This drops Better Auth into Claude Code projects when you need authentication that actually works with Cloudflare D1 and modern TypeScript stacks. It's built for self-hosting across 15+ frameworks (Next.js, Nuxt, Workers, Remix) and includes OAuth, 2FA, passkeys, RBAC, and multi-tenant setups. The skill prevents about 20 common errors, mostly around D1 adapter confusion (there's no d1Adapter, you use Drizzle or pass the binding directly in v1.5+) and ESM-only requirements since v1.4. It's a solid Clerk alternative if you want control over your auth stack. The documentation makes migration straightforward, and the new CLI tools in v1.5 handle schema generation and upgrades cleanly.
npx skills add https://github.com/secondsky/claude-skills --skill better-auth