openapi-spec-generation

# OpenAPI Spec Generation Comprehensive patterns for creating, maintaining, and validating OpenAPI 3.1 specifications for RESTful APIs. ## When to Use This Skill - Creating API documentation from scratch - Generating OpenAPI specs from existing code - Designing API contracts (design-first approach) - Validating API implementations against specs - Generating client SDKs from specs - Setting up API documentation portals ## Core Concepts ### 1. OpenAPI 3.1 Structure ```yaml openapi: 3.1.0 info: title: API Title version: 1.0.0 servers: - url: https://api.example.com/v1 paths: /resources: get: ... components: schemas: ... securitySchemes: ... ``` ### 2. Design Approaches | Approach | Description | Best For | | ---------------- | ---------------------------- | ------------------- | | **Design-First** | Write spec before code | New APIs, contracts | | **Code-First** | Generate spec from code | Existing APIs | | **Hybrid** | Annotate code, generate spec | Evolving APIs | ## Templates ### Template 1: Complete API Specification ```yaml openapi: 3.1.0 info: title: User Management API description: | API for managing users and their profiles. ## Authentication All endpoints require Bearer token authentication. ## Rate Limiting - 1000 requests per minute for standard tier - 10000 requests per minute for enterprise tier version: 2.0.0 contact: name: API Support...