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Handle requests for capabilty, when capability not present #290

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Handle requests for capabilty, when capability not present #290

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15 changes: 13 additions & 2 deletions src/ModelContextProtocol/Shared/McpSession.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -298,7 +298,18 @@ private void HandleMessageWithId(JsonRpcMessage message, JsonRpcMessageWithId me
if (!_requestHandlers.TryGetValue(request.Method, out var handler))
{
LogNoHandlerFoundForRequest(EndpointName, request.Method);
throw new McpException($"Method '{request.Method}' is not available.", McpErrorCode.MethodNotFound);
await SendMessageAsync(new JsonRpcError
{
Id = request.Id,
JsonRpc = "2.0",
Error = new JsonRpcErrorDetail
{
Message = $"{EndpointName} lacks capability to do {request.Method}",
Code = (int) McpErrorCode.MethodNotFound,
},
RelatedTransport = request.RelatedTransport
}, cancellationToken).ConfigureAwait(false);
return null;
}

LogRequestHandlerCalled(EndpointName, request.Method);
Expand Down Expand Up @@ -764,4 +775,4 @@ private static TimeSpan GetElapsed(long startingTimestamp) =>

[LoggerMessage(Level = LogLevel.Trace, Message = "{EndpointName} sending message. Message: '{Message}'.")]
private partial void LogSendingMessageSensitive(string endpointName, string message);
}
}