Diagram Design
Diagram Design is an agent skill (a SKILL.md file) from cathrynlavery/diagram-design. Create branded architecture, architecture delta, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, polar chart (polar/radial lollipop). It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 44,165 GitHub stars.
github.com/cathrynlavery/diagram-design/skills/diagram-design (opens in a new tab)
- Plugin marketplace
- Design & frontend
- Actively maintained
Add this skill
Claude
This repository is a Claude Code plugin marketplace. In Claude Code:
/plugin marketplace add cathrynlavery/diagram-design
/plugin install diagram-design@diagram-designIn the Claude apps, zip the diagram-design 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/cathrynlavery/diagram-design.git
cp -r diagram-design/skills/diagram-design .agents/skills/diagram-design # repo; ~/.agents/skills for all projectsStandalone 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/cathrynlavery/diagram-design.git
cp -r diagram-design/skills/diagram-design .cursor/skills/diagram-design # project; ~/.cursor/skills for all projectsSource (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
Create branded architecture, architecture delta, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, polar chart (polar/radial lollipop), loop/flywheel, nested, tree, org chart, layer stack, exploded axonometric, axonometric plan, Venn, pyramid/funnel, treemap and marimekko, heatmap, bar and dumbbell, waterfall, line (slopegraph, ridgeline, streamgraph, bump), Gantt and scatter charts (bubble, beeswarm), high-level, process,…
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What is the Diagram Design skill?
Diagram Design is an agent skill (a SKILL.md file) from cathrynlavery/diagram-design. Create branded architecture, architecture delta, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, polar chart (polar/radial lollipop). It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 44,165 GitHub stars. Its SKILL.md lives at github.com/cathrynlavery/diagram-design/skills/diagram-design.
How do I install the Diagram Design skill?
In Claude Code, run /plugin marketplace add cathrynlavery/diagram-design and then /plugin install diagram-design@diagram-design. For Codex or Cursor, copy the diagram-design folder into .agents/skills/ or .cursor/skills/.
Is the Diagram Design skill free?
Yes. The repository is open source under the MIT license.
Is Diagram Design maintained?
The repository's most recent commit was on Oct 6, 2026. appsgit only lists skills from repositories with a commit in the last six months.