Arguments enter. They get marked up in red pen.
Paste in an argument — yours, theirs, a pundit's — and get a straight answer about how well it actually holds up: the fallacies by name, the claims resting on nothing, the one point that survives, plus the points to press if you want to argue back. Add a second argument and the two go head-to-head — with the strongest case for the first and the moves the second should make to shore itself up. Nobody wins, and nothing here is written for you to paste into a debate; the logic just gets graded and you get told what to do about it — with the token count and cost shown as it runs.