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Add Extensions support to ClientCapabilities and ServerCapabilities (#1317)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
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Copilot 2026-02-21 00:08:20 -08:00 • committed by GitHub
commit c2aa6a5123
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2 changed files with 164 additions and 3 deletions
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27
src/ModelContextProtocol.Core/Protocol/ClientCapabilities.cs
View file

@ -93,4 +93,31 @@ public sealed class ClientCapabilities
[JsonInclude]
[JsonPropertyName("tasks")]
internal McpTasksCapability? TasksCore { get; set; }
/// <summary>
/// Gets or sets optional MCP extensions that the client supports.
/// </summary>
/// <remarks>
/// <para>
/// Keys are extension identifiers in reverse domain notation with an extension name
/// (e.g., <c>"io.modelcontextprotocol/oauth-client-credentials"</c>), and values are
/// per-extension settings objects. An empty object indicates support with no additional settings.
/// </para>
/// <para>
/// Extensions provide a framework for extending the Model Context Protocol while maintaining
/// interoperability. Clients advertise extension support via this field during the initialization handshake.
/// </para>
/// </remarks>
[Experimental(Experimentals.Extensions_DiagnosticId, UrlFormat = Experimentals.Extensions_Url)]
[JsonIgnore]
public IDictionary<string, object>? Extensions
{
get => ExtensionsCore;
set => ExtensionsCore = value;
}
// See ExperimentalInternalPropertyTests.cs before modifying this property.
[JsonInclude]
[JsonPropertyName("extensions")]
internal IDictionary<string, object>? ExtensionsCore { get; set; }
}

27
src/ModelContextProtocol.Core/Protocol/ServerCapabilities.cs
View file

@ -92,4 +92,31 @@ public sealed class ServerCapabilities
[JsonInclude]
[JsonPropertyName("tasks")]
internal McpTasksCapability? TasksCore { get; set; }
/// <summary>
/// Gets or sets optional MCP extensions that the server supports.
/// </summary>
/// <remarks>
/// <para>
/// Keys are extension identifiers in reverse domain notation with an extension name
/// (e.g., <c>"io.modelcontextprotocol/apps"</c>), and values are per-extension settings
/// objects. An empty object indicates support with no additional settings.
/// </para>
/// <para>
/// Extensions provide a framework for extending the Model Context Protocol while maintaining
/// interoperability. Servers advertise extension support via this field during the initialization handshake.
/// </para>
/// </remarks>
[Experimental(Experimentals.Extensions_DiagnosticId, UrlFormat = Experimentals.Extensions_Url)]
[JsonIgnore]
public IDictionary<string, object>? Extensions
{
get => ExtensionsCore;
set => ExtensionsCore = value;
}
// See ExperimentalInternalPropertyTests.cs before modifying this property.
[JsonInclude]
[JsonPropertyName("extensions")]
internal IDictionary<string, object>? ExtensionsCore { get; set; }
}