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MCP C# SDK adds hybrid sessions for seamless client upgrades

By PulseAugur Editorial · [1 sources] ·

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.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

MCP C# SDK adds hybrid sessions for seamless client upgrades

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The item describes a new feature for a software development kit, not a core AI release or significant industry event.
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Sukhpinder Singh ·

    MCP C# SDK Hybrid Sessions: Serve Old and New Clients on One Endpoint

    <p>The MCP C# SDK hybrid sessions option solves an awkward upgrade boundary: some clients still use the <code>2025-11-25</code> initialize handshake and depend on sessions, while clients on <code>2026-07-28</code> expect every HTTP request to stand alone. I want both groups to re…

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