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[Server][Protocol] SEP-2260: Scope server-to-client requests to in-flight client requests #343
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2026-07-28All issues and PRs related to the spec release 2026-07-28All issues and PRs related to the spec release 2026-07-28ClientIssues & PRs related to the Client componentIssues & PRs related to the Client componentP0Broken core functionality, security issues, critical missing featureBroken core functionality, security issues, critical missing featureServerIssues & PRs related to the Server componentIssues & PRs related to the Server componentbreaking changeBreaking the Backwards Compatibility PromiseBreaking the Backwards Compatibility PromiseenhancementRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supportedimproves spec complianceImproves consistency with other SDKs such as TyepScriptImproves consistency with other SDKs such as TyepScript
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2026-07-28All issues and PRs related to the spec release 2026-07-28All issues and PRs related to the spec release 2026-07-28ClientIssues & PRs related to the Client componentIssues & PRs related to the Client componentP0Broken core functionality, security issues, critical missing featureBroken core functionality, security issues, critical missing featureServerIssues & PRs related to the Server componentIssues & PRs related to the Server componentbreaking changeBreaking the Backwards Compatibility PromiseBreaking the Backwards Compatibility PromiseenhancementRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supportedimproves spec complianceImproves consistency with other SDKs such as TyepScriptImproves consistency with other SDKs such as TyepScript
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Implements SEP-2260 for the MCP Spec 2026-07-28 release.
Tracked by umbrella #334.
Spec summary
PHP SDK changes
src/Server/Protocol.php— Fiber-based server-initiated requests must validate they are running inside a client request's Fiber context. Block/error on unsolicited dispatch.src/Schema/Request/CreateSamplingMessageRequest.php,ElicitRequest.php,ListRootsRequest.php— require/encode the originating client request ID in_meta(verify final spec field name).src/Client/Protocol.php— client must reject server-initiated requests with no associated client request ID.CLAUDE.mdanddocs/server-client-communication.md.Notifications remain unaffected (this is requests-only).
Breaking change. Touches public Fiber suspension behavior used by tool authors.
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