Version Packages (beta) (#2512)
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21 changed files with 144 additions and 10 deletions
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"content-type-media-type-validation",
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"cross-bundle-error-instanceof",
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"examples-protected-wiring",
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"export-protocol-class",
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"initialize-session-hygiene",
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"lazy-ajv-engine",
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"lazy-era-wire-schemas",
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"malformed-resource-uri-invalid-params",
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"post-dispatch-32021-http-400",
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"prior-legacy-verdict",
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"probe-close-handling",
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"probe-window-handler-restore",
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"response-cache-document-codec",
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"schemas-source-home",
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"silent-validators-wave",
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"spec-3002-servinfo-meta",
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"standard-header-ows",
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"standard-schema-elicitation",
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"web-standard-bearer-auth",
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@ -1,5 +1,32 @@
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# @modelcontextprotocol/client
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## 2.0.0-beta.5
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### Minor Changes
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- [#2501](https://github.com/modelcontextprotocol/typescript-sdk/pull/2501) [`1480241`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1480241e2a2a7f0ceee8e7723b2adcf88579bb36) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Export the `Protocol` base class and `mergeCapabilities` from the `@modelcontextprotocol/client` and `@modelcontextprotocol/server` package roots, restoring the v1 import for consumers that subclass `Protocol` (e.g. the MCP Apps SDK). The client and server packages each bundle their own compiled copy of the class, so import it from one package consistently within a process.
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The codemod now rewrites `Protocol` and `mergeCapabilities` imports from `shared/protocol.js` to the client or server package root, like the module's other symbols, instead of dropping them with an action-required marker.
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- [#2511](https://github.com/modelcontextprotocol/typescript-sdk/pull/2511) [`f60dff0`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f60dff0674954ab516739f21ad9905349c8e9249) Thanks [@felixweinberger](https://github.com/felixweinberger)! - `ConnectOptions.prior` accepts a cached era verdict — the new exported type `PriorDiscovery`. `{ kind: 'modern', discover }` adopts a previously obtained `DiscoverResult` with zero round trips; `{ kind: 'legacy' }` skips the `server/discover` probe and runs the plain `initialize` handshake directly, for servers known out-of-band to be legacy — without pinning the client to `mode: 'legacy'`: stop supplying the verdict and `connect()` falls back to the configured `versionNegotiation` mode (under `'auto'`, it re-probes and rediscovers an upgraded server). Freshness is the supplying host's responsibility — a stale legacy verdict succeeds silently against an upgraded server, so hosts must date cached legacy verdicts in their own storage and stop supplying them past their policy horizon. Persisted-blob plumbing is hardened: `prior: null` is treated as absent, the modern arm's `discover` payload is schema-validated before any connection state changes, and an unrecognized shape rejects with a typed `SdkError(EraNegotiationFailed)` instead of a `TypeError`.
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- [#2513](https://github.com/modelcontextprotocol/typescript-sdk/pull/2513) [`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Align the 2026-07-28 wire with the final revision (spec PR #3002): `serverInfo` moves from the `DiscoverResult` body to the result `_meta`, and the per-request envelope's `clientInfo` demotes from required to SHOULD.
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Before this change the SDK shipped the pre-#3002 shape in both directions: the client hard-rejected a conforming server's `DiscoverResult` (missing body `serverInfo` failed parse, so the probe misclassified the server as legacy and attempted an `initialize` handshake against it — a hard connect failure against a modern-only server such as go-sdk v1.7.0-pre.3), and the server rejected conforming clients that omit `clientInfo`.
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Now:
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- The 2026 wire schemas are the final revision exactly: no body `serverInfo` on `DiscoverResult`, envelope `clientInfo` optional (a present-but-malformed value still fails validation).
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- Servers stamp `_meta['io.modelcontextprotocol/serverInfo']` on every 2026-era response (spec SHOULD; a handler-authored value wins, the 2025-era wire is untouched). This includes the entry-built `subscriptions/listen` graceful-close results — the spec's `SubscriptionsListenResultMeta` extends `ResultMetaObject`.
