building-with-medusalisted

# Medusa Backend Development Comprehensive backend development guide for Medusa applications. Contains patterns across 6 categories covering architecture, type safety, business logic placement, and common pitfalls. ## When to Apply **Load this skill for ANY backend development task, including:** - Creating or modifying custom modules and data models - Implementing workflows for mutations - Building API routes (store or admin) - Defining module links between entities - Writing business logic or validation - Querying data across modules - Implementing authentication/authorization **Also load these skills when:** - **building-admin-dashboard-customizations:** Building admin UI (widgets, pages, forms) - **building-storefronts:** Calling backend API routes from storefronts (SDK integration) ## CRITICAL: Load Reference Files When Needed **The quick reference below is NOT sufficient for implementation.** You MUST load relevant reference files before writing code for that component. **Load these references based on what you're implementing:** - **Creating a module?** → MUST load `reference/custom-modules.md` first - **Creating workflows?** → MUST load `reference/workflows.md` first - **Creating API routes?** → MUST load `reference/api-routes.md` first - **Creating module links?** → MUST load `reference/module-links.md` first - **Querying data?** → MUST load `reference/querying-data.md` first - **Adding authentication?** → MUST load `reference/authentication.md` first **Minim