Go modules · #393 by repository stars

github.com/mark3labs/mcp-go

v1.1.1mark3labs/mcp-go ↗New releases in your daily digest, changelog included.

Last release 15 days ago
23 Sep 2026
Ships on a steady schedule
a new release about every 2 weeks
Rarely documented
notes for 11 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
2 years old
298 releases · first in 2024

Release timeline

298 releases since 2024

202420252026

20242026

One column per month.

Releases

v1.1.123 Sept 2026
v1.1.1 - Bug fixes for stdio concurrency, pagination, tasks and resou…
v1.1.1 - Bug fixes for stdio concurrency, pagination, tasks and resou…

…rces

Fixes:
- mcp: accept empty text and blob resource contents (#952)
- mcp: read the tasks/result payload from the top level (#973)
- stdio: serve requests off the read loop so slow handlers no longer block reads (#977)
- client: reset pagination cursors for each iterator traversal (#985)
- server: validate x-mcp-header annotations on every tool registration path (#986)
Open source →
v1.1.015 Sept 2026
v1.1.0 - In-process client options, roots handler support, and transp…
v1.1.0 - In-process client options, roots handler support, and transp…

…ort fixes

Features:
- client: NewInProcessClientWithOptions configures sampling, elicitation, and
roots handlers together on the in-process transport (#953)
- mcptest: SetRootsHandler registers a roots/list handler for tools under test (#955)
- mcp: tool schema property order is preserved through decode and encode (#984)

Fixes:
- mcp: decode the result envelope in the prompts/get and resources/read parsers (#971)
- server: cancel task execution on TTL expiration (#982)
- transport: skip unsupported SIGTERM on Windows stdio Close (#978)
- transport: reject SSE restart after close and close the Start/Close race (#968)

v1.0.02 Sept 2026

feat(mcp,server,client): support the 2026-07-28 specification by @ezynda3 in #951

What's Changed

feat(mcp,server,client): support the 2026-07-28 specification by @ezynda3 in #951
fix: report correct item index in RequireIntSlice conversion error by @serhiizghama in #958
fix(transport): prevent SSE client panics on duplicate endpoint and concurrent close by @GerardGao in #964
fix(mcp): carry _meta on ResourceLink content by @serhiizghama in #965
fix(transport): drain stdio subprocess stderr to avoid pipe-full deadlock by @GerardGao in #963
chore(server): move httptest helpers to server/servertest by @SamuelMolero26 in #966
fix: don't fire connection-lost handler on intentional SSE close by @serhiizghama in #962
feat(client): add context-aware task polling helper by @Whxuan0701 in #954

New Contributors

@serhiizghama made their first contribution in #958
@GerardGao made their first contribution in #964
@SamuelMolero26 made their first contribution in #966
@Whxuan0701 made their first contribution in #954

Full Changelog: v0.58.0...v1.0.0

Open source →

v1.0.0-beta.112 Aug 2026pre-release

feat(mcp,server,client): support the 2026-07-28 specification by @ezynda3 in #951

What's Changed

feat(mcp,server,client): support the 2026-07-28 specification by @ezynda3 in #951

Full Changelog: v0.58.0...v1.0.0-beta.1

Open source →

v0.58.011 Aug 2026

fix(server): return 200 for HEAD requests instead of 404 by @suxiaohun in #937

What's Changed

fix(server): return 200 for HEAD requests instead of 404 by @suxiaohun in #937
[mcp] document exported helper functions by @zbarsky-openai in #940
fix(server): deliver request-scoped elicitation on the originating POST SSE stream by @Yusufihsangorgel in #933
docs: bump CONTRIBUTING Go prerequisite to match go.mod (1.23 → 1.25) by @kobihikri in #929
fix: rewrite draft-07 definitions refs when adopting them as $defs by @WilliamAGH in #950
fix(server): flush final SSE response in handlePost by @vinayaksachdeva in #945
Fix #943: refuse unsupported subscribe requests by @Abdullah-Builds in #946
fix(mcp): preserve schema tags on nested fields by @ychampion in #920

