feat: add subscription listen streams (SEP-2575)#1000
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alexhancock
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| .map(ServerResult::DiscoverResult), | ||
| ClientRequest::PingRequest(_request) => { | ||
| self.ping(context).await.map(ServerResult::empty) | ||
| if mrtr_supported { |
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Should we consolidate helpers for this? It stands out to me that I did something slightly different for detecting (and now validating) legacy requests in #999
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@alexhancock Extracted uses_legacy_lifecycle and reused it in both tower.rs and server.rs.
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Motivation and Context
SEP-2575 replaces the old way of delivering notifications through
resources/subscribe,resources/unsubscribe, and standalone Streamable HTTP GET streams. It introduces a new transport-neutral request calledsubscriptions/listen. This update brings in typed models and high-level server/client APIs that ensure acknowledgment ordering, subscription ID tagging, opt-in filtering, concurrent stream isolation, cancellation, and smooth or abrupt termination for both stdio and Streamable HTTP.We still support legacy resource subscriptions, HTTP sessions, GET/DELETE, and resumable streams for older protocol versions.
How Has This Been Tested?
Add tests. The conformance suite passes
Breaking Changes
No existing stable-protocol behavior is removed. The legacy
subscribe()andunsubscribe()APIs are deprecated for the 2026 protocol revision but retain their existing wire behavior for older negotiated versions.Types of changes
Checklist