Bump the npm group across 3 directories with 5 updates

[dependabot]

Bumps the npm group with 4 updates in the /mcp-client-typescript directory: @anthropic-ai/sdk, @modelcontextprotocol/client, dotenv and @types/node.
Bumps the npm group with 3 updates in the /tests/helpers directory: @modelcontextprotocol/client, @types/node and @modelcontextprotocol/server.
Bumps the npm group with 2 updates in the /weather-server-typescript directory: @types/node and @modelcontextprotocol/server.

Updates @anthropic-ai/sdk from 0.127.0 to 0.131.0

Release notes

Sourced from @​anthropic-ai/sdk's releases.

sdk: v0.131.0

0.131.0 (2026-09-30)

Full Changelog: sdk-v0.130.0...sdk-v0.131.0

Features

• api: add list spend limits endpoint (cfb78c8)

Chores

• client: deprecate sonnet 4.5 (d72cfaf)

sdk: v0.130.0

0.130.0 (2026-09-30)

Full Changelog: sdk-v0.129.0...sdk-v0.130.0

Features

• api: add a refusal stop reason and stop_details to Managed Agents session idle events (5cd6910)
• api: add Claude Enterprise analytics, spend limits, and RBAC groups and roles to the Admin API (109c766)
• api: add per-user usage and cost reports to the Admin API analytics (0a74a28)
• api: add Plugins and Plugin Marketplaces to the Admin API (40c2160)
• api: add repository error types to Managed Agents session errors (6735615)
• api: allow removing a plugin's org-wide installation setting (c7d120f)
• api: MCP tunnels beta: add read-only transport object to Tunnel and return the one-time relay token in the create response (b0e57ce)
• api: Organization API endpoints are now GA (1a1fd8f)

Bug Fixes

• api: make memory store description, metadata, archived_at required (ed68900)
• api: type admin plugin preference and marketplace fields as enums (942ae01)
• pagination: auto-paging continues past an empty page while next_page is set (2d75266)
• tool-runner: only send API fields for runnable tools (#404) (a62c2a2)
• tools: stop the session tool runner after any idle that ends the turn (#878) (cab32f8)

Chores

• api: update MCP Tunnels types and descriptions (394d60c)
• docs: remove placeholder enum descriptions (04f0812)
• tests: fixture update (#381) (9cfe4d4)

sdk: v0.129.0

0.129.0 (2026-09-28)

Full Changelog: sdk-v0.128.0...sdk-v0.129.0

... (truncated)

Changelog

Sourced from @​anthropic-ai/sdk's changelog.

0.131.0 (2026-09-30)

Full Changelog: sdk-v0.130.0...sdk-v0.131.0

Features

• api: add list spend limits endpoint (cfb78c8)

Chores

• client: deprecate sonnet 4.5 (d72cfaf)

0.130.0 (2026-09-30)

Full Changelog: sdk-v0.129.0...sdk-v0.130.0

Features

• api: add a refusal stop reason and stop_details to Managed Agents session idle events (5cd6910)
• api: add Claude Enterprise analytics, spend limits, and RBAC groups and roles to the Admin API (109c766)
• api: add per-user usage and cost reports to the Admin API analytics (0a74a28)
• api: add Plugins and Plugin Marketplaces to the Admin API (40c2160)
• api: add repository error types to Managed Agents session errors (6735615)
• api: allow removing a plugin's org-wide installation setting (c7d120f)
• api: MCP tunnels beta: add read-only transport object to Tunnel and return the one-time relay token in the create response (b0e57ce)
• api: Organization API endpoints are now GA (1a1fd8f)

Bug Fixes

• api: make memory store description, metadata, archived_at required (ed68900)
• api: type admin plugin preference and marketplace fields as enums (942ae01)
• pagination: auto-paging continues past an empty page while next_page is set (2d75266)
• tool-runner: only send API fields for runnable tools (#404) (a62c2a2)
• tools: stop the session tool runner after any idle that ends the turn (#878) (cab32f8)

Chores

• api: update MCP Tunnels types and descriptions (394d60c)
• docs: remove placeholder enum descriptions (04f0812)
• tests: fixture update (#381) (9cfe4d4)

0.129.0 (2026-09-28)

Full Changelog: sdk-v0.128.0...sdk-v0.129.0

Features

... (truncated)

