Release v0.3.0-preview.1 · modelcontextprotocol/csharp-sdk

What's Changed

Remove incorrect acknowledgement from README of new Core package by @halter73 in #482
Add context to complete requests by @stephentoub in #488
Add structured output/output schema support for server-side tools. by @eiriktsarpalis in #480
Pass session id's to MCP endpoints. by @eiriktsarpalis in #466
Make enums serialize as strings if using the reflection-based serializer. by @eiriktsarpalis in #473
Update Microsoft.Extensions.AI version & expose JSON configuration on McpServerResourceCreateOptions by @sbomer in #511
Update content according to latest spec by @stephentoub in #513
Fix visibility of polyfill by @stephentoub in #523
Add a callback for receiving stderr output by @stephentoub in #525
Send MCP-Protocol-Version header in Streamable HTTP client transport by @halter73 in #500
Send DELETE request when closing a Streamable HTTP session on the client by @halter73 in #501
Fix QuickstartClient path by @stephentoub in #528
Add 2025-06-18 as supported version by @stephentoub in #529
Bump version number to 0.3.0 by @eiriktsarpalis in #534

Full Changelog: v0.2.0-preview.3...v0.3.0-preview.1