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Microsoft releases MCP C# SDK 2.0 with stateless HTTP and new discovery

By PulseAugur Editorial · [1 sources] ·

Microsoft has released the stable 2.0 version of its MCP C# SDK, which implements a significant protocol revision. This update defaults to a stateless HTTP transport, removing the need for session initialization and enabling better load balancing. Clients now use a discovery mechanism instead of a handshake, with request details embedded in headers for easier routing. Mid-call elicitation has been moved to Multi Round-Trip Requests, and several APIs related to roots, sampling, and logging are now deprecated. AI

RANK_REASON This is a release of a software development kit (SDK) version, not a frontier AI model release or significant industry event.

Read on dev.to — MCP tag →

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

Microsoft releases MCP C# SDK 2.0 with stateless HTTP and new discovery

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This is a release of a software development kit (SDK) version, not a frontier AI model release or significant industry event.
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COVERAGE [1]

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

    MCP C# SDK 2.0 is stable: HTTP is stateless by default, and 10 changes can break your upgrade

    <p>Microsoft announced the stable 2.0 line of the official MCP C# SDK this week, and <a href="https://www.infoq.com/news/2026/10/MCP-CSharp-SDK-Stateless/" rel="noopener noreferrer">InfoQ covered the announcement on October 26</a>. The short version: the SDK now implements the 20…

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