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Rosetears520
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api-and-interface-design

Define typed API contracts, error semantics, and boundary validation before implementation.

2|Updated May 3, 2026
Search Tags:#versioning#error handling#api design#interface contracts#boundary validation#rest graphql
One-click install
npx skills add https://github.com/Rosetears520/aili-workflows --skill api-and-interface-design-rosetears520
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: api-and-interface-design
Source: https://github.com/Rosetears520/aili-workflows/tree/main/skills/api-and-interface-design
Command: npx skills add https://github.com/Rosetears520/aili-workflows --skill api-and-interface-design-rosetears520

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It solves the problem of fragile, inconsistent, or poorly defined interfaces that cause downstream breakage and misuse as your product evolves.

Core Features & Use Cases

  • Contract-first API design: Define typed inputs/outputs and interface behavior before implementation to reduce ambiguity and coupling.
  • Consistent error semantics: Standardize error formats and status-code mappings so consumers can reliably handle failures.
  • Boundary validation: Validate untrusted inputs and third-party responses only at system edges to keep internal logic clean and safe.
  • Backward-compatible evolution: Prefer additive changes over breaking modifications, aligning with real-world consumer expectations influenced by Hyrum's Law.

Quick Start

Use the api-and-interface-design skill to help you define a version-stable REST or GraphQL interface with typed contracts, consistent errors, and clear boundary validation for your new or changing endpoint.

Frequently Asked Questions about api-and-interface-design

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

FAQPage Schema
How do I design a stable REST or GraphQL API that doesn't break existing consumers?▼

Design a stable API by defining typed contracts and error semantics before implementation, preferring additive backward-compatible changes over breaking modifications to reduce consumer breakage risks.

What is boundary validation and when do I need it for API interface design?▼

Boundary validation in API interface design is the practice of validating untrusted inputs and third-party responses only at system edges to keep internal logic clean and safe.

How do I standardize error handling and status code mappings for my endpoints?▼

Standardize error handling by defining consistent error formats and status-code mappings during contract-first API design, ensuring consumers can reliably parse and handle failures across endpoints.

What's the best way to evolve an API version without causing downstream breakage?▼

The best way to evolve an API version without downstream breakage is to use additive backward-compatible changes, aligning modifications with real-world consumer expectations influenced by Hyrum's Law.

Does contract-first API design work for defining module boundaries and component props?▼

Yes, contract-first API design works for defining module boundaries and component prop interfaces by establishing explicit typing conventions and interface behavior before implementation.

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