Turn complex codebases into clear, navigable architecture diagrams with Claude Code.
# Add to your Claude Code skills
git clone https://github.com/oh-my-mermaid/oh-my-mermaidGuides for using cli tools skills like oh-my-mermaid.
Last scanned: 5/2/2026
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}oh-my-mermaid is an open-source cli tools skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by oh-my-mermaid. Turn complex codebases into clear, navigable architecture diagrams with Claude Code. It has 2,185 GitHub stars.
oh-my-mermaid returned warnings in SkillsLLM's automated security scan. It has no critical vulnerabilities, but review the flagged issues in the Security Report section before adding it to your workflow.
Clone the repository with "git clone https://github.com/oh-my-mermaid/oh-my-mermaid" and add it to your Claude Code skills directory (see the Installation section above).
oh-my-mermaid is primarily written in TypeScript. It is open-source under oh-my-mermaid on GitHub, so you can review or fork the full source.
Yes. SkillsLLM lists many other CLI Tools skills you can browse and compare side by side. Open the CLI Tools category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh oh-my-mermaid against similar tools.
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Paste this in your terminal:
npm install -g oh-my-mermaid && omm setup
Then open your AI coding tool and use the /omm-scan skill:
/omm-scan
That's it. View the result:
omm view
omm scanned itself. This is what it found.
Your AI analyzes the codebase and generates perspectives — different lenses on your architecture (structure, data flow, integrations...). Each perspective contains a Mermaid diagram and documentation fields.
Every node gets recursively analyzed. Complex nodes become nested child elements with their own diagrams. Simple ones stay as leaves. The filesystem reflects the tree:
.omm/
├── overall-architecture/ ← perspective
│ ├── description.md
│ ├── diagram.mmd
│ ├── context.md
│ ├── main-process/ ← nested element
│ │ ├── description.md
│ │ ├── diagram.mmd
│ │ └── auth-service/ ← deeper nesting
│ │ └── ...
│ └── renderer/
│ └── ...
├── data-flow/
└── external-integrations/
The viewer auto-detects nesting from the filesystem — elements with children render as expandable groups, others as nodes.
Each element carries up to 7 fields: description, diagram, context, constraint, concern, todo, note.
omm setup # Register skills with your AI tools
omm view # Open interactive viewer
omm config language ko # Set content language
omm update # Update to latest version
Run omm help for the full command list.
Skills are commands you run inside your AI coding tool (not the terminal). They start with /.
| Skill | What it does |
|---|---|
/omm-scan |
Analyze codebase → generate architecture docs |
/omm-push |
Login + link + push to cloud in one step |
You can store your architecture in the cloud via ohmymermaid.com.
omm login && omm link && omm push
It's private by default. Share with your team, or make it public like this example.
| Platform | Setup |
|---|---|
| Claude Code | omm setup claude |
| Codex | omm setup codex |
| Cursor | omm setup cursor |
| OpenClaw | omm setup openclaw |
| Antigravity | omm setup antigravity |
Run omm setup to auto-detect and configure all installed tools.
See docs/ROADMAP.md.
git clone https://github.com/oh-my-mermaid/oh-my-mermaid.git
cd oh-my-mermaid
npm install && npm run build
npm test
Issues and PRs welcome. Use Conventional Commits.