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- Clients keep sending `clientInfo` and read server identity from the discover result's `_meta` only. A server that stamps no identity is anonymous: `getServerVersion()` is `undefined` and the response cache partitions under a per-connection surrogate. A malformed `_meta` serverInfo value is treated as absent on receive (the spec marks the field self-reported, unverified, and display-only).
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- Breaking type changes: `DiscoverResult` no longer declares `serverInfo`; `RequestMetaEnvelope`'s `clientInfo` is optional. New public constant `SERVER_INFO_META_KEY` (`'io.modelcontextprotocol/serverInfo'`).
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### Patch Changes
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- [#2514](https://github.com/modelcontextprotocol/typescript-sdk/pull/2514) [`6fe1963`](https://github.com/modelcontextprotocol/typescript-sdk/commit/6fe196310ddba95a9f9655facb6b7c1ab503d346) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Probe stdio servers on a disposable sibling process. Some stdio servers exit on any pre-`initialize` request (servers built on the official Rust SDK, rmcp, behave this way), so under `versionNegotiation: { mode: 'auto' }` the `server/discover` probe previously killed the server and `connect()` hard-failed. The probe now runs on a short-lived sibling spawned from the same parameters — its stderr is discarded and it is reaped once the era is known — and the caller's transport spawns exactly once, afterwards: a legacy verdict connects with the plain `initialize` handshake (byte-identical to `mode: 'legacy'`), a modern verdict is adopted directly, and the session wire never carries `server/discover`. Closing the caller's transport during the probe aborts `connect()` with the typed `SdkError(EraNegotiationFailed)` and the session child is never spawned. On HTTP — and on custom stdio-shaped transports, which probe in place — a mid-probe connection close keeps rejecting with the typed connect error, now naming the close in pin-mode and modern-only diagnostics.
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- Updated dependencies [[`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313)]:
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- @modelcontextprotocol/core@2.0.0-beta.5
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## 2.0.0-beta.4
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### Minor Changes
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@ -1,6 +1,6 @@
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{
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"name": "@modelcontextprotocol/client",
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"version": "2.0.0-beta.4",
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"version": "2.0.0-beta.5",
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"description": "Model Context Protocol implementation for TypeScript - Client package",
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"license": "MIT",
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"author": "Anthropic, PBC (https://anthropic.com)",
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# @modelcontextprotocol/codemod
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## 2.0.0-beta.5
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### Patch Changes
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- [#2501](https://github.com/modelcontextprotocol/typescript-sdk/pull/2501) [`1480241`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1480241e2a2a7f0ceee8e7723b2adcf88579bb36) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Export the `Protocol` base class and `mergeCapabilities` from the `@modelcontextprotocol/client` and `@modelcontextprotocol/server` package roots, restoring the v1 import for consumers that subclass `Protocol` (e.g. the MCP Apps SDK). The client and server packages each bundle their own compiled copy of the class, so import it from one package consistently within a process.
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The codemod now rewrites `Protocol` and `mergeCapabilities` imports from `shared/protocol.js` to the client or server package root, like the module's other symbols, instead of dropping them with an action-required marker.
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## 2.0.0-beta.4
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### Patch Changes
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@ -1,6 +1,6 @@
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{
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"name": "@modelcontextprotocol/codemod",
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"version": "2.0.0-beta.4",
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"version": "2.0.0-beta.5",
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"description": "Codemod to migrate MCP TypeScript SDK code from v1 to v2",
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"license": "MIT",
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"author": "Anthropic, PBC (https://anthropic.com)",
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# @modelcontextprotocol/core-internal
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## 2.0.0-beta.4
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### Minor Changes
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- [#2501](https://github.com/modelcontextprotocol/typescript-sdk/pull/2501) [`1480241`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1480241e2a2a7f0ceee8e7723b2adcf88579bb36) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Export the `Protocol` base class and `mergeCapabilities` from the `@modelcontextprotocol/client` and `@modelcontextprotocol/server` package roots, restoring the v1 import for consumers that subclass `Protocol` (e.g. the MCP Apps SDK). The client and server packages each bundle their own compiled copy of the class, so import it from one package consistently within a process.
