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This release is equivalent to v1.3.0-pre.1. Thank you to those who tested the pre-release.

This release includes several enhancements and bugfixes. Worth mentioning is the addition of schema caching, which significantly improves the performance in some stateless server deployment scenarios.

Dependency updates

go.mod: upgrade to jsonschema v0.4.2 by @jba in https://github.com/modelcontextprotocol/go-sdk/pull/732

Enhancements

perf: add schema caching to avoid repeated reflection by @SamMorrowDrums in https://github.com/modelcontextprotocol/go-sdk/pull/685
mcp: add DisableListening option to StreamableClientTransport by @zxxf18 in https://github.com/modelcontextprotocol/go-sdk/pull/729
feat: deprecated logger in client & add Logger in ClientOption by @CocaineCong in https://github.com/modelcontextprotocol/go-sdk/pull/738
feat: deleted the old logger in client by @CocaineCong in https://github.com/modelcontextprotocol/go-sdk/pull/744
Export GetError and SetError methods by @jba in https://github.com/modelcontextprotocol/go-sdk/pull/753

Bugfixes

fix: connectStandaloneSSE checking Content-Type header by @liushuangls in https://github.com/modelcontextprotocol/go-sdk/pull/736
mcp: fix SSEClientTransport to report HTTP errors properly by @hassan123789 in https://github.com/modelcontextprotocol/go-sdk/pull/740
mcp: add Allow header to 405 responses per RFC 9110 §15.5.6 by @SamMorrowDrums in https://github.com/modelcontextprotocol/go-sdk/pull/757
mcp: fix a race condition in logging by @maciej-kisiel in https://github.com/modelcontextprotocol/go-sdk/pull/761

Chores

docs: adds SDK version support matrix by @La002 in https://github.com/modelcontextprotocol/go-sdk/pull/737
.github/workflows: add nightly conformance tests by @findleyr in https://github.com/modelcontextprotocol/go-sdk/pull/752

New Contributors

@La002 made their first contribution in https://github.com/modelcontextprotocol/go-sdk/pull/737
@hassan123789 made their first contribution in https://github.com/modelcontextprotocol/go-sdk/pull/740
@liushuangls made their first contribution in https://github.com/modelcontextprotocol/go-sdk/pull/736
@CocaineCong made their first contribution in https://github.com/modelcontextprotocol/go-sdk/pull/738
@zxxf18 made their first contribution in https://github.com/modelcontextprotocol/go-sdk/pull/729
@SamMorrowDrums made their first contribution in https://github.com/modelcontextprotocol/go-sdk/pull/685
@maciej-kisiel made their first contribution in https://github.com/modelcontextprotocol/go-sdk/pull/761

Full Changelog: https://github.com/modelcontextprotocol/go-sdk/compare/v1.2.0...v1.3.0