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Build and extend FastAPI applications from hello-world to production-grade APIs. This skill should be used when users want to create new FastAPI projects, add features (routing, validation, auth, database integration, middleware), debug FastAPI-specific issues, or deploy applications to Docker/Kubernetes. Always fetches latest official FastAPI documentation before implementation to ensure correct API patterns and best practices.
A skill for building RESTful APIs with FastAPI. Use this skill to create a new FastAPI project with a standard project structure, including routers, models, schemas, and services. This skill provides a boilerplate project, CRUD endpoint templates, Pydantic validation examples, and guidance on dependency injection, background tasks, file uploads, and pagination. It leverages async/await for efficient I/O operations. Trigger this skill when a user wants to build a RESTful API using FastAPI, needs a starter project, or wants to learn best practices for FastAPI development.
Add authentication and authorization to routes, Server Actions, and API endpoints using Supabase Auth. Use when user needs "protect [route]", "add authentication", "require login", "add RBAC", "implement login/logout", or mentions auth, permissions, OAuth, API keys. Provides patterns for protected routes, Server Action auth checks, role-based access control (5 roles), OAuth providers (Google, GitHub), email verification, password strength, account lockout, and API key authentication. Do NOT use when building new features (use worldcrafter-feature-builder which can add auth), database-only changes (use worldcrafter-database-setup for RLS policies), routes without auth (use worldcrafter-route-creator), or testing only (use worldcrafter-test-generator).
Express.js patterns for routing, middleware, error handling, and RESTful API development. Trigger: When building Express servers, when implementing REST APIs, when setting up middleware, when handling authentication in Express, when structuring Node.js backends.
Next.js 15 API route patterns, NextRequest, NextResponse, error handling, maxDuration configuration, authentication, request validation, server-side operations, route handlers, and API endpoint best practices. Use when creating API routes, handling requests, configuring timeouts, or building server-side endpoints.
ASP.NET Core utilities for JWT authentication and SPA hosting with domain-based routing. Use when building web apps needing JWT tokens, multi-SPA hosting, or development-mode controller filtering.
Create types.ts files with Zod schemas for Output SDK workflows. Use when defining input/output schemas, creating type definitions, or fixing schema-related errors.
Data serialization and transformation patterns. Use when formatting API responses.
Automatically applies when writing error handling in APIs and tools. Ensures errors are returned as structured JSON with error, request_id, and timestamp (not plain strings).
Production-ready FastAPI project scaffolding templates including directory structure, configuration files, settings management, dependency injection, MCP server integration, and development/production setup patterns. Use when creating FastAPI projects, setting up project structure, configuring FastAPI applications, implementing settings management, adding MCP integration, or when user mentions FastAPI setup, project scaffold, app configuration, environment management, or backend structure.
Creates repository interfaces in contracts, Supabase implementations, error codes, and error mappers. Use when asked to create a repository, add a data layer, or implement a new domain port.
Generates route specifications (distance, elevation, constraints) compatible with the app’s mapping layer.
Expert skill for implementing Better Auth with JWT tokens and JWKS (JSON Web Key Set) for secure authentication between Next.js frontend and FastAPI backend. Handles JWT token generation, verification, JWKS endpoint setup, and secure API communication. Includes setup for database integration, session management, and user isolation. Use when implementing authentication between frontend (Next.js) and backend (FastAPI) services with JWT tokens and JWKS.
Configure multi-platform deployment for FastAPI applications including Docker containerization, Railway, DigitalOcean App Platform, and AWS deployment. Use when deploying FastAPI apps, setting up production environments, containerizing applications, configuring cloud platforms, implementing health checks, managing environment variables, setting up reverse proxies, or when user mentions Docker, Railway, DigitalOcean, AWS, deployment configuration, production setup, or container orchestration.
Creates GORM entity structs for go-kratos microservices with BaseModel embedding, proper field tags, relationships (one-to-one, one-to-many), indexing strategies, and soft delete support. Use when defining database schema, creating new entities, setting up table relationships, or configuring database constraints.
Zod schema validation patterns. Use when validating API inputs and data.
Define database models with clear naming, proper data types, validation, relationships, and constraints to ensure data integrity. Use this skill when creating or modifying ORM model files, database schema definitions, model class files, or entity files. Use this when defining model relationships (has-many, belongs-to, many-to-many), setting up database constraints (NOT NULL, UNIQUE, foreign keys), adding timestamps and indexes, implementing model-level validations, or choosing appropriate data types for fields. Use this when working on files in directories like models/, entities/, app/models/, or any file that defines database table structures and relationships.
Implement JWT custom claims authentication for Supabase to reduce API database queries. Use when building Next.js API routes that need user authentication and authorization (role, company_id, facility_id). Embeds user metadata into JWT tokens to eliminate 40% of database queries per API request. Triggers when implementing authentication in API routes, optimizing Supabase queries, or setting up user session management.
Specialized agent for setting up Next.js 16+ projects and enforcing a Business-Oriented Modular Architecture (Screaming Architecture). Handles project scaffolding, App Router structure, path aliases, and file conventions to ensure code is organized by business domain. Trigger: "Setup Next.js project", "Next.js structure", "Scaffold Next.js app", "project architecture", "Business modules".
