[dependabot]

Bumps the go-minor-and-patch group with 3 updates in the / directory: github.com/mattn/go-runewidth, github.com/modelcontextprotocol/go-sdk and golang.org/x/sys.

Updates github.com/mattn/go-runewidth from 0.0.19 to 0.0.31

Commits

• 466251b Merge pull request #118 from mattn/more-format-controls
• 180bd26 Treat the remaining invisible format controls as zero width
• cffa69d Merge pull request #117 from abo3losh1/fix/nonprint-format-chars
• 4b4e798 Treat bidi isolates and other invisible format characters as zero width
• 8445f99 Merge pull request #116 from mattn/latin-letters-narrow
• f46a7b3 Update the East Asian width totals in the benchmarks
• a3ce759 Measure ambiguous Latin letters as one cell in East Asian locales
• d74f63e Merge pull request #115 from mattn/hegel-fixes
• ea10d6a Cap only the part of a cluster that is drawn as one glyph
• 471864b Measure an incomplete UTF-8 sequence at the end of the text
• Additional commits viewable in compare view

Updates github.com/modelcontextprotocol/go-sdk from 1.3.1 to 1.8.0

Release notes

Sourced from github.com/modelcontextprotocol/go-sdk's releases.

v1.8.0

This release is equivalent to v1.8.0-pre.2. Thank you to those who tested the pre-release.

In this release we introduce several fixes and improvements on top of v1.7.0. It adds no new protocol revision: the supported set is unchanged, and 2026-07-28 remains the newest version the SDK negotiates.

The bulk of the work is hardening the transports against resource exhaustion, closing session leaks, deadlocks and teardown hangs found by users running the new protocol at scale, and giving servers explicit control over which protocol versions they advertise.

Two behavior changes are guarded by new MCPGODEBUG flags; see the section below.

Hardening against resource exhaustion

Every decoding path that buffers incoming input is now bounded. JSON payloads are rejected past 1000 levels of nesting, before the parser recurses. Both SSE readers cap the bytes buffered for a single event via MaxEventSize on SSEClientTransport and StreamableClientTransport, and the stdio transport caps a single JSON-RPC frame via StdioTransport.MaxLineLength.

On the OAuth side, dynamic client registration responses are bounded to 1 MB, and the discovery code now validates metadata documents rather than trusting them.

• internal/json: json nesting depth check by @​yarolegovich (#1200)
• mcp: add an sse event size cap by @​yarolegovich (#1205)
• mcp: add a max request body size of the old transport by @​yarolegovich (#1224)
• oauthex: bound dcr read to 1mb by @​yarolegovich (#1206)
• oauthex: oauth discovery checks by @​yarolegovich (#1220)

Restricting the protocol versions a server supports

ServerOptions.SupportedProtocolVersions lets a server narrow the set of versions it advertises and negotiates. The list can only narrow, never widen; naming a version the SDK does not implement panics at construction. Relatedly, a stateful streamable handler receiving a 2026-07-28 request now returns that same JSON-RPC error instead of a plain-text 400, so the client can renegotiate down instead of losing the connection.

• mcp: allow restricting the protocol versions a server supports by @​guglielmo-san (#1199)
• mcp: return json-rpc error on stateful server serving protocolVersion20260728 requests by @​guglielmo-san (#1143)
• mcp: limit SSE discover supportedVersions to SSE-defined revisions by @​arimu1 (#1121)
• mcp: prefer the negotiated protocol version over the request context by @​gwyszynski-sa (#1163)
• mcp: export ClientSessionOptions.ProtocolVersion by @​arimu1 (#1127)

Per-request cache control

ServerOptions.SetCacheable is a new hook that decides the ttlMs and cacheScope fields of every result carrying them: server/discover, the four list methods, and resources/read. It runs once per result, after the handler returns, with the values that handler produced, so it can set a policy globally while still letting an individual handler override it. Anything left unset falls back to the protocol default of public.

• mcp: allow per request Cacheable customization by @​guglielmo-san (#1203)

Behavior changes guarded by MCPGODEBUG

Two new escape-hatch flags restore the previous behavior of the changes above. Both will be removed in v1.9.0.

• plaintextstatefulrejection=1 — restore the plain-text http.Error 400 body a stateful StreamableHTTPHandler previously returned for a request carrying per-request metadata. The default is now a JSON-RPC -32022 CodeUnsupportedProtocolVersion error with an UnsupportedProtocolVersionData payload advertising the legacy versions the server supports. Introduced by #1143.
• blockingcancelnotify=1 — restore the previous behavior where a cancelled call waits synchronously for notifications/cancelled to be delivered (up to 5s) before returning, joining any delivery error into the caller's error. The default now retires the call immediately and sends the notification asynchronously. Introduced by #1151.

Options below were removed, according to plan:

• seterroroverwrite
• enableoriginverification
• disablecontenttypecheck

... (truncated)

Commits

• 3f3b699 refactor: remove legacy MCPGODEBUG compatibility for new protocol release (#1...
• 830f0b7 mcp: update conformance tests (#1231)
• 12cbafe oauthex: oauth discovery checks (#1220)
• 3632967 mcp: add an sse event size cap (#1205)
• 0d3036f mcp: allow per request Cacheable customization (#1203)
• cb0de64 mcp: add a max request body size of the old transport (#1224)
• 2fdabde mcp: do not check metatada on notifications (#1215)
• 59185e6 build(deps): bump ossf/scorecard-action from 2.4.3 to 2.4.4 (#1217)
• a6764cf build(deps): bump golang/govulncheck-action from 1.0.4 to 1.1.0 (#1218)
• 8227246 fix: only subscribe when server advertises capability (#1221)
• Additional commits viewable in compare view

Updates golang.org/x/sys from 0.38.0 to 0.41.0

Commits

• fc646e4 cpu: use IsProcessorFeaturePresent to calculate ARM64 on windows
• f11c7bb windows: add IsProcessorFeaturePresent and processor feature consts
• d25a7aa unix: add IoctlSetString on all platforms
• 6fb913b unix: return early on error in Recvmsg
• 2f44229 sys/cpu: add symbolic constants for remaining cpuid bits
• e5770d2 sys/cpu: use symbolic names for masks
• 714a44c sys/cpu: modify x86 port to match what internal/cpu does
• 08e5482 unix: fix out of bounds memory access in tests
• 4f4f1c6 Revert "cpu: add HPDS, LOR, PAN detection for arm64"
• ca63116 unix: add IOCTL_MEI_* constants
• Additional commits viewable in compare view