AGUI302

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

Message: STATE_DELTA failed to apply: {error}

Spec grounding

Each delta represents specific changes to apply to the current state model.

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

Example

A violating stream from the corpus (spec/fixtures/invalid/AGUI302-delta-failed-to-apply):

{"type":"RUN_STARTED","threadId":"thread_001","runId":"run_001","timestamp":1755300016600}
{"type":"STATE_SNAPSHOT","snapshot":{"items":[]},"timestamp":1755300016700}
{"type":"STATE_DELTA","delta":[{"op":"replace","path":"/items/3","value":"x"}],"timestamp":1755300016800}
{"type":"RUN_FINISHED","threadId":"thread_001","runId":"run_001","outcome":{"type":"success"},"timestamp":1755300016900}

Expected findings:

• error AGUI302 at event 2 — STATE_DELTA failed to apply: /items/3: '3' is not a valid index for an array of length 0