Codebase To Mermaid
This skill should be used when the user asks to "map this codebase", "draw a diagram of this repo", "generate a flow diagram", "make a mermaid diagram", "visualize this project", "show how this code flows", "what does this repo do", "diagram the architecture", "render a flowchart of this app", "sequence diagram of this endpoint", "class diagram of these models", "onboarding diagram", "produce a flow.mmd", or otherwise wants a validated Mermaid flow/sequence/class diagram of an arbitrary codebase with every node cited to a real file:line. Auto-detects archetype (HTTP service, CLI, data pipeline, SPA, Next.js, Nuxt, Remix, WordPress plugin/theme, WooCommerce, Laravel, Symfony, custom PHP, Spring Boot, ASP.NET Core, Go service/CLI, Rust web/CLI/WASM, Bash, WP-CLI, htmx, Alpine, Livewire, Vue SPA, C/C++/Qt/Unity, monorepo) and picks the right diagram kind. Writes raw Mermaid to flow*.mmd. Refuses to invent modules or decorative edges.
Security AStatic scan found no risk patternsHow grading works ›
From the source SKILL.md
Act as a codebase cartographer. Read an unfamiliar repository end-to-end and produce a Mermaid diagram that accurately represents how the system actually flows — not how its README claims it flows. Every node and edge traces to a real file. No invented modules. No decorative arrows.
What this skill does
Codebase To Mermaid is a community-contributed Claude Code skill in the backend sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/codebase-to-mermaid/ and loads when your prompt matches the skill's trigger.
Who uses this skill
The Codebase To Mermaid Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
How to install
Free
Manual install (2 steps)
mkdir -p ~/.claude/skills/codebase-to-mermaid
curl -L https://claudskills.com/skills/codebase-to-mermaid/SKILL.md \
-o ~/.claude/skills/codebase-to-mermaid/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/codebase-to-mermaid/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/codebase-to-mermaid/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\codebase-to-mermaid\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Telegram
📱 Install from your phone or desktop Telegram
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
Pro
One-click install via the desktop app
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
Pro
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Frequently asked questions
How do I install the Codebase To Mermaid Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy
SKILL.md from the source repository to
~/.claude/skills/codebase-to-mermaid/SKILL.md and restart Claude Code. Both flows are detailed at
claudskills.com/install/.
What does the Codebase To Mermaid skill do?
This skill should be used when the user asks to "map this codebase", "draw a diagram of this repo", "generate a flow diagram", "make a mermaid diagram", "visualize this project", "show how this code flows", "what does this repo do", "diagram the architecture", "render a flowchart of this app", "sequence diagram of this endpoint", "class diagram of these models", "onboarding diagram", "produce a flow.mmd", or otherwise wants a validated Mermaid flow/sequence/class diagram of an arbitrary codebase with every node cited to a real file:line. Auto-detects archetype (HTTP service, CLI, data pipeline, SPA, Next.js, Nuxt, Remix, WordPress plugin/theme, WooCommerce, Laravel, Symfony, custom PHP, Spring Boot, ASP.NET Core, Go service/CLI, Rust web/CLI/WASM, Bash, WP-CLI, htmx, Alpine, Livewire, Vue SPA, C/C++/Qt/Unity, monorepo) and picks the right diagram kind. Writes raw Mermaid to flow*.mmd. Refuses to invent modules or decorative edges.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Codebase To Mermaid skill?
Use Codebase To Mermaid when your Claude Code task falls under the Engineering category — specifically in the backend area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Codebase To Mermaid" or describe the task and let Claude pick). Browse related skills at
/category/engineering/.
What is a Claude Code skill and how does the Codebase To Mermaid skill fit in?
A Claude Code skill is a
SKILL.md file that lives under
~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Codebase To Mermaid is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at
/learn/what-is-a-claude-skill/.
Attribution & license
Cite this skill
If you reference this skill in a blog post, paper, or documentation, you can cite it as:
APA
chrismccoy. (2026). Codebase To Mermaid [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/codebase-to-mermaid/
BibTeX
@misc{codebase-to-mermaid-2026,
author = {chrismccoy},
title = {Codebase To Mermaid [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/codebase-to-mermaid/}
}Embed this skill
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Security scan
Grade A · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.
The scan flagged 1 of 10 categories (prompt-injection), including a high-severity pattern. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.
- ⚠ Prompt injection
- ✓ Data exfiltration
- ✓ Supply chain
- ✓ Reverse shell
- ✓ Credentials
- ✓ Execution
- ✓ Filesystem
- ✓ Persistence
- ✓ Obfuscation
- ✓ Network
Show this grade on your repo (click to copy):
[](https://claudskills.com/skills/codebase-to-mermaid/#security)
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