Group: Reasoning · Checked in: core · Since: 0.x

Message: {startType} messageId '{messageId}' never ended

Spec grounding

Reasoning events support LLM reasoning visibility and continuity, enabling chain-of-thought reasoning while maintaining privacy.

Source: https://docs.ag-ui.com/concepts/events#reasoning-events

The spec is not fully explicit here; the ambiguity is tracked as SQ-4 and the severity is capped accordingly (false positives are worse than false negatives).

Example

A violating stream from the corpus (spec/fixtures/invalid/AGUI402-reasoning-unterminated):

{"type":"RUN_STARTED","threadId":"thread_001","runId":"run_001","timestamp":1755300018700}
{"type":"REASONING_START","messageId":"rsn_001","timestamp":1755300018800}
{"type":"RUN_FINISHED","threadId":"thread_001","runId":"run_001","outcome":{"type":"success"},"timestamp":1755300018900}

Expected findings:

• warning AGUI402 at event 2 — REASONING_START messageId 'rsn_001' never ended