MCP server list request error withouth useful info/data although it exists in the pipeline

[keiserS]

Bug Report

Overview

I'm calling Tool/MCP (my local implementation; checked and working on the address: https://localhost:7295/mcp/list_tools >> returns valid JSON)
Debugging full flow to catch the error "Error retrieving tool list from MCP server: \u0027my_mcp_server\u0027. Http status code: 424 (Failed Dependency)" shown in the picture... in the output Error object message is empty; since Excaption wasn't raised (my assumption).
Also noticed that

To Reproduce

Steps to reproduce the behavior:
Create/add MCP server tool and call Response API; EnableDebugging = true.

Expected behavior

Present true error that happened or was caught in the process of calling tools.

Screenshots

Additional context

[StephenHodgson]

Hard to read these screen shots. Can you give them in text form?

[keiserS]

Additionally, I have found out that after error happens, there is a response handled with this code:

case OpenAI.Responses.Response res:
    if (res.Error != null)
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine($">>> Message:{res.Error.Message}");
        Console.WriteLine("------------------------------------------");
        Console.ResetColor();
    }
    break;

Containing the http_error. Therefore, it may not be the bug I reported (included in the attached text file).

But there is one more problem with EnableDebugging = true; (same code): Exception with the stream is thrown because of reading an already closed stream. I have taken a quick look at the code, but I don't see the obvious stream (closure or disposal?!?)

Stack trace: 
   at System.Net.Http.HttpConnectionResponseContent.ConsumeStream()
   at System.Net.Http.HttpConnectionResponseContent.<<SerializeToStreamAsync>g__Impl|6_0>d.MoveNext()
   at System.Net.Http.HttpContent.<LoadIntoBufferAsyncCore>d__63.MoveNext()
   at System.Net.Http.HttpContent.<WaitAndReturnAsync>d__82`2.MoveNext()
   at OpenAI.Extensions.ResponseExtensions.<ReadAsStringAsync>d__18.MoveNext() in F:\Downloads\OpenAI-DotNet-main\OpenAI-DotNet-main\OpenAI-DotNet\Extensions\ResponseExtensions.cs:line 151
   at OpenAI.Extensions.ResponseExtensions.<CheckResponseAsync>d__15.MoveNext() in F:\Downloads\OpenAI-DotNet-main\OpenAI-DotNet-main\OpenAI-DotNet\Extensions\ResponseExtensions.cs:line 139
   at OpenAI.Extensions.BaseEndpointExtensions.<StreamEventsAsync>d__1.MoveNext() in F:\Downloads\OpenAI-DotNet-main\OpenAI-DotNet-main\OpenAI-DotNet\Extensions\BaseEndpointExtensions.cs:line 113
   at OpenAI.Extensions.BaseEndpointExtensions.<StreamEventsAsync>d__1.MoveNext() in F:\Downloads\OpenAI-DotNet-main\OpenAI-DotNet-main\OpenAI-DotNet\Extensions\BaseEndpointExtensions.cs:line 116
   at OpenAI.Responses.ResponsesEndpoint.<StreamResponseAsync>d__7.MoveNext() in F:\Downloads\OpenAI-DotNet-main\OpenAI-DotNet-main\OpenAI-DotNet\Responses\ResponsesEndpoint.cs:line 125
   at OpenAI.Responses.ResponsesEndpoint.<CreateModelResponseAsync>d__5.MoveNext() in F:\Downloads\OpenAI-DotNet-main\OpenAI-DotNet-main\OpenAI-DotNet\Responses\ResponsesEndpoint.cs:line 69
   at Program.<Main>d__4.MoveNext() in D:\MyProjects\Test\NET_Core\ConsoleTestApp\Program.cs:line 135

I have provided full console code /without AI API credentials (need to be set in the configuration).

new 1.txt
Program.cs.txt

[StephenHodgson]

Thanks I'll take a look

[keiserS]

Ok I found out the reason:
take a look in the class: BaseEndpointExtensions.StreamEventsAsync:
you have finally statement:

finally
{
     await response.CheckResponseAsync(baseEndpoint.EnableDebug, payload, null, events.Reverse().ToList(), cancellationToken).ConfigureAwait(false);
}

leading to this code in the class "ResponseExtensions":

  internal static async Task CheckResponseAsync(this HttpResponseMessage response, bool debug, StringContent requestContent, MemoryStream responseStream, List<ServerSentEvent> events, CancellationToken cancellationToken, [CallerMemberName] string methodName = null)
        {
            if (!response.IsSuccessStatusCode || debug)
            {
                await response.ReadAsStringAsync(debug, requestContent, responseStream, events, cancellationToken, methodName).ConfigureAwait(false);
            }
        }

where response.ReadAsStringAsync breaks since in this case while "EnableDebugging = true" (although IsSuccessStatusCode = true; bit its debug = true) that hits the reading of already consumed stream and breaks. So this part of the code needs to be handled differently.

KR,
K.