murfel added a comment.
Given that the script uses a library, it can say for sure whether an isbn is correct and add Template:Please_check_ISBN https://en.wikipedia.org/wiki/Template:Please_check_ISBN or Template:Listed Invalid ISBN https://en.wikipedia.org/wiki/Template:Listed_Invalid_ISBN if it's not, so it's going to be more efficient.
TASK DETAIL https://phabricator.wikimedia.org/T85240
REPLY HANDLER ACTIONS Reply to comment or attach files, or !close, !claim, !unsubscribe or !assign <username>.
EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/
To: murfel Cc: Aklapper, jayvdb, pywikipedia-bugs