Next.js Supabase Auth skill: what it does and how to install it

What it does. Sets up browser and server Supabase clients, refreshes sessions and protects routes with middleware, and handles OAuth callbacks and authentication server actions. It also checks for insecure session checks, missing callbacks, incorrect client usage, absent error handling and stale cache revalidation.

When to use it. For login, logout, signup, OAuth, session management and protected routes in a Next.js App Router application using Supabase Auth. It works alongside skills for the Next.js App Router and Supabase backend.