Commits

• d49bdab Merge pull request #1230 from anthropics/release-please--branches--main--chan...
• 4759f20 chore: release main
• 9ded9f3 codegen metadata
• d72cfaf chore(client): deprecate sonnet 4.5
• cfb78c8 feat(api): add list spend limits endpoint
• e8f4c28 Merge branch 'main' into next
• e6ca605 Merge pull request #1229 from anthropics/release-please--branches--main--chan...
• 2dd6192 chore: release main
• cab32f8 fix(tools): stop the session tool runner after any idle that ends the turn (#...
• 0a74a28 feat(api): add per-user usage and cost reports to the Admin API analytics
• Additional commits viewable in compare view

Updates @modelcontextprotocol/client from 2.0.0 to 2.2.0

Release notes

Sourced from @​modelcontextprotocol/client's releases.

@​modelcontextprotocol/client@​2.2.0

Minor Changes

• #2887 edd12e2 Thanks @​maxisbey! - Constructing ClientCredentialsProvider, PrivateKeyJwtProvider, StaticPrivateKeyJwtProvider or CrossAppAccessProvider without expectedIssuer is deprecated: the constructor logs one console.warn and that call signature is marked @deprecated. Behaviour is otherwise unchanged. Pass the issuer of the authorization server the credentials were registered with.

  fetchToken() throws AuthorizationServerMismatchError, before sending anything, when the provider's client information is bound to a different authorization server than the one it is called with. The AuthorizationServerMismatchError message no longer assumes the authorization-code callback; its fields are unchanged.

  OAuthTokensSchema and OAuthClientInformationSchema accept the optional issuer stamp, so a provider that reads storage back through them keeps it. auth() overwrites it on every save.

Patch Changes

• #2885 9dd722f Thanks @​claude! - Sending a notification on a closed connection no longer produces a briefly unhandled promise rejection (seen as unhandledrejection on Cloudflare Workers) in addition to the returned rejection.

• #2883 c0f7aec Thanks @​claude! - Fix a type-check failure for CommonJS TypeScript projects introduced in 2.1.0: dist/index.d.cts imported types from jose, which is ESM-only, so tsc with module: node16/node18 and skipLibCheck: false failed with TS1479. The two jose types used by the DPoP API (CryptoKey, JWK) are now inlined into the declaration files. No runtime change.

• #2768 efebf5b Thanks @​web-abin! - Correct the JSDoc for insecure OAuth token endpoints. The TLS requirement comes from the MCP authorization specification's OAuth 2.1 communication-security rules, not SEP-2207, which covers OIDC-flavored refresh-token guidance. Documentation only; no runtime behavior change.

• #2729 a4ae2f9 Thanks @​claude! - Correct the registerClient @deprecated notice: Dynamic Client Registration was deprecated by spec PR modelcontextprotocol#2858 (Client ID Metadata Documents), not SEP-2577 (which deprecates roots, sampling, and logging). The notice now also names the earliest possible removal date under the feature lifecycle policy (2027-07-28) and clarifies that the client_id_metadata_document_supported gating lives in the built-in auth() flow — registerClient called directly always sends the registration request. Documentation only; no runtime behavior change.

• #2862 e780e13 Thanks @​SyedTashfin! - Preserve _meta on input_required results. The 2026-07-28 decode seam rebuilt the payload from inputRequests and requestState only, so result-level metadata a server sent on an input_required result (including io.modelcontextprotocol/serverInfo) was dropped before an allowInputRequired: true caller could see it. Result._meta is a result-level field, so input_required carries it exactly like any other result.

• #2886 ef39308 Thanks @​claude! - listTools(), listPrompts(), listResources() and listResourceTemplates() called without a cursor now follow nextCursor until the server stops sending one, instead of stopping silently with a short list when a cursor repeats; a page that has the same items and the same nextCursor as the page before it ends the walk and is not added twice, and listMaxPages still caps the walk.

• #2642 cfa09db Thanks @​claude! - Fix Client.listen() rejections escaping as process-level unhandled rejections. The internal opening promise could reject (ack timeout, transport close, server cancel, caller abort) while listen() was still serially awaiting transport.send(...), so no rejection handler was attached yet — the rejection surfaced as an unhandledRejection that caller-side handling cannot prevent, and a send that never settles (e.g. a stdio write parked on 'drain') left listen() suspended forever even though the ack timer had already fired. listen() now suspends on the opening state machine directly and routes send failures into it, so every termination path rejects the returned promise and nothing escapes.

