The Ruff VS Code extension uses the wrong `ruff.toml` file

[ebbek]

Summary

I have a bunch of projects that do not follow the PEP8 formatting rules (longer lines and non-standard indentation). For these I have made custom ruff.toml file that is referred to in the respective pyproject.toml files like this:

[tool.ruff]
extend = "~/projects/notpep8/ruff.toml"

The file structure is like this:

~/projects --- notpep8 -+- ruff.toml
                        |
                        +- proj -+- pyproject.toml
                        |        |
                        |        +- src --- example.py

This works perfectly when running ruff check from the command line in the respective project directories.

However when running ruff in VS Code using that Astral ruff extension, this seems to be ignored and instead the global PEP8 compliant ruff.toml file is used. This of course produces loads of errors.

I have tried several different things:

• Made an intentional error in pyproject.toml. This is detected so ruff does look at the file.
• Added "ruff.configuration": "~/projects/notpep8/ruff.toml" lines to the various settings.json files. That does not change anything.

As far as I can see from the attached log file ruff does seem to load the local ruff.toml file - and then it loads the global one immediately afterwards.

ruff.log

Version

ruff 0.16.6 (22f65a2 2026-09-03)

[MichaReiser]

Hi.

I tried to reproduce this on linux and failed. This could be a windows specific issue, but reproducing it would be easier if you could create a small reproduction. Ideally a single zip with:

• Your shared configuration (can be a downsized version of it that only configures the PEP8 relevant rules)
• An example.py that contains code that Ruff incorrectly flags (in VS Code but not when using ruff check)
• The Project's pyproject.toml

Thank you

[ebbek]

I have created the attached quick-and-dirty example in the notpep8.zip file. It must be unpacked in the directory ~/projects.

The ruff.zip file contains a copy of my global ruff.toml file

VS Code shall have at least the Python and Ruff extensions installed and it shall be started from the projectdirectory like this:

code .\.vscode\project.code-workspace &

notpep8.zip

ruff.zip

[MichaReiser]

Thank you. Unfortunately, I'm still unable to reproduce. I'll try go get hold of a Windows machine to see if I can reproduce it there. But in the meantime:

Could you open src/example.py in the reproduction workspace, run Ruff: Print debug information (native server only) from the Command Palette, and share the output? Please review the output for private paths before posting.

[ebbek]

Done:

ruffdebug.txt

And by the way: I have tried it on Linux now and I too cannot reproduce the problem on that platform.

Edit: It also works as expected when using the windows version of ´code´ in WSL.