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Use when building NestJS applications requiring modular architecture, dependency injection, or TypeScript backend development. Invoke for modules, controllers, services, DTOs, guards, interceptors, Prisma. Keywords: NestJS, Nest, Node.js, TypeScript backend, dependency injection.
Guide for runtime validation with Zod in TypeScript. Covers schema design patterns, type inference, composition, error handling, and common patterns for domain modeling.
Better Auth JWT verification for Python/FastAPI backends. Use when integrating Python APIs with a Better Auth TypeScript server via JWT tokens. Covers JWKS verification, FastAPI dependencies, SQLModel/SQLAlchemy integration, and protected routes.
Implement runtime validation and type safety using Zod schemas for Content Collections, API inputs, form data, and environment variables. Use this skill when validating user input, API requests, content schemas, or ensuring data integrity. When working on Content Collections schema definitions in src/content/config.ts, API route input validation with Zod, form validation (server-side and client-side), environment variable validation, component prop validation with runtime checks, URL and query parameter validation, request body and form data sanitization, TypeScript runtime type validation, or custom Zod refinements and transformations.
Comprehensive authentication skill for Better Auth with TypeScript, Next.js 16, and JWT tokens. Use when implementing authentication systems with Better Auth, setting up Next.js App Router integration, or configuring JWT token authentication.
Build and modify Next.js App Router codebases using TypeScript, Tailwind CSS, and Prisma. Use for creating pages/layouts/components, route handlers (`app/api/*/route.ts`), server actions, and Prisma schema changes or database workflows in Next.js projects.
Generate Next.js API route handler with repository integration, error handling, and TypeScript types. Use when creating new API endpoints for meals, supplements, profile, analytics, or other resources.
Consume external APIs with type safety, robust error handling, and production-ready patterns. Handles OpenAPI/Swagger specs, GraphQL schemas, REST documentation, and example requests. Produces typed clients with authentication, retry logic, and comprehensive error handling. Primary focus on TypeScript with patterns applicable to other languages. Use this skill when integrating third-party APIs, generating API clients, or implementing authentication flows.
Frontend/backend API contract definitions. Use for defining API endpoints, Pydantic to TypeScript mapping, schema validation, error responses, and pagination contracts.
Generate production-ready Rails applications with Inertia.js, React, TypeScript, Server-Side Rendering (SSR), and ShadcnUI components, configured for deployment with Kamal. Use when creating new Rails projects that need modern SPA-like frontend with SEO-friendly SSR, or when helping users set up Inertia.js with Rails. Supports PostgreSQL, MySQL, and SQLite databases.
Validating external data from APIs, JSON parsing, user input, and any untrusted sources in TypeScript applications
API client code generation workflow. Use when modifying backend routes, response schemas, or request models. Automatically regenerates TypeScript API client from OpenAPI schema.
Generate Better Auth user schema configuration with custom additional fields for user profiles. Use when implementing authentication, user profiles, or extending user data models with Better Auth. Automatically generates TypeScript types and database schema.
Genera documentación de API OpenAPI/Swagger desde código (TypeScript, Express, Next.js).
Backend-Frontend integration patterns expert. Type-safe API contracts with Pydantic-Zod validation sync (Python FastAPI) or Prisma-TypeScript native (Next.js). Shadcn forms connected to backend, error handling, loading states. Use when creating full-stack features.
Node.js/TypeScript backend expert. Handles Express/Fastify API routes, TypeScript strict mode, Prisma ORM, Zod validation, error handling, configuration management. Use when project is Node.js backend (package.json + TypeScript server).
Build React components with TypeScript, Tailwind CSS, and React Query for the Medellin Spark platform. Use when implementing UI features, creating components, managing state, or optimizing frontend performance. Specializes in React hooks, shadcn/ui components, and Supabase integration.
