I don’t trust auto-tagging to be accurate when it comes to the music I listen to so I check everything manually, but I’d still like to use beets as a reassurance nothing slipped through.
Something like -p (pretend), -vv (verbose level 2), > (universal pipe) might do it.
beet -vv import -p myfiles >mylog.txt
Not sure though - test it out on files you don’t care about.