create-auth

SKILL.md

Create Auth Skill

Guide for adding authentication to TypeScript/JavaScript applications using Better Auth.

For code examples and syntax, see better-auth.com/docs.

Phase 1: Planning (REQUIRED before implementation)

Before writing any code, gather requirements by scanning the project and asking the user structured questions. This ensures the implementation matches their needs.

Step 1: Scan the project

Analyze the codebase to auto-detect:

Framework — Look for next.config, svelte.config, nuxt.config, astro.config, vite.config, or Express/Hono entry files.

Database/ORM — Look for prisma/schema.prisma, drizzle.config.ts, package.json deps (pg, postgres, @neondatabase/serverless, mysql2, better-sqlite3, mongoose, mongodb). If drizzle.config.ts exists, read its dialect field to determine the DB type (e.g., "postgresql" → Drizzle + Postgres). Also check which Drizzle driver is installed (drizzle-orm/node-postgres → pg, drizzle-orm/postgres-js → postgres, drizzle-orm/neon-http → Neon).

Existing auth — Look for existing auth libraries (next-auth, lucia, clerk, supabase/auth, firebase/auth) in package.json or imports.

Package manager — Check for pnpm-lock.yaml, yarn.lock, bun.lockb, or package-lock.json.