Better Auth is a real open source authentication framework built for TypeScript applications. The upstream project lives at GitHub under better-auth/better-auth, ships the better-auth npm package, and documents the core setup flow on the official Better Auth docs site. That makes it a strong fit for ASE because an agent can reference one package name, one upstream repository, and one documentation surface instead of inventing ad hoc auth glue.

This skill is useful when the job to be done is adding or refactoring authentication in a Next.js, Nuxt, SvelteKit, or other TypeScript-based app. An agent can use Better Auth to configure email and password sign-in, social OAuth providers, session management, passkeys, and extensible plugins from the framework’s API surface. It can also connect Better Auth to a database layer, generate or update environment variable requirements, and map route handlers or middleware to the framework’s documented patterns.

In practice, this skill helps with installation, provider setup, schema planning, session lifecycle handling, and debugging auth configuration errors. It also gives agents a specific integration target when migrating away from custom auth code or heavier hosted auth platforms. Because the project has an active upstream repo, npm distribution, and official documentation, it clears the intake gate as a source-backed, verifiable skill rather than a speculative pattern.