AGUI503

Severity: error · Group: Transport · Checked in: core · Since: 0.x

Message: Unknown event type '{type}' (not in the installed AG-UI SDK v{sdkVersion}, and not RAW or CUSTOM)

Spec grounding

Events in the protocol are categorized by their purpose.

Source: https://docs.ag-ui.com/concepts/events#event-types-overview

Example

A violating stream from the corpus (spec/fixtures/invalid/AGUI503-unknown-event-type):

{"type":"RUN_STARTED","threadId":"thread_001","runId":"run_001","timestamp":1755300021600}
{"type":"AGUI_PING","timestamp":1755300021700}
{"type":"RUN_FINISHED","threadId":"thread_001","runId":"run_001","outcome":{"type":"success"},"timestamp":1755300021800}

Expected findings:

• error AGUI503 at event 1 — Unknown event type 'AGUI_PING' (not in the installed AG-UI SDK v0.0.59, and not RAW or CUSTOM)