Identity review, contract approval and signing, state-machine transitions, federation, and payment processing can outlive the HTTP request that initiated them.
The public material describes several possible observation surfaces:
The Agent API does not document one durable webhook mechanism for every operation. Confirm how the target Neuron reports completion before implementing background processing.
State-handling pattern
- Persist the returned domain identifier before leaving the initiating request.
- Record an application-owned pending state.
- Observe with the verified query, message, event, or operator-mediated mechanism.
- Make repeated observations idempotent.
- Distinguish approved/finalized, rejected/failed, expired, and still-pending outcomes.
- Define a timeout and a human-visible recovery path.
See Realtime browser events for the documented interactive bridge. 
