Master API Design: REST, GraphQL & OpenAPI Skills for AI Agents

Master API Design: REST, GraphQL & OpenAPI Skills for AI Agents

This skill package equips AI coding agents such as Claude Code, Cursor, and Codex with the ability to effectively design, review, and document APIs. It focuses on various aspects of API design and contract engineering, including REST resource modeling, GraphQL schemas, OpenAPI, and comprehensive API contract testing.

What this skill does

• Supports REST resource modeling and ensures endpoints are predictable and standardized.
• Implements error envelopes, pagination, and filtering to improve API interaction.
• Ensures idempotency and versioning to facilitate API longevity and reliability.
• Manages rate limiting and webhooks to stabilize API performance and event handling.
• Utilizes OpenAPI and GraphQL schema design for enhanced API discovery and integration.
• Conducts contract testing to verify API behavior against defined specifications.
• Establishes a framework for N+1 defense strategies in GraphQL implementations.

Who it is for

Developers and development teams using AI agents like Claude Code, Cursor, and Codex who are involved in API development, review, or documentation will benefit from this skill. It is particularly valuable for those focusing on API stability and consumer compatibility in their projects.

Use cases

• Designing and reviewing new API endpoints to ensure adherence to best practices and standards.
• Documenting API changes for internal and external users in a consistent manner using OpenAPI.
• Testing API contracts during integration phases to validate expected behaviors.
• Optimizing existing APIs for better performance, error handling, and usability.

Technical details

This skill leverages concepts from REST and GraphQL specifications, employing tools for API contract testing and documentation through OpenAPI. It enhances accessibility, aids in AI application processes, and refines API contracts to maintain robust and reliable endpoints.

Source & Licence

This package is built on open-source work published by Kin9Zeus (Kin9Zeus/senior-engineer-skills) and distributed under MIT. The original licence text and copyright notice are included in your download.

Personal and commercial use, modification and redistribution are permitted, provided the original copyright and licence notice are retained.

Your purchase covers curation, licence verification, packaging, documentation and instant delivery. It does not grant exclusive rights to the underlying open-source code, which remains available under its original licence.

Delivery & Support

• Delivery: instant — a secure download link is emailed to you as soon as payment is confirmed.
• Format: ZIP archive containing the skill files, documentation and the original licence.
• Support: support@mcpcart.com — we aim to reply within 2 business days.
• Updates: updates are included only where stated on this page.

Refunds

This is a digital product delivered immediately after purchase. By completing your order you request immediate delivery and acknowledge that, once the download has been accessed, the statutory right to cancel no longer applies to the extent permitted by law. Refund requests are handled in accordance with our published Refund Policy.

Claude, Codex, Gemini and Cursor are trademarks of their respective owners. MCP Cart is an independent marketplace and is not affiliated with, endorsed by, or sponsored by any of them. Compatibility references describe interoperability only.