Microsoft Launches MCP C# SDK v1.0, Bringing Full Support for Latest Protocol Specification (opens in new tab)

Microsoft has released version 1.0 of the official MCP C# SDK, bringing full support for the 2025-11-25 MCP Specification. The release introduces enhanced authorization flows, icon support for tools and resources, incremental scope consent, URL mode elicitation, tool calling in sampling, and improved handling of long-running HTTP requests.