api-developer

Original：🇺🇸 English

Translated

Use when building and maintaining APIs for applications and services.

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Sourcepaulund/skills

Added on2026-03-09

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SKILL.md Content

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API Developer

Core Workflow

Analyze Requirements: Understand the business needs and define the API endpoints required.
Design API: Create API designs that follow RESTful principles and best practices.
Implement Endpoints: Develop the API endpoints with appropriate HTTP methods and status codes.
Secure API: Implement authentication and authorization mechanisms.
Document API: Use OpenAPI/Swagger to document the API endpoints, request/response formats, and error codes.
Test API: Perform thorough testing to ensure functionality, security, and performance.
Monitor API: Set up monitoring to track API usage, performance, and errors.
Maintain API: Regularly update the API to fix bugs, improve performance, and add new features.
Version API: Implement versioning strategies to manage breaking changes.

Reference Guide

Load the detailed guidance based on on context:

Topic	Reference	Load When
HTTP Methods	references/01-http-methods.md	When deciding on appropriate HTTP methods for endpoints
Resource Naming	references/02-resource-naming.md	When naming API endpoints and structuring URL hierarchies
Versioning	references/03-versioning.md	When planning breaking changes or deprecating API versions
Status Codes	references/04-status-codes.md	When choosing HTTP status codes for responses
Filtering & Pagination	references/05-filtering-pagination.md	When implementing list endpoints with filtering, sorting, or pagination
Response Shape	references/06-response-shape.md	When structuring JSON response envelopes for data and errors
Including Related Data	references/07-including-related-data.md	When implementing optional expansion of related resources
Field Naming	references/08-field-naming.md	When defining field names in request/response payloads
Datetime Handling	references/09-datetime-handling.md	When working with dates and times in API payloads
Authentication & Tokens	references/10-authentication-tokens.md	When implementing authentication or token management
Rate Limiting	references/11-rate-limiting.md	When implementing request throttling or abuse prevention
Security Basics	references/12-security-basics.md	When reviewing API security or handling untrusted input
Validation Errors	references/13-validation-errors.md	When formatting validation error responses
Caching	references/14-caching.md	When implementing HTTP caching for GET endpoints
Idempotency	references/15-idempotency.md	When ensuring safe retries for mutating operations
Error Handling	references/16-error-handling.md	When mapping exceptions to API error responses
Documentation	references/17-documentation.md	When creating or updating OpenAPI specs
Deprecation	references/18-deprecation.md	When planning to retire or replace API endpoints
Consistency Rules	references/19-consistency-rules.md	When reviewing API design for style guide compliance
Pre-Release Checklist	references/20-pre-release-checklist.md	Before releasing a new API or major endpoint

Constraints

MUST DO

Must follow RESTful principles and best practices.
Ensure all endpoints are secure and protected against common vulnerabilities.
Document all API endpoints clearly using OpenAPI/Swagger.
Implement proper error handling and return meaningful status codes.
Monitor API performance and set up alerts for downtime or errors.

MUST NOT DO

Expose sensitive data through the API.
Implement breaking changes without proper versioning.
Ignore performance optimization opportunities.
Overcomplicate API designs; keep them simple and intuitive.
Neglect testing; ensure all endpoints are thoroughly tested before deployment.