Skip checkup returns "ModuleNotFoundError: No module named 'cffi'"

[OddMagnet]

I just installed skip via homebrew, running skip checkup gives me the following error:

Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.11/site-packages/xattr/lib.py", line 7, in <module>
    from ._lib import lib, ffi
ModuleNotFoundError: No module named '_cffi_backend'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/homebrew/bin/xattr", line 5, in <module>
    from xattr.tool import main
  File "/opt/homebrew/lib/python3.11/site-packages/xattr/__init__.py", line 13, in <module>
    from .lib import (XATTR_NOFOLLOW, XATTR_CREATE, XATTR_REPLACE,
  File "/opt/homebrew/lib/python3.11/site-packages/xattr/lib.py", line 9, in <module>
    from .lib_build import ffi, c_source
  File "/opt/homebrew/lib/python3.11/site-packages/xattr/lib_build.py", line 3, in <module>
    from cffi import FFI
ModuleNotFoundError: No module named 'cffi'

brew list | grep python gives me:

python-certifi
python@3.11
python@3.12
python@3.13
python@3.14

and pip list:

Package       Version
------------- -------
cffi          2.0.0
docopt        0.6.2
pip           25.3
pycparser     3.0
python-dotenv 1.2.1
setuptools    65.5.0

I already tried pip install cffi, but that just tells me it's already installed

Requirement already satisfied: cffi in /Users/NAME/.pyenv/versions/3.11.11/lib/python3.11/site-packages (2.0.0)
Requirement already satisfied: pycparser in /Users/NAME/.pyenv/versions/3.11.11/lib/python3.11/site-packages (from cffi) (3.0)

I also tried uninstalling everything cffi and reinstalling it, same for python and skip, but no luck there.

I'm not very knowledgable in terms of python development, so my google searches haven't brought me to a solution.

[OddMagnet]

I'm not a big fan of asking AI for solutions, but I thought I might as well try it for this questions.
Claude suggested installing xattr with pip, which solved the issue for me

[marcprux]

That's very surprising! We are expecting it to be resolved to system-provided xattr at /usr/bin/xattr (we just use it to clear the quarantine bit when installing skip).

What does the Python xattr even do?

[marcprux]

The next version of Skip will use the full path to xattr, so this issue shouldn't occur again. skiptools/skipstone@dc72e23