Maxsubscriptions
The 2026-era subscriptions/listen channel: the server publishes change events
through a ServerEventBus, and Client.listen() opens an async iterator over
them. Replaces the handshake-era resources/subscribe + standalone-GET
notification path.
Status: not yet implemented (#2901).
The lowlevel registration surface is in this base —
#2967
(ae13ede) added the lowlevel on_subscriptions_listen handler slot — but
there is no Client.listen() or ServerEventBus yet. The runnable story is
deliberately a follow-up PR to keep this one reviewable.
Spec
Subscriptions — basic utilities
Working example elsewhere
The TypeScript SDK ships a runnable subscriptions story:
typescript-sdk/examples/subscriptions.
See also
standalone_get/ (handshake-era server-initiated notifications), resources/
(legacy subscribe deliberately omitted).