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codebase-design

Design and refactor deep modules with interface and seam discipline.

Updated Jul 2, 2026
Search Tags:#interface design#module design#deep modules#testing strategies#seam management
One-click install
npx skills add https://github.com/nseluga/os --skill codebase-design-nseluga
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: codebase-design
Source: https://github.com/nseluga/os/tree/main/skills/codebase-design
Command: npx skills add https://github.com/nseluga/os --skill codebase-design-nseluga

SYSTEM DOCUMENTATION & REQUIREMENTS

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

What problem does it solve?

This Skill helps users design and improve module interfaces, identify deepening opportunities, and manage seams for testability and maintainability.

Core Features & Use Cases

  • Module Design Principles: Offers a comprehensive guide to creating deep modules with a small interface and rich implementation.
  • Seam Management: Assists in deciding where to place seams for effective behavior alteration without internal editing.
  • Testing Strategy: Provides strategies for testing deep modules through their interfaces, focusing on observable outcomes.

Quick Start

Implement a deep module design for a specific functionality, using the provided guidelines to determine the interface, implementation, and seam placement.

Frequently Asked Questions about codebase-design

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

FAQPage Schema
How do I design deep modules for better software maintainability?▼

Deep modules maximize software maintainability by providing a small interface that hides a rich implementation. This design reduces system complexity by exposing minimal functionality while encapsulating intricate internal behavior behind a simplified surface.

What is seam management in software architecture and testing?▼

Seam management in software architecture identifies specific locations where behavior can be altered without editing internal code. Effective seam placement enables developers to intercept and modify module interactions, facilitating robust testing strategies and improving overall system adaptability.

How do I test deep modules through their interfaces?▼

Testing deep modules through their interfaces involves validating observable outcomes rather than internal states. By interacting strictly with the exposed interface, developers can ensure the module's rich implementation behaves correctly under various conditions without coupling tests to internal details.

What's the best way to identify deepening opportunities during module refactoring?▼

Identifying deepening opportunities during module refactoring requires analyzing interface depth and seam discipline. Developers should look for modules with complex interfaces but shallow implementations, consolidating internal logic to simplify the external surface and enhance modularity.

When should I not use deep module design in software engineering?▼

Deep module design is not suitable when system components require highly transparent, granular control over internal states. If an architecture demands continuous shallow interactions or lacks clear boundaries, forcing deep modules may introduce unnecessary abstraction and hinder direct behavior alteration.

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