• #2597 7f7a94c Thanks @​arimu1! - Treat hostnames ending in .localhost as loopback for the SEP-2207 token-endpoint https guard (RFC 6761 §6.3), so host-based multi-tenant local OAuth works. The SDK does not resolve the name itself: *.localhost reaches the local machine only if the system resolver follows RFC 6761.

• Updated dependencies [edd12e2]:

  • @​modelcontextprotocol/core@​2.2.0

@​modelcontextprotocol/client@​2.1.0

Minor Changes

• #2629 dcc0102 Thanks @​gbshankar! - Add DPoP (RFC 9449 / SEP-1932) sender-constrained access token support to the client.
  • Opt in by implementing OAuthClientProvider.dpop() returning a DpopSession (new, along with generateDpopKeyPair, accessTokenHash, isDpopNonceChallenge). auth() / exchangeAuthorization / refreshAuthorization / fetchToken then sign a DPoP proof into token requests (retrying once on an authorization-server use_dpop_nonce challenge, with client authentication re-applied per attempt), and StreamableHTTPClientTransport, SSEClientTransport and withOAuth present a token_type: "DPoP" access token as Authorization: DPoP <token> plus a fresh per-request proof, retry a resource-server use_dpop_nonce challenge once, and pick up a DPoP-Nonce delivered on any response. Tokens the AS issued as Bearer are still presented as Bearer.
  • DPoP is applied at the fetch layer: the transports wrap their resource-server fetch (including a caller-supplied fetch / eventSourceInit.fetch) with the new withDpopFromProvider(provider) middleware, so proofs are always bound to the request actually sent. withDpop(session, getToken) is exported for callers that manage tokens themselves (e.g. alongside a minimal AuthProvider); the AuthProvider interface itself is unchanged.
  • auth() now recovers from invalid_dpop_proof on refresh (e.g. a refresh token bound to a key that is no longer held) by discarding the tokens and re-authorizing, like invalid_grant. OAuthErrorCode gains InvalidDpopProof and UseDpopNonce; extractWWWAuthenticateParams recognizes the DPoP challenge scheme; OAuthMetadataSchema gains dpop_signing_alg_values_supported.

Patch Changes

• #2726 6fa4227 Thanks @​LuckTerence! - SdkError and SdkHttpError accept standard ErrorOptions as an optional fourth constructor argument and forward it to Error, so a wrapped error is reachable through the standard Error.cause chain. Version-negotiation probe failures (SdkErrorCode.EraNegotiationFailed) now use it: the underlying TypeError: fetch failed and the DNS or socket error beneath it surface via error.cause, so pino, Sentry, and util.inspect render ENOTFOUND / ECONNREFUSED / ETIMEDOUT instead of stopping at the SdkError (#2657). The previous error.data.cause slot is still populated for compatibility but is deprecated and slated for removal; read error.cause instead.

• #2654 03842cd Thanks @​pshah19! - Treat request id 0 as a real id. Two guards tested a RequestId for truthiness, so the legal JSON-RPC ids 0 and '' were read as absent. Id 0 is not a corner case: the outbound request counter is zero-based, so it is the first id every peer assigns, which on the server→client leg is the first sampling/createMessage, elicitation/create, or roots/list a server sends.

  • notifications/cancelled carrying id 0 was ignored, and the in-flight handler ran to completion with its AbortSignal never fired.
  • A notification sent with relatedRequestId: 0 wrongly passed the debounce gate (for methods opted into debouncedNotificationMethods). Because the pending set is keyed by method alone, a second such notification in the same tick was silently dropped rather than sent.

  Absent is now the only value that means "no id".

• #2043 c4248a9 Thanks @​ChrisJr404! - On Windows, stdio servers spawned by StdioClientTransport now also inherit COMSPEC, PATHEXT, PROGRAMDATA, PROGRAMFILES(X86), PROGRAMW6432, and WINDIR (added to DEFAULT_INHERITED_ENV_VARS). Programs a server launches can depend on them: PowerShell finds no native executables without PATHEXT, and Windows OpenSSH exits 255 without ProgramData.

