C4 Codebase Architecture
Helps an agent inspect a repository and produce C4 architecture documentation. Use this when reverse engineering a codebase, documenting system context, containers, components, or clarifying architecture from code and infrastructure.
Install
npx skills add lmammino/c4-codebase-architecture-skill --skill c4-codebase-architecturegit clone --depth 1 https://github.com/lmammino/c4-codebase-architecture-skill.git /tmp/c4-codebase-architecture-skill
mkdir -p ~/.claude/skills
cp -r /tmp/c4-codebase-architecture-skill/skills/c4-codebase-architecture ~/.claude/skills/c4-codebase-architecturePersonal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.
From the SKILL.md
# C4 Model Codebase Documentation Skill ## Purpose This skill helps an agent inspect a codebase and produce useful C4-style architecture documentation. It should combine evidence from the repository with targeted follow-up questions whenever code inspection alone is not enough to determine system boundaries, responsibilities, runtime topology, or business intent. The skill should be pragmatic rather than dogmatic. The goal is not to force every repository into a perfect set of four diagrams, but to produce the clearest possible architecture view at the right level of detail. --- ## When to use this skill Use this skill when the user wants to: * understand the architecture of an existing codebase * produce C4 documentation for a repository * generate a system context, container, or component view * onboard new engineers with architecture docs * reverse engineer system structure from code and infrastructure definitions * compare intended architecture with implemented architecture This skill works best when the repository includes at least some of the following: * source code * infrastructure as code * deployment descriptors * README or docs * API specifications * CI/CD configuration * test suites --- ## What this skill should produce The skill should aim to produce some or all of the following, depending on what the codebase supports: 1. **System Context** * the system under study * human users or personas
Details
- Skill name
c4-codebase-architecture- Repository
- lmammino/c4-codebase-architecture-skill
- Path
skills/c4-codebase-architecture/SKILL.md- License
- MIT
- Repo updated
- 9 April 2026
- Listed in
- heilcheng/awesome-agent-skills
FAQ
What does the C4 Codebase Architecture skill do?
Helps an agent inspect a repository and produce C4 architecture documentation. Use this when reverse engineering a codebase, documenting system context, containers, components, or clarifying architecture from code and infrastructure.
How do I install the C4 Codebase Architecture skill?
skills CLI (Claude Code, Cursor, Codex and more): npx skills add lmammino/c4-codebase-architecture-skill --skill c4-codebase-architecture. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.
Is C4 Codebase Architecture popular?
It lives in lmammino/c4-codebase-architecture-skill, which has 24 GitHub stars and 0 forks, and is included in 1 curated skill list.
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