Model Context Protocol official C# SDK released, co-maintained with Microsoft
Decision Brief
What changedThe official C# SDK for Model Context Protocol is released, co-maintained with Microsoft, supporting .NET apps in building MCP clients and servers.
Why it matters.NET developers can now implement MCP clients and servers directly with the official C# SDK, and the split into multiple NuGet packages allows more flexible dependency control.
Who should careAI coding tool users, Agent builders
Affected stackMCP
Builder actionUpdate MCP to the latest version
Source confidenceHigh · Official release / blog / repo
The official C# SDK for Model Context Protocol is released on GitHub, co-maintained with Microsoft. The SDK provides several NuGet packages: ModelContextProtocol.Core for cases needing only client or low-level server APIs with minimal dependencies; ModelContextProtocol with hosting and dependency injection extensions, suitable for most projects; ModelContextProtocol.AspNetCore for HTTP-based MCP servers; plus two extension packages for building interactive UI apps and running long-running tool calls asynchronously. The SDK supports the Identity Assertion Authorization Grant flow via IdentityAssertionGrantProvider for cross-app access.
Summary basis: full article readCompiled from the source scope noted above; the original remains authoritative.
Sources
- Skill Radar（GitHub 趋势）
Trending hands-on MCP servers, agent skills, and AI-coding tools discovered from GitHub search momentum.
- GitHub：modelcontextprotocol/csharp-sdk
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