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MCP C# SDK 2.0.0: Why Pinning Protocol Version 2026-07-28 Matters for Stateless Apps

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The MCP C# SDK 2.0.0 defaults to the 2026-07-28 protocol but automatically falls back to older versions when connecting to stateful servers, which can silently change the wire contract. The 2026-07-28 specification eliminates the initialize handshake and HTTP sessions, allowing clients to send per-request capabilities via server/discover. When fallback occurs, health checks may stay green while code built on stateless or modern-only assumptions runs under legacy session rules. Developers can enforce a minimum protocol version by setting the ProtocolVersion field in McpClientOptions, causing connections to fail rather than silently downgrade. Inspecting both NegotiatedProtocolVersion and SessionId after connecting is recommended to make any compatibility fallback visible in logs.

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