OpenAI API (unofficial showcase)
POST/agents/sessions/{session_id}/events

Create agent session input events

Submits message, cancellation, tool-result, or computer-use approval-response events to a managed agent session. Cancellation can recover a still-open turn whose backend execution has ended by marking it cancelled and abandoning unpublished outputs. Saved results, published files, and existing terminal outcomes are preserved. HTTP 202 confirms acceptance, not durable completion. See session events.

  • IdempotentThe SDK sends Idempotency-Key, so a retried request is only applied once.

2 parameters · 1 body field
session_idstringrequired
The ID of the session.
Idempotency-Keystringoptional
An optional client-generated key that makes retries of submitted messages idempotent.
eventsarray<object>required
The input events to submit to the session.

8 status codes
202The events were accepted.
400The request was invalid.
errorobjectrequired
The error returned by the API.
401Authentication or project context was missing.
errorobjectrequired
The error returned by the API.
403The API key lacks the required permission.
errorobjectrequired
The error returned by the API.
404The requested session or event was not found.
errorobjectrequired
The error returned by the API.
409The request conflicted with the current session state.
errorobjectrequired
The error returned by the API.
500An internal error occurred.
errorobjectrequired
The error returned by the API.
503The service is temporarily unavailable.
errorobjectrequired
The error returned by the API.

Error handling

A 400 is returned: The request was invalid. A 401 is returned: Authentication or project context was missing. A 403 is returned: The API key lacks the required permission. A 404 is returned: The requested session or event was not found. A 409 is returned: The request conflicted with the current session state. A 500 is returned: An internal error occurred. A 503 is returned: The service is temporarily unavailable.