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Mermaid Diagram Generator

Guide on creating and editing Mermaid charts safely. Use when asked to draw a diagram, flowchart, or architecture chart. Triggers on: 'mermaid', 'diagram', 'flowchart', 'visualize'.

shalomb Updated
Coding & Dev Tools

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Mermaid Skill

Use this skill to quickly validate Mermaid diagrams by parsing + rendering them with the official Mermaid CLI.

Prerequisites

  • Node.js + npm (for npx).
  • First run downloads a headless Chromium via Puppeteer. If Chromium is missing, set PUPPETEER_EXECUTABLE_PATH.

Tool

Validate a diagram

./tools/validate.sh diagram.mmd [output.svg]
  • Parses and renders the Mermaid source.
  • Non-zero exit = invalid Mermaid syntax.
  • Prints an ASCII preview using beautiful-mermaid (best-effort; not all diagram types are supported).
  • If output.svg is omitted, the SVG is rendered to a temp file and discarded.

Workflow (short)

  1. If the diagram will live in Markdown: draft it in a standalone diagram.mmd first (the tool only validates plain Mermaid files).
  2. Write/update diagram.mmd.
  3. Run ./tools/validate.sh diagram.mmd.
  4. Fix any errors shown by the CLI.
  5. Once it validates, copy the Mermaid block into your Markdown file.

shalomb/agent-skills/tree/main/skills/mermaid-diagram-generator commit 7af4707335

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Frequently asked questions

npx skillmds@latest add shalomb/mermaid-diagram-generator