The MCP C# SDK has introduced a hybrid session mode to accommodate both older and newer client versions on a single endpoint. This new feature, HttpServerSessionMode.StatefulForInitializeClients, allows clients using the 2025 initialization handshake to maintain sessions while simultaneously supporting stateless requests from clients adhering to the 2026 protocol. This configuration prevents the need for clients to downgrade or for servers to strip functionality, ensuring a smoother upgrade path. AI
IMPACT Enables smoother integration and upgrades for applications using the MCP C# SDK.
RANK_REASON The item describes a new feature for a software development kit, not a core AI release or significant industry event.
- ASP.NET Core
- HttpServerSessionMode.Stateful
- HttpServerSessionMode.StatefulForInitializeClients
- HttpServerSessionMode.Stateless
- July 28, 2026
- MCP C# SDK
- Mcp-Session-Id
- November 25, 2025
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