Better Auth Plugins

This walks Claude through Better Auth's plugin system for adding authentication features like 2FA, magic links, passkeys, and organizations to TypeScript apps. You'll use it when you need to extend basic auth with server-side plugins and their matching client-side counterparts. The skill covers the standard flow: import from better-auth/plugins, add to your config, run migrations if the plugin touches the database, then wire up the client plugin. The main gotcha is keeping server and client plugins paired so your APIs stay in sync, and remembering that nextCookies needs to go last if you're using it. Solid reference material for the plugin ecosystem without having to context-switch to docs.