AGUI202

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

Message: TOOL_CALL_END for toolCallId '{toolCallId}' with no open TOOL_CALL_START

Spec grounding

toolCallId: Matches the ID from ToolCallStart

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

Example

A violating stream from the corpus (spec/fixtures/invalid/AGUI202-end-without-start):

{"type":"RUN_STARTED","threadId":"thread_001","runId":"run_001","timestamp":1755300013300}
{"type":"TOOL_CALL_END","toolCallId":"call_ghost","timestamp":1755300013400}
{"type":"RUN_FINISHED","threadId":"thread_001","runId":"run_001","outcome":{"type":"success"},"timestamp":1755300013500}

Expected findings:

• error AGUI202 at event 1 — TOOL_CALL_END for toolCallId 'call_ghost' with no open TOOL_CALL_START