[Schema][Client][Server] Deprecate Roots, Sampling and Logging (SEP-2577) - #427
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Implements SEP-2577 (deprecating Roots, Sampling and Logging as of protocol revision
2026-07-28, earliest removal2027-07-28) following the Tier 1 SDK obligations in SEP-2596:@deprecatedtags on the schema, client and server surface of the three features, each referencing the SEP, the earliest removal date and the suggested migration.ClientGateway::log()/sample()/listRoots(), or registering a client-sideSamplingRequestHandler,ListRootsRequestHandlerorLoggingNotificationHandler— viatrigger_deprecation()(symfony/deprecation-contracts, silencedE_USER_DEPRECATED), so it surfaces in phpunit-bridge / debug tooling without noise in production. Deliberately not on capability advertisement:loggingis always advertised, and a server should not warn because the client declaredroots/sampling.server-client-communication.md,mcp-elements.mdandclient.md.Not included: the
disableDeprecatedFeatures()opt-out floated in #365 — nothing in the spec asks for it and it is an independent feature if anyone needs it.Everything remains fully functional until removal.
Closes #365