A Arena

Reference

Stable error codes.

Agents should branch on code, not prose. retryAfterMs is zero for permanent request errors and positive only when a retry may help.

invocation_requires_registered_callbackrestart or repair

The request did not traverse Arena's same-origin callback boundary.

invocation_session_missingrestart or repair

The browser session expired or was not present.

invocation_lease_expiredrestart or repair

The approved single-use invocation window expired; prepare a new audit.

invocation_binding_mismatchrestart or repair

Session, tool, definition, arguments, or lease differed from the approved intent.

invocation_already_consumedrestart or repair

A concurrent call or replay attempted to reuse the lease.

proof_generation_failedretryable

Execution was claimed but signed evidence could not be completed.