Caioohv

Use when writing or modifying JavaScript/Node API endpoint responses (Express, Fastify, NestJS, Next.js/Remix route handlers, etc.). Ensures responses are human-friendly and never leak internals — stack traces, DB/ORM errors, file paths, secrets, internal IDs or enums.

Use when building or modifying any frontend/UI code. Favors reusable, composable components over duplication and enforces the design system defined in workflow/design.md (colors, typography, spacing, radii — no hardcoded values).