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Implementation for SEP-2243 Http Standardization (#1553)

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Co-authored-by: Tarek Mahmoud Sayed <tarekms@microsoft.com>
Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
Co-authored-by: Tarek Mahmoud Sayed <10833894+tarekgh@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Mike Kistler 2026-05-14 17:39:37 -05:00 • committed by GitHub
commit b8c4d951ec
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1 changed files with 2854 additions and 28 deletions
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26
src/ModelContextProtocol.Core/Client/McpClient.Methods.cs
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@ -176,6 +176,8 @@ public abstract partial class McpClient : McpSession
RequestOptions? options = null,
CancellationToken cancellationToken = default)
{
ToolCacheClearing?.Invoke();
List<McpClientTool>? tools = null;
ListToolsRequestParams requestParams = new() { Meta = options?.GetMetaForRequest() };
do
@ -184,6 +186,15 @@ public abstract partial class McpClient : McpSession
tools ??= new(toolResults.Tools.Count);
foreach (var tool in toolResults.Tools)
{
// Validate x-mcp-header annotations per SEP-2243.
// Clients MUST exclude tools with invalid annotations and SHOULD log a warning.
if (!McpHeaderExtractor.ValidateToolSchema(tool, out var rejectionReason))
{
ToolRejected?.Invoke(tool, rejectionReason!);
continue;
}
ToolDiscovered?.Invoke(tool);
tools.Add(new(this, tool, options?.JsonSerializerOptions));
}
@ -194,6 +205,21 @@ public abstract partial class McpClient : McpSession
return tools;
}
/// <summary>
/// Invoked when a tool definition is discovered from a <c>tools/list</c> response.
/// </summary>
internal Action<Tool>? ToolDiscovered;
/// <summary>
/// Invoked when a tool definition is rejected due to invalid <c>x-mcp-header</c> annotations.
/// </summary>
internal Action<Tool, string>? ToolRejected;
/// <summary>
/// Invoked before enumerating tools to clear any previously cached tool definitions.
/// </summary>
internal Action? ToolCacheClearing;
/// <summary>
/// Retrieves a list of available tools from the server.
/// </summary>