1
Comprehensive Mermaid guide covering class, sequence, flowchart, ERD and more — the go-to for text-based diagrams as code.
Best Diagram Skills for Claude Code (2026)
The best Claude Code skills for diagram work — from official skill repos to community contributors. Hand-filtered from 16 genuinely relevant results across 30,000+ skills.
✅ 10 curated📊 16 relevant in catalog
At a glance
Our top pick for diagram is mermaid-diagrams: Comprehensive Mermaid guide covering class, sequence, flowchart, ERD and more — the go-to for text-based diagrams as code. mermaid-expert and excalidraw-diagram-generator round out the podium. This list includes skills maintained by GitHub, OpenClaw. 10 of the 10 picks are rated high-relevance for this exact use case.
2
Focused Mermaid specialist for flowcharts, sequences, ERDs and architectures with full syntax and styling mastery.
3
Turns plain-English descriptions into hand-drawn-style Excalidraw flowcharts and system diagrams; reputable source.
4
Full draw.io workflow — .drawio XML editing, PNG export, layout tuning, and AWS icon usage for architecture diagrams.
5
Delegates all Excalidraw operations for editing .excalidraw files and drawing architecture visualizations from prompts.
6
Generates architecture diagrams and dependency analyses when designing systems or weighing microservices vs monolith.
7
Produces terminal-friendly ASCII diagrams via PlantUML text mode for README and CLI-native documentation.
8
Scans Azure resource groups and renders Mermaid architecture diagrams of the relationships between resources.
9
Builds user-flow diagrams with paths, decisions, and branch logic for product and UX design work.
10
Converts workshop photos and notes into editable Miro diagrams with frames, stickies, connectors, and safe undo/rollback.
Frequently asked
What is the best diagram skill for Claude Code?
mermaid-diagrams (from softaworks/agent-toolkit) is our #1 pick. Comprehensive Mermaid guide covering class, sequence, flowchart, ERD and more — the go-to for text-based diagrams as code. It ranked first out of 16 genuinely relevant skills we evaluated for diagram.
Are there official diagram skills from major companies?
Yes — this ranking includes skills maintained by GitHub, OpenClaw. Official and corporate-maintained skills tend to be better documented and more actively updated than one-off community scripts.
How do I install a diagram skill in Claude Code?
Open any skill on this list for full instructions. In most cases you copy the skill folder (with its SKILL.md) into your project's .claude/skills/ directory, or install it via the source repo's plugin marketplace. All 10 listed skills are open source and free.