codebase-design

Design deep modules with clean seams for refactoring and testability.

Updated Apr 8, 2026

Search Tags:#testing #architecture #refactoring #modularity #code-quality #design-patterns

Ready to run

npx skills add https://github.com/tonomb/personal-pnl --skill codebase-design-tonomb

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: codebase-design
Source: https://github.com/tonomb/personal-pnl/tree/main/.agents/skills/codebase-design
Command: npx skills add https://github.com/tonomb/personal-pnl --skill codebase-design-tonomb

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This skill addresses the common issue of shallow, tightly coupled codebases that are difficult to test, refactor, or navigate, by providing a shared architectural vocabulary and design methodology.

Core Features & Use Cases

Deepening Modules: Provides a systematic approach to identifying and deepening shallow modules to increase leverage and locality.
Seam Identification: Offers clear guidance on where to place seams to ensure code is testable and modular.
Design It Twice: Implements a parallel sub-agent pattern to explore and compare multiple interface designs before committing to an implementation.

Quick Start

Use the codebase-design skill to analyze the current module structure and propose a deeper interface for the payment processing logic.

Frequently Asked Questions about codebase-design

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

FAQPage Schema

How do I identify shallow modules to improve codebase architecture?▼

To improve codebase architecture, you identify shallow modules by analyzing structural leverage and locality, then systematically deepening module interfaces to increase testability and reduce coupling across complex codebases.

What is the best way to place seams for testable and modular code?▼

The best way to place seams for modular code is applying a standardized architectural framework that isolates dependencies, ensuring high leverage and clear boundaries for both testability and refactoring improvements.

How does the Design It Twice pattern work for interface design?▼

The Design It Twice pattern works by executing a parallel sub-agent pattern to explore and compare multiple interface designs simultaneously before committing to an implementation, ensuring optimal modularity.

Can I use this architectural framework for legacy code refactoring?▼

Yes, you can use this architectural framework for legacy code refactoring, as it provides a shared vocabulary and systematic methodology to deepen modules and improve maintainability across complex existing codebases.

When should I not use deep module refactoring on my codebase?▼

You should avoid deep module refactoring when your codebase lacks complex interface dependencies, as the architectural framework targets tightly coupled systems requiring structural leverage and seam identification improvements.