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api-and-interface-design

Design stable APIs and interfaces using Hyrum's Law and The One-Version Rule.

Updated Jun 22, 2026
Search Tags:#api design#graphql#interface design#rest api#hyrum's law
One-click install
npx skills add https://github.com/J03Fr0st/mithril --skill api-and-interface-design-j03fr0st
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: api-and-interface-design
Source: https://github.com/J03Fr0st/mithril/tree/main/skills/api-and-interface-design
Command: npx skills add https://github.com/J03Fr0st/mithril --skill api-and-interface-design-j03fr0st

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill ensures stable and secure API and interface development, making it easier to create reliable, well-documented interfaces for APIs, module boundaries, and other public interfaces.

Core Features & Use Cases

  • Guides for API and Interface Design: Provides principles and best practices for designing stable APIs and interfaces.
  • Documentation of Design Principles: Offers guidelines for implementing Hyrum's Law, The One-Version Rule, and more.
  • Use Case: Use this Skill to design REST or GraphQL endpoints, define module boundaries, and create component prop interfaces, ensuring your APIs and interfaces are hard to misuse and maintain.

Quick Start

Run the api-and-interface-design skill to learn how to design your APIs and interfaces with the core principles of stable design in mind.

Frequently Asked Questions about api-and-interface-design

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

FAQPage Schema
What is Hyrum's Law and how does it affect API design?▼

Hyrum's Law states that all observable behaviors of an API will eventually be depended on by users. This Skill provides design principles to mitigate this risk, ensuring your API and interface design remains stable and maintainable even as dependencies evolve.

How do I design REST and GraphQL endpoints that are hard to misuse?▼

To design REST and GraphQL endpoints that are hard to misuse, this Skill applies principles like The One-Version Rule. It guides you in defining strict module boundaries and component prop interfaces for secure, reliable integration.

What is the best way to define module boundaries for maintainable software?▼

The best way to define module boundaries is by following stability principles like The One-Version Rule. This Skill helps you establish well-documented interfaces that ensure secure, reliable separation between modules for long-term maintainability.

Can I use these interface design guidelines for component prop interfaces?▼

Yes, you can use these interface design guidelines for component prop interfaces. The principles provided ensure your component boundaries are well-documented, stable, and hard to misuse across your software engineering projects.

Why does my API break when I update internal dependencies?▼

Your API likely breaks because internal dependencies have implicit contracts, a phenomenon explained by Hyrum's Law. This Skill helps you design reliable interfaces that isolate these changes and maintain strict API stability.

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