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design-an-interface

Generate multiple radically different interface designs for a module using parallel sub-agents. Use when user wants to design an API, explore interface options, compare module shapes, or mentions "design it twice".

33,683stars2,642forksUpdated 4/28/2026

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About design-an-interface

The 'design-an-interface' skill helps software developers and architects generate multiple, radically different interface designs for a module. The main problem this skill addresses is the challenge of creating optimal, user-friendly interfaces while considering various constraints, such as performance or flexibility. This skill helps users explore various designs through a structured process that encourages the exploration of diverse options, ensuring a more well-rounded and informed design choice. It is based on the 'Design It Twice' philosophy from 'A Philosophy of Software Design,' which encourages testing multiple designs before settling on the best one.

The skill generates multiple design options by using parallel sub-agents that each follow different constraints and design philosophies. Each sub-agent produces a radically different design, considering various factors like minimizing the method count, maximizing flexibility, or optimizing for common use cases. The designs are then presented to the user with a detailed breakdown of each option's interface signature, usage examples, internal complexities, and trade-offs. This approach ensures that the user can evaluate different designs thoroughly before making a final decision. The ability to compare designs on simplicity, flexibility, efficiency, and depth ensures that the final choice is both optimal and well-suited to the primary use case.

Target users for this skill include software architects, developers, and designers who need to explore API or module design options. It's especially useful for teams working on large-scale systems where interface decisions have a significant long-term impact. It is also ideal for anyone involved in designing APIs or looking for ways to explore different interface structures for comparison.

FAQ

How do I use the 'design-an-interface' skill?

To use this skill, start by gathering the module's requirements, including the problem it solves, its key operations, and any constraints. Then, the skill generates multiple design options through parallel sub-agents, each following a different constraint or design approach. You will then review and compare these designs based on simplicity, flexibility, and implementation efficiency.

What types of designs does the skill generate?

The skill generates multiple, radically different interface designs for a module. Each design follows a unique constraint, such as minimizing the method count, maximizing flexibility, or optimizing for the most common use case.

Can I use this skill for any programming language?

The skill is designed to help generate interface designs for modules or APIs, regardless of the programming language. However, it focuses on the structure and design approach rather than specific language syntax, so the generated designs are more about principles than implementation in a particular language.

Does the skill help with implementation details?

No, the skill is focused purely on designing the interface, not on the implementation details. It helps users decide on the optimal structure and trade-offs of an interface but does not address the actual coding or implementation aspects.

What are the main limitations of this skill?

The primary limitation is that the skill does not provide guidance on the actual implementation or coding of the interfaces. It only helps with exploring and comparing interface designs and does not address specific technical constraints such as performance optimization during implementation.

Install design-an-interface

Download and extract the skill files to your .claude/skills/ directory.

Quick Setup:

  1. Copy the skill folder to .claude/skills/
  2. Claude will automatically detect and use the skill