# Backend API

> Design and implement RESTful APIs, GraphQL endpoints, and backend API architecture following modern standards. Use this skill when creating or modifying API endpoints, route handlers, controllers, API middleware, authentication/authorization logic, or any files that define HTTP endpoints such as routes.py, api.js, controllers/, endpoints/, or API specification files (OpenAPI/Swagger). Apply this skill when implementing API versioning, rate limiting, request/response handling, API documentation, or when working with API gateway configurations. This skill is essential for building scalable, secure, and well-documented APIs that follow RESTful principles, handle errors gracefully, and provide consistent developer experiences across microservices and serverless architectures.

- Skill: `diegosouzapw/backend-api-3` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add diegosouzapw/backend-api-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/diegosouzapw/backend-api-3/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: diegosouzapw (https://skillmd.com/u/diegosouzapw)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/diegosouzapw/backend-api-3

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# Backend API

This Skill provides Claude Code with specific guidance on how to adhere to coding standards as they relate to how it should handle backend API.

## When to use this skill

- When creating or modifying REST API endpoints, routes, or controllers
- When implementing GraphQL schemas, resolvers, or queries
- When working on API middleware, authentication, or authorization logic
- When designing API request/response structures and data serialization
- When implementing API versioning strategies (URL path or header-based)
- When adding rate limiting, throttling, or API security features
- When writing API documentation (OpenAPI/Swagger specifications)
- When working with files like `routes.py`, `api.js`, `controllers/`, `endpoints/`, or API gateway configs
- When implementing error handling and consistent HTTP status codes for APIs
- When building microservices communication patterns or serverless API functions
- When adding pagination, filtering, sorting, or search capabilities to API endpoints
- When implementing async APIs, webhooks, or event-driven API patterns

## Instructions

For details, refer to the information provided in this file:
[backend API](../../../agent-os/standards/backend/api.md)