v0.1.0-preview.14

This release consolidates namespaces across the SDK, adds stateless Streamable HTTP support, improves exception diagnostics for stdio transports, and fixes resource registration. It includes several breaking changes to namespaces, factory method signatures, and transport APIs.

Breaking Changes

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

1. Namespace consolidation #410

   • ModelContextProtocol.Protocol.Messages, ModelContextProtocol.Protocol.Types, and ModelContextProtocol.Protocol.Transport consolidated into ModelContextProtocol.Protocol
   • ModelContextProtocol.Utils and ModelContextProtocol.Utils.Json consolidated into ModelContextProtocol and ModelContextProtocol.Protocol
   • ModelContextProtocol.Shared and ModelContextProtocol.Hosting removed
   • Update using directives to the new namespaces

2. Factory method parameter change #412

   • McpServerTool.Create, McpServerPrompt.Create, and McpServerResource.Create overloads changed from Type parameter to Func<RequestContext<T>, object> factory delegate
   • Code calling these Create methods with a Type argument must provide a factory function instead

3. Transport API changes #376

   • TransportBase.SetConnected(bool) replaced by SetConnected() and SetDisconnected(Exception?)
   • CleanupAsync(CancellationToken) signature changed to CleanupAsync(Exception?, CancellationToken) on StreamClientSessionTransport
   • Several InvalidOperationException changed to IOException in transport error paths
   • Custom transport implementations extending TransportBase must update to the new protected API

4. Parameter rename in WithResources #411

   • WithResources parameter renamed from resourcetemplates to resourceTemplates
   • Code using named arguments must update to the new parameter name

What's Changed

• Update M.E.AI.Abstractions to 9.5.0-preview.1.25262.9 #412 by @stephentoub
• Add stateless Streamable HTTP support #392 by @halter73
• Fix McpServerResource registration #411 by @stephentoub
• Improve exception diagnostics for stdio client #376 by @stephentoub
• Clean up namespaces #410 by @stephentoub

Documentation Updates

• Make small corrections to release process docs #402 by @jeffhandley

Repository Infrastructure Updates

• Bump next version to preview.14 #403 by @jeffhandley

Acknowledgements

• @AArnott submitted issue #362 (resolved by #376)
• @ferosekhanj submitted issue #408 (resolved by #411)
• @eiriktsarpalis reviewed pull requests

Full Changelog: v0.1.0-preview.13...v0.1.0-preview.14