• there's no readme
• there's no license
• you've got a few security bugs waiting to happen (shell=True, sys.path.append('.'))
• executables are typically kebab-case not snake_case
• your project should not contain pre-commit- as it is not affiliated with pre-commit

Thank you for taking a look!

• README and license added
• Removed shell=True and use sys.path.append("") as per expectation for when script dir is not available
• Executable is now assert-changelog
• README clarifies this is a pre-commit hook and not a pre-commit project but I am happy to change the repo -- I just followed what seemed to be the general consensus on github

pre-commit doesn't run with unstaged changes so I don't think this hook will work at all

The behaviour I'm seeing is pre-commit emits a warning on unstaged changes and stashes them. The list of unstaged files is inferred by assert-changelog (https://github.com/SamStudio8/pre-commit-assert-changelog/blob/main/assert_changelog/main.py#L108). It demonstrably works for me but happy to admit this is a very alpha project that perhaps should not be in your list.

--cached is an alias for --staged so I suspect your tool is not working