If you're building anything on Medusa's backend, load this before you start. It enforces the critical architecture pattern (modules feed workflows, workflows feed API routes, routes feed frontend) and catches the mistakes that break Medusa apps: calling services directly from routes, skipping workflows for mutations, using PUT/PATCH methods, or treating prices like they're stored in cents when they're not. The skill itself is a quick reference with six rule categories, but the real value is that it forces you to load the actual reference files (custom modules, workflows, API routes) before implementing. Think of it as a checklist that prevents you from writing code that compiles but violates Medusa's architectural assumptions.
npx skills add https://github.com/medusajs/medusa-agent-skills --skill building-with-medusa