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The codemod now rewrites `Protocol` and `mergeCapabilities` imports from `shared/protocol.js` to the client or server package root, like the module's other symbols, instead of dropping them with an action-required marker.
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- [#2513](https://github.com/modelcontextprotocol/typescript-sdk/pull/2513) [`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Align the 2026-07-28 wire with the final revision (spec PR #3002): `serverInfo` moves from the `DiscoverResult` body to the result `_meta`, and the per-request envelope's `clientInfo` demotes from required to SHOULD.
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Before this change the SDK shipped the pre-#3002 shape in both directions: the client hard-rejected a conforming server's `DiscoverResult` (missing body `serverInfo` failed parse, so the probe misclassified the server as legacy and attempted an `initialize` handshake against it — a hard connect failure against a modern-only server such as go-sdk v1.7.0-pre.3), and the server rejected conforming clients that omit `clientInfo`.
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Now:
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- The 2026 wire schemas are the final revision exactly: no body `serverInfo` on `DiscoverResult`, envelope `clientInfo` optional (a present-but-malformed value still fails validation).
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- Servers stamp `_meta['io.modelcontextprotocol/serverInfo']` on every 2026-era response (spec SHOULD; a handler-authored value wins, the 2025-era wire is untouched). This includes the entry-built `subscriptions/listen` graceful-close results — the spec's `SubscriptionsListenResultMeta` extends `ResultMetaObject`.
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- Clients keep sending `clientInfo` and read server identity from the discover result's `_meta` only. A server that stamps no identity is anonymous: `getServerVersion()` is `undefined` and the response cache partitions under a per-connection surrogate. A malformed `_meta` serverInfo value is treated as absent on receive (the spec marks the field self-reported, unverified, and display-only).
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- Breaking type changes: `DiscoverResult` no longer declares `serverInfo`; `RequestMetaEnvelope`'s `clientInfo` is optional. New public constant `SERVER_INFO_META_KEY` (`'io.modelcontextprotocol/serverInfo'`).
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### Patch Changes
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- Updated dependencies [[`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313)]:
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- @modelcontextprotocol/core@2.0.0-beta.5
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## 2.0.0-beta.3
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### Patch Changes
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@ -1,7 +1,7 @@
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{
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"name": "@modelcontextprotocol/core-internal",
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"private": true,
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"version": "2.0.0-beta.3",
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"version": "2.0.0-beta.4",
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"description": "Model Context Protocol implementation for TypeScript - Core package",
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"license": "MIT",
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"author": "Anthropic, PBC (https://anthropic.com)",
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# @modelcontextprotocol/core
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## 2.0.0-beta.5
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### Minor Changes
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- [#2513](https://github.com/modelcontextprotocol/typescript-sdk/pull/2513) [`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Align the 2026-07-28 wire with the final revision (spec PR #3002): `serverInfo` moves from the `DiscoverResult` body to the result `_meta`, and the per-request envelope's `clientInfo` demotes from required to SHOULD.
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Before this change the SDK shipped the pre-#3002 shape in both directions: the client hard-rejected a conforming server's `DiscoverResult` (missing body `serverInfo` failed parse, so the probe misclassified the server as legacy and attempted an `initialize` handshake against it — a hard connect failure against a modern-only server such as go-sdk v1.7.0-pre.3), and the server rejected conforming clients that omit `clientInfo`.
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Now:
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- The 2026 wire schemas are the final revision exactly: no body `serverInfo` on `DiscoverResult`, envelope `clientInfo` optional (a present-but-malformed value still fails validation).
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- Servers stamp `_meta['io.modelcontextprotocol/serverInfo']` on every 2026-era response (spec SHOULD; a handler-authored value wins, the 2025-era wire is untouched). This includes the entry-built `subscriptions/listen` graceful-close results — the spec's `SubscriptionsListenResultMeta` extends `ResultMetaObject`.
