API Design

Design REST or GraphQL API contracts with documentation-first specifications.

13|8|Updated May 8, 2026
One-click install
npx skills add https://github.com/ishandutta2007/Awesome-Claude-Skills --skill api-design-ishandutta2007
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: API Design
Source: https://github.com/ishandutta2007/Awesome-Claude-Skills/tree/main/skills/api-design
Command: npx skills add https://github.com/ishandutta2007/Awesome-Claude-Skills --skill api-design-ishandutta2007

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It prevents brittle, inconsistent, and hard-to-maintain API contracts by guiding you to design endpoints, schemas, and error handling before implementation.

Core Features & Use Cases

  • Deep Module Interface Design: Crafts high-leverage interfaces that encapsulate complexity behind simple, stable methods.
  • Consistency and Backward Compatibility: Aligns shapes, naming, and data structures with existing conventions while protecting existing consumers.
  • Documentation First: Produces an explicit endpoint and schema specification (OpenAPI, GraphQL schema, or the project’s preferred format) plus rationale.

Quick Start

Ask the API Design skill to design a versioned PATCH endpoint for updating a core domain entity and to include request/response shapes, pagination/auth considerations, and a documented error model.

Frequently Asked Questions about API Design

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I design a REST API schema that maintains backward compatibility?

To design a REST API schema with backward compatibility, you must align data structures and naming with existing conventions while encapsulating complexity behind stable, deep module interfaces to protect current consumers.

What is the best way to document an OpenAPI or GraphQL endpoint before implementation?

The best way to document an API endpoint before implementation is a documentation-first approach, producing explicit OpenAPI or GraphQL schema specifications alongside the design rationale for request and response shapes.

How do you handle edge cases like pagination and rate limiting in API design?

Handling edge cases in API design requires context-aware resource mapping and edge-case grilling to explicitly define pagination, authentication, rate limiting, and partial updates within the interface contract.

Can I use a documentation-first approach for refining existing API schemas?

Yes, you can use a documentation-first approach for refining existing API schemas by revisiting API design decisions to ensure consistency, deep module encapsulation, and safe evolution without breaking existing consumers.

How do I structure clear error codes and messages in a GraphQL or REST contract?

Structuring clear error codes and messages in a REST or GraphQL contract involves defining a documented error model that encapsulates complexity and provides explicit feedback for edge-case scenarios.