Message Undelivered Input • AI Agent SDK

MessageUndeliveredInput: Input for MESSAGE_UNDELIVERED hooks (a reply could not be delivered).

MessageUndeliveredInput

Defined in the events module.

Input for MESSAGE_UNDELIVERED hooks (a reply could not be delivered).

Fired by the gateway when an outbound reply fails permanently (the target was confirmed dead, or delivery exhausted its retries) so operators can route the failure — mirror it to a home channel, alert, or re-queue — without patching adapters. It is a notification only: the reply has already been parked in the DLQ (when configured) and, best-effort, a short plain-text notice may have been attempted on the same channel.

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