design-an-interface

Generate and compare multiple interface designs with trade-off analysis.

Updated Mar 6, 2026
One-click install
npx skills add https://github.com/sQVe/cape --skill design-an-interface-sqve
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: design-an-interface
Source: https://github.com/sQVe/cape/tree/main/skills/design-an-interface
Command: npx skills add https://github.com/sQVe/cape --skill design-an-interface-sqve

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Generate and compare multiple interface designs under conflicting constraints to determine the strongest API surface, module boundary, or type contract.

Core Features & Use Cases

  • Evaluate 3-4 competing designs with concrete signatures, usage examples, and trade-off analysis.
  • Provide a structured comparison across simplicity, depth, common-case ergonomics, flexibility, and implementation cost.
  • Deliver a final recommendation with rationale and potential ideas to reuse from rejected designs.

Quick Start

Provide three competing interface designs for a new API surface and a recommended one after evaluation.

Frequently Asked Questions about design-an-interface

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

FAQPage Schema
How do I design a robust API interface when facing conflicting constraints?▼

To design a robust API interface under conflicting constraints, evaluate multiple competing designs by comparing their concrete signatures, usage snippets, and trade-offs across simplicity, flexibility, and implementation cost to determine the strongest contract.

What is the best way to compare competing API designs for a new module boundary?▼

The best way to compare competing API designs for a module boundary is to generate 3-4 distinct options with language-specific signatures and perform a structured comparison evaluating common-case ergonomics, depth, and implementation cost before selecting a final recommendation.

How do you evaluate trade-offs when designing type contracts and module boundaries?▼

Evaluating trade-offs when designing type contracts involves assessing each competing design across simplicity, depth, flexibility, and implementation cost, then providing a final rationale that notes the strengths of the chosen interface and ideas reused from rejected designs.

Can I generate concrete usage snippets for different API surface designs?▼

Yes, you can generate concrete language-specific usage snippets for different API surface designs by crafting at least 3 distinct interface options, allowing you to directly compare their ergonomics and trade-offs before finalizing the module boundary.

Why should I create multiple competing designs before finalizing an interface contract?▼

Creating multiple competing designs before finalizing an interface contract forces you to evaluate conflicting constraints directly, ensuring the final API surface balances simplicity and flexibility while documenting the exact trade-offs that led to the recommendation.

When should I not use a single design approach for a new API surface?▼

You should not use a single design approach for a new API surface when conflicting constraints exist, because evaluating 3-4 distinct designs with concrete signatures is required to balance ergonomics, depth, and implementation cost effectively.