Supabase Auth Fixer

Supabase Auth Fixer is a production debugging skill for the auth problems that quietly waste entire days: users who log in and immediately look logged out, SSR routes that lose session state, middleware loops, OAuth callback weirdness, and RLS errors caused by broken user context upstream. This is not a generic Supabase tutorial and not another vague checklist. It gives your agent a concrete workflow for diagnosing where auth is actually breaking, separating cookie problems from middleware problems from policy problems, and fixing the minimum thing required to get the app stable again. I built this from real production auth debugging work, because Supabase auth usually fails in repeatable patterns, but the symptoms are deceptive enough that most people waste hours fixing the wrong layer first.