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Diagram

Diagram is an agent skill (a SKILL.md file) from Yeachan-Heo/oh-my-claudecode. Use the smallest visual when prose must carry structure—control flow, call depth, module ownership, or change shape: pseudocode, call tree, component/file tree, Mermaid diagram, or… It works with Claude Code, Codex, Cursor, Gemini CLI and OpenCode and has 40,654 GitHub stars across a repository of 7 listed skills.

github.com/Yeachan-Heo/oh-my-claudecode/skills/diagram (opens in a new tab)

Data as of from the GitHub API; description from the skill's SKILL.md. Report an error

View on GitHub (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add Yeachan-Heo/oh-my-claudecode
/plugin install oh-my-claudecode@omc

In the Claude apps, zip the diagram folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/Yeachan-Heo/oh-my-claudecode.git
cp -r oh-my-claudecode/skills/diagram .agents/skills/diagram   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/Yeachan-Heo/oh-my-claudecode.git
cp -r oh-my-claudecode/skills/diagram .cursor/skills/diagram   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Use the smallest visual when prose must carry structure—control flow, call depth, module ownership, or change shape: pseudocode, call tree, component/file tree, Mermaid diagram, or diff. Skip it when prose already answers the question. Diagrams are load-bearing, not decoration. Reach for one only when prose forces the reader to hold a whole shape in their head at once — then pick the smallest view that lets them see the shape instead of reconstructing it from sentences.

When it triggers

  • Use the smallest visual when prose must carry structure—control flow, call depth, module ownership, or change shape: pseudocode, call tree, component/file tree, Mermaid diagram, or diff.

More skills in Yeachan-Heo/oh-my-claudecode

7 skills are listed from this repository.

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FAQ

Diagram FAQ

Still curious? Email info@appsgit.com.

How do I install the Diagram skill?

In Claude Code, run /plugin marketplace add Yeachan-Heo/oh-my-claudecode and then /plugin install oh-my-claudecode@omc. For Codex or Cursor, copy the diagram folder into .agents/skills/ or .cursor/skills/.

Is the Diagram skill free?

Yes. The repository is open source under the MIT license.

Is Diagram maintained?

The repository's most recent commit was on Nov 3, 2026. Its latest release is v5.7.30. appsgit only lists skills from repositories with a commit in the last six months.