This is the first stable release of the ModelContextProtocol C# SDK. Thank you to all of the contributors who helped us achieve this milestone!

Breaking Changes

Refer to the C# SDK Versioning documentation for details on versioning and breaking change policies.

1. Mark RunSessionHandler experimental (MCPEXP002) #1383
   • HttpServerTransportOptions.RunSessionHandler is now annotated with [Experimental("MCPEXP002")]
   • Code that references RunSessionHandler will produce a compile-time warning (or error with TreatWarningsAsErrors); suppress with #pragma warning disable MCPEXP002
   • Consider using ConfigureSessionOptions as an alternative; RunSessionHandler may be removed or change signatures in a future release

What's Changed

• Add 2025-03-26 OAuth backward compatibility for client conformance #1374 by @jeffhandley (co-authored by @Copilot)
• Mark RunSessionHandler experimental (MCPEXP002) #1383 by @halter73 (co-authored by @Copilot @jeffhandley)

Documentation Updates

• Fix a few bugs in the docs #1379 by @stephentoub
• Add and augment conceptual docs #1375 by @jeffhandley (co-authored by @Copilot @mikekistler @stephentoub @halter73)

Repository Infrastructure Updates

• Bump to version 1.0.0 (stable) #1384 by @jeffhandley

Acknowledgements

• @halter73 @stephentoub @mikekistler @eiriktsarpalis reviewed pull requests

Full Changelog: v1.0.0-rc.1...v1.0.0