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.