... (truncated)

Commits

• dd22ba2 Version Packages (#2849)
• c55efa6 fix(server): close a listen stream that has honored nothing (#2651)
• edd12e2 fix(client): deprecate omitting expectedIssuer and apply the SEP-2352 issuer ...
• ef39308 fix(client): follow nextCursor until it is absent; stop on a repeated page (#...
• 9dd722f fix(core): await the notification send so a failed send is never briefly unha...
• e780e13 fix(client): preserve _meta on input_required results (#2862)
• a4ae2f9 docs(client): correct the registerClient deprecation citation to spec PR #285...
• efebf5b docs(client): correct token endpoint TLS citation (#2768)
• d992df7 chore: remove CODEOWNERS patterns that match nothing on main (#2884)
• c0f7aec fix(client): inline jose types in the CommonJS declaration file (#2883)
• Additional commits viewable in compare view

Updates dotenv from 18.0.1 to 18.0.5

Changelog

Sourced from dotenv's changelog.

18.0.5 (2026-09-30)

Changed

• Fix missing typescript module declaration (#1068)
• Improve performance for large .env files (#1066)

18.0.4 (2026-09-25)

Changed

• import dotenv/config should default quiet: true (#1063)

18.0.3 (2026-09-22)

Changed

• Patch DOTENV_QUIET setting when inside .env file (#1059)

18.0.2 (2026-09-21)

Changed

• Patch additional edge cases for the fast parser (#1056)

Commits

• 05215e0 18.0.5
• 25bdd0a changelog
• 2d640d2 Merge pull request #1066 from AyanAta42/master
• c84e2b4 Merge pull request #1068 from matzehecht/fix-typescript
• 570146a Optimize fast parser comment scanning
• 4aa0665 add typescript module declaration for dotenv/config
• f1380ec Bound fast parser comment scans to the current line
• a626f72 add link
• b36a142 video links
• 86804c0 18.0.4
• Additional commits viewable in compare view

Updates @types/node from 24.13.4 to 24.19.0

Commits

• See full diff in compare view

Updates @modelcontextprotocol/client from 2.0.0 to 2.2.0

Release notes

Sourced from @​modelcontextprotocol/client's releases.

@​modelcontextprotocol/client@​2.2.0

Minor Changes

• #2887 edd12e2 Thanks @​maxisbey! - Constructing ClientCredentialsProvider, PrivateKeyJwtProvider, StaticPrivateKeyJwtProvider or CrossAppAccessProvider without expectedIssuer is deprecated: the constructor logs one console.warn and that call signature is marked @deprecated. Behaviour is otherwise unchanged. Pass the issuer of the authorization server the credentials were registered with.

  fetchToken() throws AuthorizationServerMismatchError, before sending anything, when the provider's client information is bound to a different authorization server than the one it is called with. The AuthorizationServerMismatchError message no longer assumes the authorization-code callback; its fields are unchanged.

  OAuthTokensSchema and OAuthClientInformationSchema accept the optional issuer stamp, so a provider that reads storage back through them keeps it. auth() overwrites it on every save.

Patch Changes

• #2885 9dd722f Thanks @​claude! - Sending a notification on a closed connection no longer produces a briefly unhandled promise rejection (seen as unhandledrejection on Cloudflare Workers) in addition to the returned rejection.

• #2883 c0f7aec Thanks @​claude! - Fix a type-check failure for CommonJS TypeScript projects introduced in 2.1.0: dist/index.d.cts imported types from jose, which is ESM-only, so tsc with module: node16/node18 and skipLibCheck: false failed with TS1479. The two jose types used by the DPoP API (CryptoKey, JWK) are now inlined into the declaration files. No runtime change.

• #2768 efebf5b Thanks @​web-abin! - Correct the JSDoc for insecure OAuth token endpoints. The TLS requirement comes from the MCP authorization specification's OAuth 2.1 communication-security rules, not SEP-2207, which covers OIDC-flavored refresh-token guidance. Documentation only; no runtime behavior change.

• #2729 a4ae2f9 Thanks @​claude! - Correct the registerClient @deprecated notice: Dynamic Client Registration was deprecated by spec PR modelcontextprotocol#2858 (Client ID Metadata Documents), not SEP-2577 (which deprecates roots, sampling, and logging). The notice now also names the earliest possible removal date under the feature lifecycle policy (2027-07-28) and clarifies that the client_id_metadata_document_supported gating lives in the built-in auth() flow — registerClient called directly always sends the registration request. Documentation only; no runtime behavior change.

