1.8.0

What's Changed

• Improve transport in SSE server example by @samuelcolvin in #197
• Add cross spawn and the test for it by @zhibisora in #198
  • This should improve launching stdio servers on Windows as subprocesses

New Contributors

• @samuelcolvin made their first contribution in #197
• @zhibisora made their first contribution in #198

Full Changelog: 1.7.0...1.8.0

1.7.0

What's Changed

• Add sessionID to RequestHandlerExtra type for tool invocations so multi-user services can distinguish users by @jwvictor in #158

New Contributors

• @jwvictor made their first contribution in #158

Full Changelog: 1.6.1...1.7.0

1.6.1

What's Changed

• Add timeout reset on progress notifications by @Ozamatash in #152
• Misc fixes in auth by @jerome3o-anthropic in #157
• Add CLAUDE.md with SDK development guide by @ashwin-ant in #163

New Contributors

• @Ozamatash made their first contribution in #152

Full Changelog: 1.6.0...1.6.1

1.6.0

First release containing auth

This this the first release containing support for the draft auth proposal. These features are still WIP - so be warned there might be breaking changes in the future.

What's Changed

• Client implementation of MCP auth by @jspahrsummers in #144
• Update esbuild to resolve security advisory by @jspahrsummers in #154
• fix: drop unresolved union members in zod schemas by @disintegrator in #150
• Server implementation of MCP auth by @jspahrsummers in #151

New Contributors

• @disintegrator made their first contribution in #150

Full Changelog: 1.5.0...1.6.0

1.5.0

What's Changed

• Update README.md new SSE Server to match defaults in inspector by @ihrpr in #140
• Update README.md about client.callTool by @funwarioisii in #141
• add cwd to StdioServerParameters by @sestinj in #146

New Contributors

• @ihrpr made their first contribution in #140
• @funwarioisii made their first contribution in #141
• @sestinj made their first contribution in #146

Full Changelog: 1.4.1...1.5.0

1.4.1

What's Changed

• Improve SSE error code reporting by @jspahrsummers in #137

Full Changelog: 1.4.0...1.4.1

1.4.0

What's Changed

• Add instructions for starting the server transport by @jspahrsummers in #132
• More README improvements by @jspahrsummers in #136
• feat: add mcp client instruction support by @kalvinnchau in #133
• Use eventsource package, to permit custom headers for SSE by @jspahrsummers in #134

Full Changelog: 1.3.2...1.4.0

1.3.2

What's Changed

• Fix attempted double registration of completion handlers by @jspahrsummers in #131

Full Changelog: 1.3.1...1.3.2

1.3.1

What's Changed

• Fix README examples not using ResourceTemplate class by @jspahrsummers in #125
• Fix registering multiple tools/resources/prompts by @jspahrsummers in #126

Full Changelog: 1.3.0...1.3.1

1.3.0

What's Changed

This release introduces a simplified, Express-like API, similar in spirit to the FastMCP API of the Python SDK, but adapted to the conventions of the JavaScript ecosystem.

The simplified API should make it easier to develop and iterate on MCP servers, as tools and resources are now easier to declare incrementally. See the quick start in the README for more information.

Full Changelog: 1.2.0...1.3.0