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Deprecate McpErrorCode.ResourceNotFound (-32002) and use McpErrorCode.InvalidParams (-32602) per SEP-2164 (#1558)

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Jayaraman Venkatesan 2026-05-26 10:59:03 -04:00 • committed by GitHub
commit b99d887b46
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1 changed files with 77 additions and 15 deletions
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8
src/ModelContextProtocol.Core/Server/McpServerImpl.cs
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@ -421,7 +421,13 @@ internal sealed partial class McpServerImpl : McpServer
listResourcesHandler ??= (static async (_, __) => new ListResourcesResult());
listResourceTemplatesHandler ??= (static async (_, __) => new ListResourceTemplatesResult());
readResourceHandler ??= (static async (request, _) => throw new McpProtocolException($"Unknown resource URI: '{request.Params?.Uri}'", McpErrorCode.ResourceNotFound));
readResourceHandler ??= (static async (request, _) =>
{
var errorCode = McpHttpHeaders.UseInvalidParamsForMissingResource(request.Server.NegotiatedProtocolVersion)
? McpErrorCode.InvalidParams
: McpErrorCode.ResourceNotFound;
throw new McpProtocolException($"Unknown resource URI: '{request.Params?.Uri}'", errorCode);
});
subscribeHandler ??= (static async (_, __) => new EmptyResult());
unsubscribeHandler ??= (static async (_, __) => new EmptyResult());
var listChanged = resourcesCapability?.ListChanged;