• #2862 e780e13 Thanks @​SyedTashfin! - Preserve _meta on input_required results. The 2026-07-28 decode seam rebuilt the payload from inputRequests and requestState only, so result-level metadata a server sent on an input_required result (including io.modelcontextprotocol/serverInfo) was dropped before an allowInputRequired: true caller could see it. Result._meta is a result-level field, so input_required carries it exactly like any other result.

• #2886 ef39308 Thanks @​claude! - listTools(), listPrompts(), listResources() and listResourceTemplates() called without a cursor now follow nextCursor until the server stops sending one, instead of stopping silently with a short list when a cursor repeats; a page that has the same items and the same nextCursor as the page before it ends the walk and is not added twice, and listMaxPages still caps the walk.

• #2642 cfa09db Thanks @​claude! - Fix Client.listen() rejections escaping as process-level unhandled rejections. The internal opening promise could reject (ack timeout, transport close, server cancel, caller abort) while listen() was still serially awaiting transport.send(...), so no rejection handler was attached yet — the rejection surfaced as an unhandledRejection that caller-side handling cannot prevent, and a send that never settles (e.g. a stdio write parked on 'drain') left listen() suspended forever even though the ack timer had already fired. listen() now suspends on the opening state machine directly and routes send failures into it, so every termination path rejects the returned promise and nothing escapes.

• #2597 7f7a94c Thanks @​arimu1! - Treat hostnames ending in .localhost as loopback for the SEP-2207 token-endpoint https guard (RFC 6761 §6.3), so host-based multi-tenant local OAuth works. The SDK does not resolve the name itself: *.localhost reaches the local machine only if the system resolver follows RFC 6761.

• Updated dependencies [edd12e2]:

  • @​modelcontextprotocol/core@​2.2.0

@​modelcontextprotocol/client@​2.1.0

Minor Changes

• #2629 dcc0102 Thanks @​gbshankar! - Add DPoP (RFC 9449 / SEP-1932) sender-constrained access token support to the client.
  • Opt in by implementing OAuthClientProvider.dpop() returning a DpopSession (new, along with generateDpopKeyPair, accessTokenHash, isDpopNonceChallenge). auth() / exchangeAuthorization / refreshAuthorization / fetchToken then sign a DPoP proof into token requests (retrying once on an authorization-server use_dpop_nonce challenge, with client authentication re-applied per attempt), and StreamableHTTPClientTransport, SSEClientTransport and withOAuth present a token_type: "DPoP" access token as Authorization: DPoP <token> plus a fresh per-request proof, retry a resource-server use_dpop_nonce challenge once, and pick up a DPoP-Nonce delivered on any response. Tokens the AS issued as Bearer are still presented as Bearer.
  • DPoP is applied at the fetch layer: the transports wrap their resource-server fetch (including a caller-supplied fetch / eventSourceInit.fetch) with the new withDpopFromProvider(provider) middleware, so proofs are always bound to the request actually sent. withDpop(session, getToken) is exported for callers that manage tokens themselves (e.g. alongside a minimal AuthProvider); the AuthProvider interface itself is unchanged.
  • auth() now recovers from invalid_dpop_proof on refresh (e.g. a refresh token bound to a key that is no longer held) by discarding the tokens and re-authorizing, like invalid_grant. OAuthErrorCode gains InvalidDpopProof and UseDpopNonce; extractWWWAuthenticateParams recognizes the DPoP challenge scheme; OAuthMetadataSchema gains dpop_signing_alg_values_supported.

Patch Changes

• #2726 6fa4227 Thanks @​LuckTerence! - SdkError and SdkHttpError accept standard ErrorOptions as an optional fourth constructor argument and forward it to Error, so a wrapped error is reachable through the standard Error.cause chain. Version-negotiation probe failures (SdkErrorCode.EraNegotiationFailed) now use it: the underlying TypeError: fetch failed and the DNS or socket error beneath it surface via error.cause, so pino, Sentry, and util.inspect render ENOTFOUND / ECONNREFUSED / ETIMEDOUT instead of stopping at the SdkError (#2657). The previous error.data.cause slot is still populated for compatibility but is deprecated and slated for removal; read error.cause instead.

• #2654 03842cd Thanks @​pshah19! - Treat request id 0 as a real id. Two guards tested a RequestId for truthiness, so the legal JSON-RPC ids 0 and '' were read as absent. Id 0 is not a corner case: the outbound request counter is zero-based, so it is the first id every peer assigns, which on the server→client leg is the first sampling/createMessage, elicitation/create, or roots/list a server sends.

