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Microsoft has released MCP C# SDK v2.0, implementing the Model Context Protocol Specification 2026-07-28. The major changes include a shift from session-based to stateless-first architecture, support for Multi Round-Trip Requests (MRR) enabling iterative AI workflows, and standardized HTTP headers for better interoperability. The release introduces breaking API changes, so existing applications will require migration work. The update benefits .NET developers building AI agents, MCP servers, and clients, improving scalability for cloud-native deployments on Kubernetes, Azure, and containers.

Microsoft Releases MCP C# SDK v2.0 for .NET

Microsoft Brings the Official MCP C# SDK to Version 2.0

Breaking API changes are mentioned but never listed. Is there a migration doc for the v1 to v2 jump, or is diffing the source the plan?

a doc would be nice or breaking changes

The move from session-based to stateless-first is the detail I’d test first, because stateless is easier to scale but it pushes all the context-carrying onto each request and that changes how you budget tokens. Multi Round-Trip Requests are interesting too, since they let a tool negotiate mid-call instead of failing and retrying. Has anyone benchmarked whether stateless-first actually cuts server memory in practice, or does the bigger per-request payload eat the savings?