Codebase Design

Codebase Design is an AI Engineering skill for Claude Code, published by romiluz13 in cc10x.

164 stars25 forkson romiluz13/cc10xAdded 2026/09/08Repository updated 2026/08/03

agent-harnessclaude-codeclaude-code-plugincontext-engineeringharness-engineeringllm-agentsloop-engineeringorchestrationtest-honesty

Install in seconds

Install Codebase Design

Copy Codebase Design into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/romiluz13/cc10x/tree/main/plugins/cc10x/skills/codebase-design ~/.claude/skills/codebase-design

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/romiluz13/cc10x.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: plugins/cc10x/skills/codebase-design/SKILL.md in romiluz13/cc10x
Installs to: ~/.claude/skills/codebase-design
Collection: One of 21 skills cataloged from this repository
Category: AI Engineering — 3670 skills

What Codebase Design does

Codebase Design defines vocabulary for shaping modules with small interfaces and deep implementations. Use it when designing seams, improving testability, or deciding whether an abstraction is shallow or deep.

Codebase Design is cataloged under AI Engineering on DirSkills. Codebase Design comes from a repository tagged agent-harness, claude-code, claude-code-plugin, context-engineering and harness-engineering.

Documentation

README

Excerpt

Codebase Design

Design deep modules: a lot of behaviour behind a small interface, placed at a clean seam, testable through that interface. Use this language and these principles wherever code is being designed or restructured. The aim is leverage for callers, locality for maintainers, and testability for everyone.

Glossary

Use these terms exactly — don't substitute "component," "service," "API," or "boundary." Consistent language is the whole point.

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Codebase Design

What else does romiluz13 publish alongside Codebase Design?
Codebase Design is one of 21 skills that DirSkills catalogs from romiluz13/cc10x, the repository it ships in. Its siblings there include Agent Common, Architecture and Building. Each one is a separate skill with its own page in this directory, installs the same way Codebase Design does, and is maintained by romiluz13 in that same repository. The rest of the collection is listed on the romiluz13/cc10x page.
How does Codebase Design compare to other AI Engineering skills?
Codebase Design ranks #3375 by stars among the 3670 AI Engineering skills in this catalog. The most-starred ones next to it are Architecture Decision Records, AI-First Engineering and Agentic OS. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Codebase Design against them. Open each page to compare what they document and how they install.