Which part? The running of the script? Or the correcting of the errors/warnings? I’m not sure if the latter could be automated, because the warnings would really depend on the markup. I guess it’s possible, but it would be a pretty complex grunt task to write in order to do that. I don’t know if that would be practical unless you had a really strict markup structure – but even that would be difficult, in my opinion. But maybe someone else (or the author of the tool) has a better idea.