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Align x-mcp-header implementation with SEP-2243 spec clarifications (#1619)

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Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
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Tarek Mahmoud Sayed 2026-06-05 15:45:08 -07:00 • committed by GitHub
commit ed19286a08
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1 changed files with 1035 additions and 116 deletions
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6
src/ModelContextProtocol.Core/Client/McpClient.Methods.cs
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@ -186,8 +186,10 @@ 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.
// Validate x-mcp-header annotations per SEP-2243. The spec requires Streamable HTTP
// clients to exclude tools with invalid annotations and permits other transports
// (e.g., stdio) to ignore the annotations entirely. This client validates on all
// transports so a malformed definition is rejected consistently regardless of transport.
if (!McpHeaderExtractor.ValidateToolSchema(tool, out var rejectionReason))
{
ToolRejected?.Invoke(tool, rejectionReason!);