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- Clients keep sending `clientInfo` and read server identity from the discover result's `_meta` only. A server that stamps no identity is anonymous: `getServerVersion()` is `undefined` and the response cache partitions under a per-connection surrogate. A malformed `_meta` serverInfo value is treated as absent on receive (the spec marks the field self-reported, unverified, and display-only).
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- Breaking type changes: `DiscoverResult` no longer declares `serverInfo`; `RequestMetaEnvelope`'s `clientInfo` is optional. New public constant `SERVER_INFO_META_KEY` (`'io.modelcontextprotocol/serverInfo'`).
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## 2.0.0-beta.4
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### Minor Changes
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@ -1,6 +1,6 @@
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{
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"name": "@modelcontextprotocol/core",
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"version": "2.0.0-beta.4",
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"version": "2.0.0-beta.5",
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"description": "Model Context Protocol for TypeScript — public Zod schemas (spec + OAuth/OpenID)",
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"license": "MIT",
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"author": "Anthropic, PBC (https://anthropic.com)",
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# @modelcontextprotocol/express
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## 2.0.0-beta.5
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### Patch Changes
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- Updated dependencies [[`1480241`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1480241e2a2a7f0ceee8e7723b2adcf88579bb36), [`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313)]:
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- @modelcontextprotocol/server@2.0.0-beta.5
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## 2.0.0-beta.4
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### Patch Changes
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{
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"name": "@modelcontextprotocol/express",
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"private": false,
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"version": "2.0.0-beta.4",
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"version": "2.0.0-beta.5",
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"description": "Express adapters for the Model Context Protocol TypeScript server SDK - Express middleware",
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"license": "MIT",
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"author": "Anthropic, PBC (https://anthropic.com)",
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# @modelcontextprotocol/fastify
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## 2.0.0-beta.5
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### Patch Changes
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- Updated dependencies [[`1480241`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1480241e2a2a7f0ceee8e7723b2adcf88579bb36), [`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313)]:
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- @modelcontextprotocol/server@2.0.0-beta.5
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## 2.0.0-beta.4
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### Patch Changes
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@ -1,7 +1,7 @@
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{
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"name": "@modelcontextprotocol/fastify",
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"private": false,
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"version": "2.0.0-beta.4",
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"version": "2.0.0-beta.5",
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"description": "Fastify adapters for the Model Context Protocol TypeScript server SDK - Fastify middleware",
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"license": "MIT",
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"author": "Anthropic, PBC (https://anthropic.com)",
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# @modelcontextprotocol/hono
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## 2.0.0-beta.5
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### Patch Changes
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- Updated dependencies [[`1480241`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1480241e2a2a7f0ceee8e7723b2adcf88579bb36), [`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313)]:
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- @modelcontextprotocol/server@2.0.0-beta.5
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## 2.0.0-beta.4
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### Patch Changes
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@ -1,7 +1,7 @@
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{
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"name": "@modelcontextprotocol/hono",
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"private": false,
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"version": "2.0.0-beta.4",
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"version": "2.0.0-beta.5",
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"description": "Hono adapters for the Model Context Protocol TypeScript server SDK - Hono middleware",
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"license": "MIT",
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"author": "Anthropic, PBC (https://anthropic.com)",
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# @modelcontextprotocol/node
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## 2.0.0-beta.5
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### Patch Changes