New Contributors

@zbarsky-openai made their first contribution in #940
@kobihikri made their first contribution in #929
@WilliamAGH made their first contribution in #950
@vinayaksachdeva made their first contribution in #945
@Abdullah-Builds made their first contribution in #946
@ychampion made their first contribution in #920

Full Changelog: v0.57.0...v0.58.0

Open source →

v0.57.1-0.20260729154337-d7c7b06e4d2529 Jul 2026pre-release

Nothing published for this version

v0.57.1-0.20260729093534-4ff6c3bba7a829 Jul 2026pre-release

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v0.57.023 Jul 2026

fix(client): make initialized state atomic by @MitulShah1 in #936

What's Changed

fix(client): make initialized state atomic by @MitulShah1 in #936
fix(mcp): support jsonschema_description and enum struct tags by @syf2211 in #931
fix(streamable_http): close active sessions before Shutdown by @syf2211 in #926
fix(client): accept Content-Type parameters on GET listening stream by @Yusufihsangorgel in #925
fix(server): label client JSON-RPC errors by method in streamable HTTP by @zent7x in #924
fix(mcp): unmarshal embedded resource contents by @jstar0 in #938
feat(server): add streamable HTTP stream resumability via pluggable EventStore by @Abhinav2408 in #930
docs(examples): fix stale struct tags in structured I/O example by @zent7x in #923
fix(transport): concatenate multi-line SSE data fields instead of overwriting by @Yusufihsangorgel in #927
fix: deliver server notifications to in-process transport clients by @jgangemi in #919

New Contributors

@MitulShah1 made their first contribution in #936
@Yusufihsangorgel made their first contribution in #925
@zent7x made their first contribution in #924
@jgangemi made their first contribution in #919

Full Changelog: v0.56.0...v0.57.0

Open source →

v0.56.08 Jul 2026

feat(server): add automatic DNS rebinding protection for localhost by @ezynda3 in #921

What's Changed

feat(server): add automatic DNS rebinding protection for localhost by @ezynda3 in #921
fix(tools): preserve raw JSON for tool arguments and structuredContent by @syf2211 in #916
fix(server): render readable ErrorKind labels in validation messages by @syf2211 in #915

Full Changelog: v0.55.1...v0.56.0

Open source →

v0.55.2-0.20260708134414-f6f3485b3bc18 Jul 2026pre-release

Nothing published for this version

v0.55.125 Jun 2026

fix: avoid full filter scans on call hot paths by @jstar0 in #908

What's Changed

fix: avoid full filter scans on call hot paths by @jstar0 in #908
fix(client): avoid forwarding inbound request headers by @Zhang-986 in #909

New Contributors

@Zhang-986 made their first contribution in #909

Full Changelog: v0.55.0...v0.55.1

Open source →

v0.55.016 Jun 2026

fix: enforce tool/prompt filters at call time, not just list time by @Praiseson6065 in #898

What's Changed

fix: enforce tool/prompt filters at call time, not just list time by @Praiseson6065 in #898
feat(tracing): add MetaPropagator for W3C trace context via MCP _meta (SEP-414) by @QuentinBisson in #895
feat(server): WithLogger consolidates structured logging onto *slog.Logger by @QuentinBisson in #892
feat(otel): WithServerLogging — OTEL slog bridge for server structured logs by @QuentinBisson in #901
mcptest: add SetSamplingHandler and SetElicitationHandler by @basilalshukaili in #902
oauth: return error instead of (nil, nil) from getServerMetadata (#903) by @pjdurden in #904

New Contributors

@Praiseson6065 made their first contribution in #898
@basilalshukaili made their first contribution in #902
@pjdurden made their first contribution in #904