  • notifications/cancelled carrying id 0 was ignored, and the in-flight handler ran to completion with its AbortSignal never fired.
  • A notification sent with relatedRequestId: 0 wrongly passed the debounce gate (for methods opted into debouncedNotificationMethods). Because the pending set is keyed by method alone, a second such notification in the same tick was silently dropped rather than sent.

  Absent is now the only value that means "no id".

• #2043 c4248a9 Thanks @​ChrisJr404! - On Windows, stdio servers spawned by StdioClientTransport now also inherit COMSPEC, PATHEXT, PROGRAMDATA, PROGRAMFILES(X86), PROGRAMW6432, and WINDIR (added to DEFAULT_INHERITED_ENV_VARS). Programs a server launches can depend on them: PowerShell finds no native executables without PATHEXT, and Windows OpenSSH exits 255 without ProgramData.

... (truncated)

Commits

• dd22ba2 Version Packages (#2849)
• c55efa6 fix(server): close a listen stream that has honored nothing (#2651)
• edd12e2 fix(client): deprecate omitting expectedIssuer and apply the SEP-2352 issuer ...
• ef39308 fix(client): follow nextCursor until it is absent; stop on a repeated page (#...
• 9dd722f fix(core): await the notification send so a failed send is never briefly unha...
• e780e13 fix(client): preserve _meta on input_required results (#2862)
• a4ae2f9 docs(client): correct the registerClient deprecation citation to spec PR #285...
• efebf5b docs(client): correct token endpoint TLS citation (#2768)
• d992df7 chore: remove CODEOWNERS patterns that match nothing on main (#2884)
• c0f7aec fix(client): inline jose types in the CommonJS declaration file (#2883)
• Additional commits viewable in compare view

Updates @types/node from 24.13.4 to 24.19.0

Commits

• See full diff in compare view

Updates @types/node from 24.13.4 to 24.19.0

Commits

• See full diff in compare view

Updates @modelcontextprotocol/client from 2.0.0 to 2.2.0

Release notes

Sourced from @​modelcontextprotocol/client's releases.

@​modelcontextprotocol/client@​2.2.0

Minor Changes

• #2887 edd12e2 Thanks @​maxisbey! - Constructing ClientCredentialsProvider, PrivateKeyJwtProvider, StaticPrivateKeyJwtProvider or CrossAppAccessProvider without expectedIssuer is deprecated: the constructor logs one console.warn and that call signature is marked @deprecated. Behaviour is otherwise unchanged. Pass the issuer of the authorization server the credentials were registered with.

  fetchToken() throws AuthorizationServerMismatchError, before sending anything, when the provider's client information is bound to a different authorization server than the one it is called with. The AuthorizationServerMismatchError message no longer assumes the authorization-code callback; its fields are unchanged.

  OAuthTokensSchema and OAuthClientInformationSchema accept the optional issuer stamp, so a provider that reads storage back through them keeps it. auth() overwrites it on every save.

Patch Changes

• #2885 9dd722f Thanks @​claude! - Sending a notification on a closed connection no longer produces a briefly unhandled promise rejection (seen as unhandledrejection on Cloudflare Workers) in addition to the returned rejection.

• #2883 c0f7aec Thanks @​claude! - Fix a type-check failure for CommonJS TypeScript projects introduced in 2.1.0: dist/index.d.cts imported types from jose, which is ESM-only, so tsc with module: node16/node18 and skipLibCheck: false failed with TS1479. The two jose types used by the DPoP API (CryptoKey, JWK) are now inlined into the declaration files. No runtime change.

• #2768 efebf5b Thanks @​web-abin! - Correct the JSDoc for insecure OAuth token endpoints. The TLS requirement comes from the MCP authorization specification's OAuth 2.1 communication-security rules, not SEP-2207, which covers OIDC-flavored refresh-token guidance. Documentation only; no runtime behavior change.

• #2729 a4ae2f9 Thanks @​claude! - Correct the registerClient @deprecated notice: Dynamic Client Registration was deprecated by spec PR modelcontextprotocol#2858 (Client ID Metadata Documents), not SEP-2577 (which deprecates roots, sampling, and logging). The notice now also names the earliest possible removal date under the feature lifecycle policy (2027-07-28) and clarifies that the client_id_metadata_document_supported gating lives in the built-in auth() flow — registerClient called directly always sends the registration request. Documentation only; no runtime behavior change.

