Works like a charm with Claude desktop

[appliedaicoder]

Just wanted to say thank you for this library - I was googling on how to build an MVP for this using .NET and found this one.

Managed to get both a server and client working locally on a windows machine , then compiled it again on my macbook and got Claude AI desktop connected to the server and successfully execute my tool.

I will build on this MVP some more - one thing I noticed was that all of the client samples tried to connect to some node server.

Took me a bit to figure out how to connect to my own server using my client but got it working in the end.

Either way just wanted to say thanks - it worked out of the box (I referenced the project).

Look forward to the SSE enablement - but for now standard IO is working fine.

Cheers

[darrelmiller]

Were you able to get Claude Desktop running on Windows with the sample? I get this error when Claude Desktop starts up

2025-03-15T01:04:32.812Z [github] [info] Initializing server...
2025-03-15T01:04:32.869Z [github] [error] spawn D:\github\darrelmiller\mcpGitHub�in\Debug\net9.0\mcpGitHub.exe ENOENT {"context":"connection","stack":"Error: spawn D:\github\darrelmiller\mcpGitHub\bin\Debug\net9.0\mcpGitHub.exe ENOENT\n at ChildProcess._handle.onexit (node:internal/child_process:285:19)\n at onErrorNT (node:internal/child_process:483:16)\n at process.processTicksAndRejections (node:internal/process/task_queues:82:21)"}
2025-03-15T01:04:32.872Z [github] [error] spawn D:\github\darrelmiller\mcpGitHub�in\Debug\net9.0\mcpGitHub.exe ENOENT {"stack":"Error: spawn D:\github\darrelmiller\mcpGitHub\bin\Debug\net9.0\mcpGitHub.exe ENOENT\n at ChildProcess._handle.onexit (node:internal/child_process:285:19)\n at onErrorNT (node:internal/child_process:483:16)\n at process.processTicksAndRejections (node:internal/process/task_queues:82:21)"}
2025-03-15T01:04:33.593Z [github] [info] Server transport closed
2025-03-15T01:04:33.593Z [github] [info] Client transport closed
2025-03-15T01:04:33.594Z [github] [info] Server transport closed unexpectedly, this is likely due to the process exiting early. If you are developing this MCP server you can add output to stderr (i.e. console.error('...') in JavaScript, print('...', file=sys.stderr) in python) and it will appear in this log.
2025-03-15T01:04:33.594Z [github] [error] Server disconnected. For troubleshooting guidance, please visit our debugging documentation {"context":"connection"}

[darrelmiller]

I am using the published package though, rather than from source.

[cbleroibeukes]

Hi - Did not try windows , but this error is familiar as I had the same one on my Mac.

ENOENT = 'ERROR NO ENTRY POINT' (at least in my mind ;))

It's basically telling you that it wasn't able to start your .net application.

Reasons could be numerous , but the main one is probably syntax or PATH.

In my case it was because my arguments were incorrect and also my "command" value.

I suggest you use the command line window and first test it out yourself (to make sure it's working) and then that will help you setup the config.

This is my claude config - to start the .net application on my mac.

Claude config (mac):
{
"mcpServers": {
"myservice": {
"command": "/usr/local/share/dotnet/dotnet",
"args": [
"/Users/xxxx/Development/AI/McpServer/bin/Debug/.net8.0/McpServer.dll"
]
}
}
}

Thanks!

[cbleroibeukes]

Will see if I can test it later this week with Claude desktop on windows , might also add the sample (all it does is host a server and exposes a function that makes an api call in the background) , Claude automatically figures out the parameter mapping (based on detailed descriptions) from the tool.

This is part of the MVP I'm working on - the idea is to have the server (on startup) use an 'agent' (which would use local LLM with RAG (the open api spec for eg.)) to dynamically provide the tools and meta-data (when list tools called for example) for the server, hence allowing me to dynamically expose several functions/tools without necessarily having to code them but still have 'guard rails'.

Something like that ... work in progress.