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Merge branch 'main' into feature/v2-codemode-draft
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‎.changeset/cfworker-out-of-barrel.md‎

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'@modelcontextprotocol/server': patch
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'@modelcontextprotocol/client': patch
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Stop bundling `@cfworker/json-schema` into the main package barrel. Previously `CfWorkerJsonSchemaValidator` was re-exported from the core internal barrel, so tsdown inlined the `@cfworker/json-schema` dev dependency into every consumer's bundle even when it was never used. The validator is now reachable only via the `_shims` conditional (workerd/browser) and the explicit `@modelcontextprotocol/{server,client}/validators/cf-worker` subpath, so consumers that don't opt into it no longer ship that code. No public API change.

‎.changeset/custom-methods-minimal.md‎

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'@modelcontextprotocol/core': minor
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'@modelcontextprotocol/client': minor
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'@modelcontextprotocol/server': minor
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Add custom (non-spec) method support: a 3-arg `setRequestHandler(method, schemas, handler)` / `setNotificationHandler(method, schemas, handler)` form for vendor-prefixed methods, and a `request(req, resultSchema)` overload (also on `ctx.mcpReq.send`) for typed custom-method results. Spec-method calls are unchanged.
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Response result-schema validation failure now rejects with `SdkError(InvalidResult)` instead of a raw `ZodError`. Adds `SdkErrorCode.InvalidResult`.

‎.changeset/express-resource-server-auth.md‎

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'@modelcontextprotocol/express': minor
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Add OAuth Resource-Server glue to the Express adapter: `requireBearerAuth` middleware (token verification + RFC 6750 `WWW-Authenticate` challenges), `mcpAuthMetadataRouter` (serves RFC 9728 Protected Resource Metadata and mirrors RFC 8414 AS metadata at the resource origin), the `getOAuthProtectedResourceMetadataUrl` helper, and the `OAuthTokenVerifier` interface. These restore the v1 `src/server/auth` Resource-Server pieces as first-class v2 API so MCP servers can plug into an external Authorization Server with a few lines of Express wiring.

‎.changeset/gentle-planets-rest.md‎

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Add `| undefined` to optional callback and function properties on `WebStandardStreamableHTTPServerTransportOptions` (`sessionIdGenerator`, `onsessioninitialized`, `onsessionclosed`) and corresponding private fields.
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This fixes TS2430 errors for consumers using `exactOptionalPropertyTypes: true` without `skipLibCheck`, where optional properties with function types need explicit `| undefined` to match their emitted declarations.

‎.changeset/hono-peer-optional.md‎

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'@modelcontextprotocol/node': patch
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Mark `hono` peer dependency as optional. `@modelcontextprotocol/node` only uses `getRequestListener` from `@hono/node-server` (Node HTTP ↔ Web Standard conversion), which does not require the `hono` framework at runtime. Consumers no longer need to install `hono` to use `NodeStreamableHTTPServerTransport`. Note: `@hono/node-server` itself still declares `hono` as a hard peer, so package managers may emit a warning; this is upstream and harmless for `getRequestListener`-only usage.

‎.changeset/legacy-module-resolution-types.md‎

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'@modelcontextprotocol/client': patch
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'@modelcontextprotocol/server': patch
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'@modelcontextprotocol/node': patch
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'@modelcontextprotocol/express': patch
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'@modelcontextprotocol/fastify': patch
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'@modelcontextprotocol/hono': patch
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Add top-level `types` field (and `typesVersions` on client/server for their subpath exports) so consumers on legacy `moduleResolution: "node"` can resolve type declarations. The `exports` map remains the source of truth for `nodenext`/`bundler` resolution. The `typesVersions` map includes entries for subpaths added by sibling PRs in this series (`zod-schemas`, `stdio`); those entries are no-ops until the corresponding `dist/*.d.mts` files exist.

‎.changeset/register-rawshape-compat.md‎

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`registerTool`/`registerPrompt` accept a raw Zod shape (`{ field: z.string() }`) for `inputSchema`/`outputSchema`/`argsSchema` in addition to a wrapped Standard Schema. Raw shapes are auto-wrapped with `z.object()`. The raw-shape overloads are `@deprecated`; prefer wrapping with `z.object()`.
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Also widens the `completable()` constraint from `StandardSchemaWithJSON` to `StandardSchemaV1` so v1's `completable(z.string(), fn)` continues to work.

‎.changeset/spec-type-schema.md‎

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Export `isSpecType` and `specTypeSchemas` records for runtime validation of any MCP spec type by name. `isSpecType.ContentBlock(value)` is a type predicate; `specTypeSchemas.ContentBlock` is a `StandardSchemaV1<ContentBlock>` validator. Guards are standalone functions, so `arr.filter(isSpecType.ContentBlock)` works. Also export the `SpecTypeName` and `SpecTypes` types.

‎.changeset/stdio-subpath-export.md‎

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'@modelcontextprotocol/client': minor
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Move stdio transports to a `./stdio` subpath export. Import `StdioClientTransport`, `getDefaultEnvironment`, `DEFAULT_INHERITED_ENV_VARS`, and `StdioServerParameters` from `@modelcontextprotocol/client/stdio`, and `StdioServerTransport` from `@modelcontextprotocol/server/stdio`. The `@modelcontextprotocol/client` root entry no longer pulls in `node:child_process`, `node:stream`, or `cross-spawn`, fixing bundling for browser and Cloudflare Workers targets; the `@modelcontextprotocol/server` root entry drops its `node:stream` reference. Node.js, Bun, and Deno consumers update the import path; runtime behavior is unchanged.

‎.changeset/wraphandler-hook.md‎

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refactor: subclasses override `_wrapHandler` hook instead of redeclaring `setRequestHandler`.

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