skills.rest
koolerkx
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api-and-interface-design

Define stable REST and GraphQL contracts with consistent error semantics.

Updated May 26, 2026
Search Tags:#design#interfaces#rest#graphql#contract-first#api-design
One-click install
npx skills add https://github.com/koolerkx/vibe-react-2d-map-editor-yaml --skill api-and-interface-design-koolerkx
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: api-and-interface-design
Source: https://github.com/koolerkx/vibe-react-2d-map-editor-yaml/tree/main/.claude/skills/api-and-interface-design
Command: npx skills add https://github.com/koolerkx/vibe-react-2d-map-editor-yaml --skill api-and-interface-design-koolerkx

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Designing stable APIs and clear interfaces prevents misuse, reduces coupling, and speeds cross-team collaboration, ensuring public contracts stay reliable as systems evolve.

Core Features & Use Cases

  • Define contract-first interfaces before implementation to establish clear boundaries between modules, services, and teams.
  • Create consistent error handling, versioning, and data shape conventions to reduce integration friction across REST, GraphQL, and internal boundaries.
  • Use case: design a public API surface for a new microservice, including task definitions, inputs, outputs, and error semantics to guide implementation.

Quick Start

Draft a contract-first interface for a new service, outlining input/output types and error formats, then align frontend and backend teams around the contract.

Frequently Asked Questions about api-and-interface-design

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

FAQPage Schema
What is contract-first API design and when should I use it?▼

Contract-first API design defines stable interface contracts and module boundaries before implementation. Use it to prevent misuse and reduce integration friction across REST, GraphQL, and internal service boundaries.

How do I design a stable API surface for a new microservice?▼

Define a stable API surface by drafting input/output types, task definitions, and consistent error formats. Align frontend and backend teams around this contract to guide implementation and prevent miscommunication.

Does this approach work for both REST and GraphQL endpoints?▼

Yes, contract-first design applies to both REST and GraphQL endpoints. It establishes consistent error semantics, validation at boundaries, and data shape conventions to reduce coupling across cross-team workflows.

What's the best way to handle API versioning and backward compatibility?▼

Handle API versioning by applying additive, backward-compatible changes to existing contracts. Maintain consistent error semantics and validate data at module boundaries to keep public interfaces reliable as systems evolve.

How do I establish consistent error handling across module interfaces?▼

Establish consistent error handling by defining error semantics within the initial contract-first interface. Apply these conventions uniformly across REST, GraphQL, and internal boundaries to reduce integration friction.

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