• #2862 e780e13 Thanks @​SyedTashfin! - Preserve _meta on input_required results. The 2026-07-28 decode seam rebuilt the payload from inputRequests and requestState only, so result-level metadata a server sent on an input_required result (including io.modelcontextprotocol/serverInfo) was dropped before an allowInputRequired: true caller could see it. Result._meta is a result-level field, so input_required carries it exactly like any other result.

• #2886 ef39308 Thanks @​claude! - listTools(), listPrompts(), listResources() and listResourceTemplates() called without a cursor now follow nextCursor until the server stops sending one, instead of stopping silently with a short list when a cursor repeats; a page that has the same items and the same nextCursor as the page before it ends the walk and is not added twice, and listMaxPages still caps the walk.

• #2642 cfa09db Thanks @​claude! - Fix Client.listen() rejections escaping as process-level unhandled rejections. The internal opening promise could reject (ack timeout, transport close, server cancel, caller abort) while listen() was still serially awaiting transport.send(...), so no rejection handler was attached yet — the rejection surfaced as an unhandledRejection that caller-side handling cannot prevent, and a send that never settles (e.g. a stdio write parked on 'drain') left listen() suspended forever even though the ack timer had already fired. listen() now suspends on the opening state machine directly and routes send failures into it, so every termination path rejects the returned promise and nothing escapes.

• #2597 7f7a94c Thanks @​arimu1! - Treat hostnames ending in .localhost as loopback for the SEP-2207 token-endpoint https guard (RFC 6761 §6.3), so host-based multi-tenant local OAuth works. The SDK does not resolve the name itself: *.localhost reaches the local machine only if the system resolver follows RFC 6761.

• Updated dependencies [edd12e2]:

  • @​modelcontextprotocol/core@​2.2.0

@​modelcontextprotocol/client@​2.1.0

Minor Changes

• #2629 dcc0102 Thanks @​gbshankar! - Add DPoP (RFC 9449 / SEP-1932) sender-constrained access token support to the client.
  • Opt in by implementing OAuthClientProvider.dpop() returning a DpopSession (new, along with generateDpopKeyPair, accessTokenHash, isDpopNonceChallenge). auth() / exchangeAuthorization / refreshAuthorization / fetchToken then sign a DPoP proof into token requests (retrying once on an authorization-server use_dpop_nonce challenge, with client authentication re-applied per attempt), and StreamableHTTPClientTransport, SSEClientTransport and withOAuth present a token_type: "DPoP" access token as Authorization: DPoP <token> plus a fresh per-request proof, retry a resource-server use_dpop_nonce challenge once, and pick up a DPoP-Nonce delivered on any response. Tokens the AS issued as Bearer are still presented as Bearer.
  • DPoP is applied at the fetch layer: the transports wrap their resource-server fetch (including a caller-supplied fetch / eventSourceInit.fetch) with the new withDpopFromProvider(provider) middleware, so proofs are always bound to the request actually sent. withDpop(session, getToken) is exported for callers that manage tokens themselves (e.g. alongside a minimal AuthProvider); the AuthProvider interface itself is unchanged.
  • auth() now recovers from invalid_dpop_proof on refresh (e.g. a refresh token bound to a key that is no longer held) by discarding the tokens and re-authorizing, like invalid_grant. OAuthErrorCode gains InvalidDpopProof and UseDpopNonce; extractWWWAuthenticateParams recognizes the DPoP challenge scheme; OAuthMetadataSchema gains dpop_signing_alg_values_supported.

Patch Changes

• #2726 6fa4227 Thanks @​LuckTerence! - SdkError and SdkHttpError accept standard ErrorOptions as an optional fourth constructor argument and forward it to Error, so a wrapped error is reachable through the standard Error.cause chain. Version-negotiation probe failures (SdkErrorCode.EraNegotiationFailed) now use it: the underlying TypeError: fetch failed and the DNS or socket error beneath it surface via error.cause, so pino, Sentry, and util.inspect render ENOTFOUND / ECONNREFUSED / ETIMEDOUT instead of stopping at the SdkError (#2657). The previous error.data.cause slot is still populated for compatibility but is deprecated and slated for removal; read error.cause instead.

• #2654 03842cd Thanks @​ps...

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