• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

As test-bot is no longer an external command, I propose to change it to something different, f.e. https://github.com/DomT4/homebrew-autoupdate

Why autoupdate?

• This is a fairly popular (1.2k stars) and useful tap that has an external command. I think this is a good and representative example of what you can do with external commands
• It used to be a part of Homebrew and it was created by an ex-maintainer. Some current maintainers have contributed to it
• The docs acknowledge it as an "interesting third-party tap": https://docs.brew.sh/Interesting-Taps-and-Forks#unsupported-interesting-taps