🛠️Microsoft MCP C# SDK 2.0 Released with Major Changes

Streamable HTTP Servers Go Stateless in MCP 2.0

Microsoft just dropped the MCP C# SDK 2.0, a major update that makes Streamable HTTP servers stateless by default. This change standardizes HTTP headers for routing MCP traffic and introduces Multi Round-Trip Requests (MRTR) for interactive tools. If you're building with MCP, this means your servers no longer need to maintain state for each client connection, simplifying load balancing and scaling. The new spec also deprecates older APIs and introduces stricter OAuth behavior. SDK now targets .NET 8, 9, and 10, plus .NET Standard 2.0, ensuring compatibility across a wide range of environments.