Hey HN,
this is a small project I've worked on and off on the last year. I tried to picture how it would be to have a Magit-inspired interface for any command, without needing to use Emacs (i.e. directly in the terminal). Brief only really covers a small part of Magit's interface concepts: transient commands. See the Readme for more details! I also had to create a small "standard" for documenting command line options in a way that can be programatically procesed, which is something that has been discussed in HN before.