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Improve protocol version handling (#468)

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Right now by default, the client and server hardcode the initial spec version, and if there's a mismatch, the request fails.

With this change, by default both client and server are allowed to float to any supported version.
This commit is contained in:
Stephen Toub 2025-06-02 23:03:57 -04:00 • committed by GitHub
commit e0b058f260
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1 changed files with 45 additions and 12 deletions
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13
src/ModelContextProtocol.Core/Client/McpClientOptions.cs
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@ -34,11 +34,18 @@ public class McpClientOptions
/// Gets or sets the protocol version to request from the server, using a date-based versioning scheme.
/// </summary>
/// <remarks>
/// <para>
/// The protocol version is a key part of the initialization handshake. The client and server must
/// agree on a compatible protocol version to communicate successfully. If the server doesn't support
/// the requested version, it will respond with a version mismatch error.
/// agree on a compatible protocol version to communicate successfully.
/// </para>
/// <para>
/// If non-<see langword="null"/>, this version will be sent to the server, and the handshake
/// will fail if the version in the server's response does not match this version.
/// If <see langword="null"/>, the client will request the latest version supported by the server
/// but will allow any supported version that the server advertizes in its response.
/// </para>
/// </remarks>
public string ProtocolVersion { get; set; } = "2024-11-05";
public string? ProtocolVersion { get; set; }
/// <summary>
/// Gets or sets a timeout for the client-server initialization handshake sequence.