Hello, Overall it LGTM. I propose the mostly-cosmetic changes below. Once thing I overlooked before is that commands will have to live under /guix/extensions, right? (define (commands) "Return the list of commands, alphabetically sorted." (filter-map source-file-command (append (command-files) (append-map command-files (extension-directories))))) And likewise in ‘run-guix-command’. But now, if a channel provides ‘guix/scripts/foo.scm’, the ‘guix help’ command will not show ‘foo’ but the ‘guix foo’ command will effectively work (which wasn’t the case until now). Maybe it’s fine actually, I don’t know, but I thought this is worth mentioning and thinking though. WDYT? Ludo’.