Claude Debugs For You
aka Vibe Debugging
Enable Claude (or any other LLM) to interactively debug your code
This is an MCP Server and VS Code extension which enables claude to interactively debug and evaluate expressions.
That means it should also work with other models / clients etc. but I only demonstrate it with Claude Desktop and Continue here.
It’s language-agnostic, assuming debugger console support and valid launch.json for debugging in VSCode.
Getting Started
- Download the extension from releases or VS Code Marketplace
- Install the extension
- If using
.vsix directly, go to the three dots in “Extensions” in VS Code and choose “Install from VSIX…”
- You will see a new status menu item “Claude Debugs For You” which shows if it is running properly (check) or failed to startup (x)
You can click this status menu for the commands available
Follow one of the options below, depending on your setup
If using stdio (classic, required for Claude Desktop)
-
Copy the stdio server path to your clipboard by searching vs code commands for “Copy MCP Debug Server stdio path to clipboard”
-
Paste the following (BUT UPDATE THE PATH TO THE COPIED ONE!) in your claude_desktop_config.json or edit accordingly if you use other MCP servers
{
"mcpServers": {
"debug": {
"command": "node",
"args": [
"/path/to/mcp-debug.js"
]
}
}
}
- Start Claude desktop (or other MCP client)
- Note: You may need to restart it, if it was already running.
- You can skip this step if using Continue/Cursor or other built-in to VS Code
If using `/sse` (e.g. Cursor)
- Retrieve the MCP server sse address by using the “Copy MCP Debug Server sse address to clipboard” command
- You can just write it out server URL of “http://localhost:4711/sse”, or whatever port you setup in settings.
- Add it wherever you need to based on your client
- You may need to hit “refresh” depending on client: this is required in Cursor
- Start MCP client
- Note: You may need to restart it, if it was already running.
- You can skip this step if using Continue/Cursor or other built-in to VS Code
You’re ready to debug!
VS Code Debugging Documentation
Open a project containing a .vscode/launch.json with the first configuration setup to debug a specific file with ${file}.
See Run an Example below, and/or watch a demo video.
Contributing
Find bugs or have an idea that will improve this? Please open a pull request or log an issue.
Does this readme suck? Help me improve it!
Demo
It figures out the problem, and then suggests a fix, which we just click to apply
https://github.com/user-attachments/assets/3a0a879d-2db7-4a3f-ab43-796c22a0f1ef
How do I set this up with Continue? / Show MCP Configuration
Read the docs!
Configuration:
{
...
"experimental": {
"modelContextProtocolServers": [
{
"transport": {
"type": "stdio",
"command": "node",
"args": [
"/Users/jason/Library/Application Support/Code/User/globalStorage/jasonmcghee.claude-debugs-for-you/mcp-debug.js"
]
}
}
]
}
}
You’ll also need to choose a model capable of using tools.
When the list of tools pops up, make sure to click “debug” in the list of your tools, and set it to be “Automatic”.
Troubleshooting
If you are seeing MCP errors in continue, try disabling / re-enabling the continue plugin
If helpful, this is what my configuration looks like! But it’s nearly the same as Claude Desktop.
Using Claude Desktop
In this example, I made it intentionally very cautious (make no assumptions etc - same prompt as below) but you can ask it to do whatever.
https://github.com/user-attachments/assets/ef6085f7-11a2-4eea-bb60-b5a54873b5d5
Developing
- Clone / Open this repo with VS Code
- Run
npm run install and npm run compile
- Hit “run” which will open a new VSCode
- Otherwise same as “Getting Started applies”
- To rebuild,
npm run compile
Package
vsce package
Run an Example
Open examples/python in a VS Code window
Enter the prompt:
i am building `longest_substring_with_k_distinct` and for some reason it's not working quite right. can you debug it step by step using breakpoints and evaluating expressions to figure out where it goes wrong? make sure to use the debug tool to get access and debug! don't make any guesses as to the problem up front. DEBUG!
Other things worth mentioning
When you start multiple vs code windows, you’ll see a pop-up. You can gracefully hand-off “Claude Debugs For You” between windows.
You can also disable autostart. Then you’ll just need to click the status menu and select “Start Server”.
Short list of ideas
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