Microsoft’s official C# SDK for implementing Model Context Protocol (MCP) servers and shoppers has reached its 1.zero milestone launch. The replace brings full help for the 2025-11-25 model of the MCP Specification, highlighted by enhanced authorization server discovery and icon metadata for instruments, sources, and prompts.
MCP C# SDK 1.zero was unveiled March 5 and could be discovered on GitHub. The MCP C# SDK 1.zero launch represents a significant step ahead for constructing MCP servers and shoppers in .NET, based on Microsoft. Developers can use the SDK to implement safe authorization flows, construct wealthy device experiences with sampling, or deal with long-running operations, the corporate mentioned.
With authorization server discovery within the 2025-11-25 MCP specification, servers have 3 ways to show the Protected Resource Metadata (PRM) doc: by way of a “well-known” URL derived from the server’s MCP endpoint path, on the root well-known URL, and, as earlier than, by way of a URL within the useful resource metadata parameter of the WWW-Authentication header.
