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codebase-design

Design deep modules with small interfaces and high leverage.

Updated Aug 27, 2026
Search Tags:#architecture#testability#adapters#seams#deep-modules#codebase-design
One-click install
npx skills add https://github.com/meisijiya/ohMeisijiyaCode --skill codebase-design-meisijiya
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: codebase-design
Source: https://github.com/meisijiya/ohMeisijiyaCode/tree/main/skills/codebase-design
Command: npx skills add https://github.com/meisijiya/ohMeisijiyaCode --skill codebase-design-meisijiya

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps you design modules with small, high-leverage interfaces so complex code stays easy to understand, test, and change.

Core Features & Use Cases

  • Deep module design: Shape a module so a caller learns a small interface while getting a lot of behaviour in return.
  • Seam and adapter planning: Decide where the seam should live and which adapters belong behind it for production and testing.
  • Alternative interface exploration: Compare different interface shapes before committing to a refactor, especially when the first idea may be too shallow.
  • Use case: When a package mixes business logic, I/O, and test complexity, this Skill helps you reorganize it into a cleaner module with better locality and testability.

Quick Start

Use the codebase-design skill to analyze one module in my codebase and recommend a deeper interface with a clean seam.

Frequently Asked Questions about codebase-design

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

FAQPage Schema
What is a deep module in software architecture?▼

A deep module features a small interface that hides a large amount of implementation, giving callers high leverage. This design keeps complex code easy to understand, test, and change.

How do I design clean seams for better testability?▼

To design clean seams for testability, place the seam where you can inject adapters for production and testing. This separates business logic from I/O, improving locality and maintainability.

How do I refactor a package that mixes business logic and I/O?▼

Refactor mixed packages by reorganizing them into deep modules with clean seams. Compare alternative interface shapes to find the highest leverage design, then place adapters behind the seam.

When should I compare alternative interfaces before committing to a refactor?▼

Compare alternative interfaces when your first refactoring idea feels too shallow. Exploring different shapes helps ensure the final module achieves high leverage, locality, and testability.

Can I use this approach to evaluate module depth and leverage?▼

Yes, you can evaluate module depth and leverage by analyzing interface size against hidden implementation. This approach ensures your architecture produces testable and maintainable designs.

Why does my module design lack testability and locality?▼

Module design lacks testability and locality when interfaces are too shallow and seams are misplaced. Shaping deep modules with clean seams and adapters separates concerns and restores maintainability.

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