Full Changelog: v0.54.1...v0.55.0

Open source →

v0.54.2-0.20260604110528-d972f3fe17a04 Jun 2026pre-release

Nothing published for this version

v0.54.2-0.20260602144213-d5c0727c06ac2 Jun 2026pre-release

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v0.54.2-0.20260602090041-3f1c760f6d6a2 Jun 2026pre-release

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v0.54.122 May 2026

fix(server): handle resources/subscribe and resources/unsubscribe ( #865 ) by @ezynda3 in #873

What's Changed

fix(server): handle resources/subscribe and resources/unsubscribe (#865) by @ezynda3 in #873
fix(oauth): use LATEST_PROTOCOL_VERSION in metadata discovery (#868) by @ezynda3 in #874
fix(oauth): don't hold metadataMu across HTTP discovery (#871) by @ezynda3 in #875
feat(mcp): add 2025-11-25 sampling-with-tools and capability sub-fields (#867) by @ezynda3 in #876
refactor: use MCP method constants by @nanookclaw in #878
docs: add missing godoc comments by @aqilaziz in #877
fix: add panic recovery to SSE message handler and stdio tool call worker by @blackwell-systems in #882
fix: add panic recovery to task goroutines, fix cleanup goroutine leak by @blackwell-systems in #880
feat: add OpenTelemetry tracing hooks to server and client by @QuentinBisson in #856
fix: add panic recovery to session hook goroutines by @blackwell-systems in #883
feat(mcp): add BaseMetadata.title, Icon.theme, Resource.size (#870) by @ezynda3 in #885
refactor(server): collapse client-info and writeJSONRPCError duplication by @ezynda3 in #886
Add Title and Size to ResourceLink (match Resource / spec) by @gerami-ant in #887
perf(mcp): reduce content unmarshal allocations by @dhimasardinata in #890
fix(tools): print errors to stderr for invalid jsonschema tags by @jasonl4 in #894

New Contributors

@nanookclaw made their first contribution in #878
@aqilaziz made their first contribution in #877
@gerami-ant made their first contribution in #887
@dhimasardinata made their first contribution in #890
@jasonl4 made their first contribution in #894

Full Changelog: v0.53.0...v0.54.1

Open source →

v0.54.1-0.20260522082900-481f05674f5822 May 2026pre-release

Nothing published for this version

v0.54.1-0.20260519091629-6e7859cbd25d19 May 2026pre-release

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v0.54.1-0.20260515112047-ca267385245e15 May 2026pre-release

Nothing published for this version

v0.54.013 May 2026

fix(server): handle resources/subscribe and resources/unsubscribe ( #865 ) by @ezynda3 in #873

What's Changed

fix(server): handle resources/subscribe and resources/unsubscribe (#865) by @ezynda3 in #873
fix(oauth): use LATEST_PROTOCOL_VERSION in metadata discovery (#868) by @ezynda3 in #874
fix(oauth): don't hold metadataMu across HTTP discovery (#871) by @ezynda3 in #875
feat(mcp): add 2025-11-25 sampling-with-tools and capability sub-fields (#867) by @ezynda3 in #876
refactor: use MCP method constants by @nanookclaw in #878
docs: add missing godoc comments by @aqilaziz in #877
fix: add panic recovery to SSE message handler and stdio tool call worker by @blackwell-systems in #882
fix: add panic recovery to task goroutines, fix cleanup goroutine leak by @blackwell-systems in #880
feat: add OpenTelemetry tracing hooks to server and client by @QuentinBisson in #856
fix: add panic recovery to session hook goroutines by @blackwell-systems in #883
feat(mcp): add BaseMetadata.title, Icon.theme, Resource.size (#870) by @ezynda3 in #885

New Contributors

@nanookclaw made their first contribution in #878
@aqilaziz made their first contribution in #877

