What probably matters to youSection of the release
A new SDK system message subtype, cloud_session_delta, lets a cloud-hosted session's headless stream-json client push incremental updates (serving state, connection status, in-flight tool calls, directory sync) between full init snapshots instead of requiring a full re-init each time. The cloud session emitter tracks the last emitted session block and, on later changes, debounces and emits a cloud_session_delta event containing just the changed keys.
The cloud_session field on stream-json init frames also gains connection (connecting/live/reconnecting) and calls (live and recent tool calls served to the cloud session, tracked by id and tool name only), so a desktop/SDK host can show whether its bridge to a cloud session is up and what tool calls are in flight or recently finished, without exposing call input/output.
