René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"subscriptions/listen","articleBody":"The opt-in long-lived notification stream: server accepts a filter, acks first, routes only opted-in types, tags with `subscriptionId`; client demux helper for #2894 to wire in.\n\n## What's in it\n\n- Server: accept `subscriptions/listen` with a filter, send the ack first, route only opted-in notification types, tag each with `subscriptionId`.\n- A way for the existing notification publishers (list_changed, resources/updated) to feed the listen stream.\n- Client demux helper (open/maintain stream, demux by id, re-subscribe after a stdio reconnect) — wired in by #2894.\n\n## Conformance\n\n- The `sep-2575-server-*` subscription checks inside `server-stateless` run (not skip) and pass\n- Together with _Backwards compatibility \u0026 version negotiation_, _New HTTP serving path (modern + dual-era)_, _Capabilities API + server/discover handler_, _Context object (layered, per-request)_: `server-stateless`\n\n## Dependencies\n\n- Depends on: #2893\n\n## References\n\n- [Subscriptions](https://modelcontextprotocol.io/specification/draft/basic/patterns/subscriptions)\n- [SEP-2575](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2575)\n","author":{"url":"https://github.com/maxisbey","@type":"Person","name":"maxisbey"},"datePublished":"2026-06-17T11:12:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/2901/python-sdk/issues/2901"}