Full Changelog: v0.53.0...v0.54.0

Open source →

v0.53.012 May 2026

feat(server): add WithStrictInputSchemaDefault by @QuentinBisson in #853

What's Changed

feat(server): add WithStrictInputSchemaDefault by @QuentinBisson in #853
fix(server): add CloseSessions and prevent double-close panic on SSE sessions by @blackwell-systems in #852
fix(transport): suppress closed-pipe shutdown noise by @Gujiassh in #863
fix: add panic recovery to transport goroutines by @blackwell-systems in #861
fix: ToolInputSchema inherits MarshalJSON (fixes #694) by @tamish-max in #858
we should use pointers on returns for ListPrompts and ListResources by @Patryk-Stefanski in #855
fix(mcp): allow _meta on paginated requests by @curbol in #854
refactor(server): use explicit struct literal in ListTools by @ezynda3 in #864

New Contributors

@QuentinBisson made their first contribution in #853
@tamish-max made their first contribution in #858
@curbol made their first contribution in #854

Full Changelog: v0.52.0...v0.53.0

Open source →

v0.52.1-0.20260507074743-f901ca7c8bc07 May 2026pre-release

Nothing published for this version

v0.52.05 May 2026

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v0.51.04 May 2026

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v0.50.030 Apr 2026

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v0.49.021 Apr 2026

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v0.48.1-0.20260421141102-092e9be7147121 Apr 2026pre-release

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v0.48.1-0.20260415094614-dee98dd7d96915 Apr 2026pre-release

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v0.48.014 Apr 2026

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v0.47.2-0.20260413150537-465f3a18291613 Apr 2026pre-release

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v0.47.18 Apr 2026

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v0.47.1-0.20260406201644-9a96404d1f666 Apr 2026pre-release

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v0.47.04 Apr 2026

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v0.46.1-0.20260331095209-d52df1ae34f131 Mar 2026pre-release

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v0.46.1-0.20260326081404-4713d74e5b4626 Mar 2026pre-release

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v0.46.026 Mar 2026

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v0.45.1-0.20260324124936-4fa4dbffbfa624 Mar 2026pre-release

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v0.45.1-0.20260315091451-4dd76c65f77415 Mar 2026pre-release

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v0.45.1-0.20260311014745-17fcb81c69bf11 Mar 2026pre-release

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v0.45.1-0.20260309073845-c70aadc0bb919 Mar 2026pre-release

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v0.45.06 Mar 2026

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v0.44.2-0.20260304164122-38c90481b9734 Mar 2026pre-release

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v0.44.127 Feb 2026

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v0.44.015 Feb 2026

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v0.44.0-beta.3.0.20260211083836-859588d9c5ac11 Feb 2026pre-release

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v0.44.0-beta.34 Feb 2026pre-release

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v0.44.0-beta.2.0.20260129101431-45740a01703129 Jan 2026pre-release

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v0.44.0-beta.2.0.20260112205925-c49488d088e112 Jan 2026pre-release

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v0.44.0-beta.29 Jan 2026pre-release

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v0.44.0-beta.1.0.20260107165142-b02859a2db697 Jan 2026pre-release

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v0.44.0-beta.1.0.20260106105434-74f5edbe8dfb6 Jan 2026pre-release

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v0.44.0-beta.1.0.20260105111821-a1b6997453ff5 Jan 2026pre-release

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v0.44.0-beta.1.0.20260105102601-0523523889d55 Jan 2026pre-release

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v0.44.0-beta.1.0.20251231180242-a2e00ab0248031 Dec 2025pre-release

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v0.44.0-beta.1.0.20251223124111-498341ae4ebb23 Dec 2025pre-release

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v0.44.0-beta.1.0.20251222081419-1e5bacc4523222 Dec 2025pre-release

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v0.44.0-beta.119 Dec 2025pre-release

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v0.43.3-0.20251219103557-1db477e349c719 Dec 2025pre-release

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v0.43.3-0.20251211134832-919c4bf6a58b11 Dec 2025pre-release

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v0.43.228 Nov 2025

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