AGUI502

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

Message: Event payload is not valid JSON: {error}

Spec grounding

All events share a common set of base properties.

Source: https://docs.ag-ui.com/concepts/events#base-event-properties

Example

A violating stream from the corpus (spec/fixtures/invalid/AGUI502-payload-not-json):

{"type":"RUN_STARTED","threadId":"thread_001","runId":"run_001","timestamp":1755300021400}
{"type": broken json
{"type":"RUN_FINISHED","threadId":"thread_001","runId":"run_001","outcome":{"type":"success"},"timestamp":1755300021500}

Expected findings:

• error AGUI502 at event 1 — Event payload is not valid JSON: Unexpected token 'b', "{"type": broken json" is not valid JSON