Nice work on this project! I've been looking for something like it for some time.

I'm wondering if the bot could be configured to run pre-commit. That way, it could do more than just format with black.

pre-commit + a GitHub bot would ensure that unformatted code never gets merged, and would take the burden off maintainers and contributors.

In an ideal world, unformatted code never gets committed because pre-commit prevents it. In a realistic world, contributors may forget to install the pre-commit hooks. The black_out bot would be the last resort, making the formatting commit for you.