AGUI101

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

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

Spec grounding

A message begins with a TextMessageStart event, followed by one or more TextMessageContent events that deliver chunks of text as they become available, and concludes with a TextMessageEnd event.

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

Example

A violating stream from the corpus (spec/fixtures/invalid/AGUI101-content-without-start):

{"type":"RUN_STARTED","threadId":"thread_001","runId":"run_001","timestamp":1755300010400}
{"type":"TEXT_MESSAGE_CONTENT","messageId":"msg_ghost","delta":"orphan","timestamp":1755300010500}
{"type":"RUN_FINISHED","threadId":"thread_001","runId":"run_001","outcome":{"type":"success"},"timestamp":1755300010600}

Expected findings:

• error AGUI101 at event 1 — TEXT_MESSAGE_CONTENT for messageId 'msg_ghost' with no open TEXT_MESSAGE_START