Agent backends
Both examples use the same event envelope, durable
event_id deduplication,
and REST reply path. A saved webhook subscription selects Webhook delivery.
With none saved, Relay uses WebSocket.
Messaging
Reliability
Use these pages beside every example:- Idempotency for safe command retries.
- Webhook Delivery for HTTP retry behavior.
- WebSocket Acknowledgements for durable cumulative ACKs.
- WebSocket FULL Sync for stale checkpoints.

