Mermaid Diagrams

Generate .mmd text files and export to PNG/SVG/PDF using mmdc (local) or Kroki API (no install).

Key advantage: Text-based syntax with fully automatic layout — no x/y coordinates needed.

When to use / when NOT to use

Use this skill for: diagrams-as-code with automatic layout (flowchart, sequence, class, state, ER, gantt, mindmap) — text source that lives in git and embeds in Markdown.

Do NOT use it — route elsewhere — for:

• Pixel-precise placement, custom layout, branded icons, or heavy styling → drawio.
• A hand-drawn / sketchy aesthetic → excalidraw or tldraw.
• A freeform whiteboard or freehand strokes → tldraw.
• Strict, conventional UML notation → plantuml.

Prerequisites