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MCP C# SDK v1.0 Released: Authorization Discovery, Tool Sampling, Async Requests for .NET Agents
The Model Context Protocol C# SDK reached v1.0 on March 5, 2026, adding authorization server discovery, Client ID Metadata Documents, tool sampling, and long-running async request support — bringing .NET to feature parity with the Python and TypeScript SDKs. This matters because enterprise .NET shops (banking, healthcare, insurance) previously had no production-grade MCP path; v1.0 removes that blocker. TypeScript SDK v1.27.1 and Python SDK v1.26 also shipped recent updates, and OpenAI's Agents SDK added MCP retry and error normalization in v0.12.5.
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