Use when creating pages under src/app/(site)/(authorized)/admin/. Covers list/detail/edit/create page patterns with DataTable/DataView/DataForm, repositories under src/repositories/, request schemas under src/requests/admin/, and AdminPageHeader breadcrumbs.
Use when modifying Better Auth + Prisma authentication: src/libraries/auth.ts, src/libraries/auth-client.ts, src/proxy.ts, src/services/auth_service.ts, auth-related actions.ts, or prisma/schema.prisma auth models (User/Session/Account/Verification). Covers session helpers, URL/secret env resolution, DB TLS, and PUBLIC_PATHS.
Use when creating or modifying files under src/repositories/, src/models/, or src/requests/. Covers BaseRepository inheritance (Prisma/API/Local/Airtable/Dify), Zod schema placement, and separation between repository and schema files.
Use when changing this template's mail delivery backend, reviewing email env setup, switching between `ses` and `smtp`, or adding a new provider such as Resend, SendGrid, Postmark, or Mailgun. Covers EMAIL_PROVIDER routing, EMAIL_FROM priority, dynamic import for Node-only SDKs, and test coverage for both email.test.ts and Better Auth callback smoke.
Use when adding or changing translations in messages/ja.json or messages/en.json, using getTranslations/useTranslations, or updating next-intl configuration under src/i18n/. Covers message key hierarchy, Server/Client Component APIs, dynamic and rich-text patterns, and JSON duplicate-key pitfalls.
Use when adding or modifying pages under src/app, or components under src/components (atoms/molecules/organisms) in this Next.js App Router project. Covers Server/Client Component boundary, Atomic Design placement, Server Actions in actions.ts, URL-based state management, sidebar active-state, and shadcn-only atoms rule.
Use when changing this template's object storage backend, reviewing storage env setup, switching between `s3`, `s3-compatible`, and `gcs`, or adding a new provider such as R2, MinIO, Spaces, Azure Blob, or GCS. Covers STORAGE_PROVIDER routing, S3Provider reuse for compatible services, forcePathStyle handling, SYSTEM_AWS_* env, and separation from image-display CSP/EXTRA_REMOTE_IMAGE_URLS.
Use when adding or updating *.stories.tsx files under src/components/. Covers pure-component discipline, required story variations (Default/Loading/Empty/Error/LongText), @storybook/addon-actions usage, and keeping components free of business logic.