AGUI102

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

Message: TEXT_MESSAGE_END for messageId '{messageId}' with no open TEXT_MESSAGE_START

Spec grounding

messageId: Matches the ID from TextMessageStart

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

Example

A violating stream from the corpus (spec/fixtures/invalid/AGUI102-end-without-start):

{"type":"RUN_STARTED","threadId":"thread_001","runId":"run_001","timestamp":1755300010700}
{"type":"TEXT_MESSAGE_END","messageId":"msg_ghost","timestamp":1755300010800}
{"type":"RUN_FINISHED","threadId":"thread_001","runId":"run_001","outcome":{"type":"success"},"timestamp":1755300010900}

Expected findings:

• error AGUI102 at event 1 — TEXT_MESSAGE_END for messageId 'msg_ghost' with no open TEXT_MESSAGE_START