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api-and-interface-design

Define public API contracts for REST and GraphQL endpoints.

Updated Feb 9, 2026
Search Tags:#design#api#interfaces#rest#graphql#type-safety#contracts
One-click install
npx skills add https://github.com/tradertunante/servicecontrol --skill api-and-interface-design-tradertunante
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: api-and-interface-design
Source: https://github.com/tradertunante/servicecontrol/tree/main/.claude/skills/api-and-interface-design
Command: npx skills add https://github.com/tradertunante/servicecontrol --skill api-and-interface-design-tradertunante

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Define public API contracts and interface boundaries to prevent misuse and ambiguity.

Core Features & Use Cases

  • Contract-first API design: specify inputs, outputs, and error semantics before implementation.
  • Interface contracts across modules: define boundaries between services, components, or frontend-backend APIs.
  • Consistent API quality: align REST and GraphQL schemas with type contracts and predictable evolution.

Quick Start

Analyze a current API surface, write a contract describing input/output shapes, then implement against it.

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 how does it prevent interface misuse?▼

Contract-first API design specifies inputs, outputs, and error semantics before implementation to define stable public API contracts and interface boundaries, preventing ambiguity and misuse across REST and GraphQL endpoints.

How do I design non-breaking REST and GraphQL API changes?▼

Design non-breaking API changes by enforcing additive evolution and consistent error semantics in your public contracts. Specify type-safe input and output shapes upfront so REST and GraphQL schemas remain predictable across teams.

How do I define interface boundaries between frontend and backend modules?▼

Define frontend-backend interface boundaries by writing a contract that describes input and output shapes for module APIs. This contract-first approach prevents ambiguity and aligns type safety across separate teams.

Can I apply type-safe contracts to both REST and GraphQL endpoints?▼

Yes, you can apply type-safe contracts to both REST and GraphQL endpoints. The approach aligns schemas with consistent type contracts and predictable evolution rules to maintain API quality across different endpoint architectures.

What's the best way to align API error semantics across multiple services?▼

Align API error semantics by defining consistent error contracts before implementation. Specify error semantics in your public API contracts to ensure predictable, non-breaking evolution across module boundaries and frontend-backend handoffs.

When do I need to write an API contract for my module boundaries?▼

Write an API contract for module boundaries when you need to prevent misuse and ambiguity between services, components, or frontend-backend APIs. Contract-first development ensures type safety and consistent quality across teams.

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