Issue on Updating to Preview 7

[taimurlak]

Pre-submission Checklist

• I have checked that this question would not be more appropriate as an issue in a specific repository
• I have searched existing discussions and documentation for answers

Question Category

• Protocol Specification
• SDK Usage
• Server Implementation
• General Implementation
• Documentation
• Other

Your Question

I'm encountering an error after updating the NuGet package to Preview 7:

I'm unsure if this is a NuGet/package issue or if I'm making a mistake on my end.

• Here's my setup:
• I'm using .NET 8
• For the MCP Server, I'm using ModelContextProtocol.AspNetCore, and it's working fine.

For the MCP Client, I tried updating to the latest preview version by first removing the existing package and then running dotnet add package ModelContextProtocol --prerelease After doing this and updating to Preview 7, I started getting the error shown in the screenshot.

Has something changed in Preview 7 that requires a different setup for the client? Or am I missing something in the upgrade process?