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- Updated dependencies [[`1480241`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1480241e2a2a7f0ceee8e7723b2adcf88579bb36), [`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313)]:
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- @modelcontextprotocol/server@2.0.0-beta.5
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## 2.0.0-beta.4
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### Patch Changes
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@ -1,6 +1,6 @@
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{
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"name": "@modelcontextprotocol/node",
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"version": "2.0.0-beta.4",
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"version": "2.0.0-beta.5",
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"description": "Model Context Protocol implementation for TypeScript - Node.js middleware",
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"license": "MIT",
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"author": "Anthropic, PBC (https://anthropic.com)",
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# @modelcontextprotocol/server-legacy
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## 2.0.0-beta.5
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### Patch Changes
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- Updated dependencies [[`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313)]:
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- @modelcontextprotocol/core@2.0.0-beta.5
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## 2.0.0-beta.4
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### Minor Changes
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@ -1,7 +1,7 @@
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{
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"name": "@modelcontextprotocol/server-legacy",
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"private": false,
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"version": "2.0.0-beta.4",
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"version": "2.0.0-beta.5",
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"description": "Frozen v1 SSE transport and OAuth Authorization Server helpers for the Model Context Protocol TypeScript SDK. Deprecated; use StreamableHTTP and a dedicated OAuth server in production.",
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"deprecated": "This package is a frozen copy of v1's SSE transport and OAuth Authorization Server helpers for migration purposes only. Use StreamableHTTP from @modelcontextprotocol/server and a dedicated OAuth server in production. Will not receive new features.",
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"license": "MIT",
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# @modelcontextprotocol/server
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## 2.0.0-beta.5
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### Minor Changes
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- [#2501](https://github.com/modelcontextprotocol/typescript-sdk/pull/2501) [`1480241`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1480241e2a2a7f0ceee8e7723b2adcf88579bb36) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Export the `Protocol` base class and `mergeCapabilities` from the `@modelcontextprotocol/client` and `@modelcontextprotocol/server` package roots, restoring the v1 import for consumers that subclass `Protocol` (e.g. the MCP Apps SDK). The client and server packages each bundle their own compiled copy of the class, so import it from one package consistently within a process.
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The codemod now rewrites `Protocol` and `mergeCapabilities` imports from `shared/protocol.js` to the client or server package root, like the module's other symbols, instead of dropping them with an action-required marker.
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|
||||
- [#2513](https://github.com/modelcontextprotocol/typescript-sdk/pull/2513) [`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Align the 2026-07-28 wire with the final revision (spec PR #3002): `serverInfo` moves from the `DiscoverResult` body to the result `_meta`, and the per-request envelope's `clientInfo` demotes from required to SHOULD.
|
||||
|
||||
Before this change the SDK shipped the pre-#3002 shape in both directions: the client hard-rejected a conforming server's `DiscoverResult` (missing body `serverInfo` failed parse, so the probe misclassified the server as legacy and attempted an `initialize` handshake against it — a hard connect failure against a modern-only server such as go-sdk v1.7.0-pre.3), and the server rejected conforming clients that omit `clientInfo`.
|
||||
|
||||
Now:
|
||||
- The 2026 wire schemas are the final revision exactly: no body `serverInfo` on `DiscoverResult`, envelope `clientInfo` optional (a present-but-malformed value still fails validation).
|
||||
- Servers stamp `_meta['io.modelcontextprotocol/serverInfo']` on every 2026-era response (spec SHOULD; a handler-authored value wins, the 2025-era wire is untouched). This includes the entry-built `subscriptions/listen` graceful-close results — the spec's `SubscriptionsListenResultMeta` extends `ResultMetaObject`.
|
||||
- Clients keep sending `clientInfo` and read server identity from the discover result's `_meta` only. A server that stamps no identity is anonymous: `getServerVersion()` is `undefined` and the response cache partitions under a per-connection surrogate. A malformed `_meta` serverInfo value is treated as absent on receive (the spec marks the field self-reported, unverified, and display-only).
|
||||
- Breaking type changes: `DiscoverResult` no longer declares `serverInfo`; `RequestMetaEnvelope`'s `clientInfo` is optional. New public constant `SERVER_INFO_META_KEY` (`'io.modelcontextprotocol/serverInfo'`).
|
||||
|
||||
### Patch Changes
|
||||
|
||||
- Updated dependencies [[`f413763`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f4137630c05dc9a4fb14d4d3777f5cb167bd6313)]:
|
||||
- @modelcontextprotocol/core@2.0.0-beta.5
|
||||
|
||||
## 2.0.0-beta.4
|
||||
|
||||
### Minor Changes
|
||||
|
|
|
|||
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