imxv/Pretty-mermaid-skills

AI Agent Skill to generate and render beautiful Mermaid diagrams as SVG or terminal ASCII — 15 themes, 6 diagram types, batch CLI, no browser.

JavaScript

1,529

10 commits

updated Aug 22, 2026

See the code

README

Pretty Mermaid

Beautiful Mermaid diagrams for AI agents

Turn Mermaid source into polished SVGs, shareable PNGs, and terminal-ready ASCII—locally, without a browser.

Pretty Mermaid converts Mermaid source into themed SVG, PNG, and terminal ASCII diagrams

skills.sh CI License: MIT Node.js Version GitHub stars

English | 中文 | 日本語

🚀 Install

npx skills add imxv/pretty-mermaid-skills@pretty-mermaid -g -y

View the skill, install count, and security audits on skills.sh →

Why Pretty Mermaid?

  • Made for AI agents: works with Claude Code, Cursor, Codex, Gemini CLI, and more
  • One source, three outputs: polished SVG for docs, PNG for sharing, and ASCII/Unicode for terminals
  • No browser required: renders locally without Chromium, Puppeteer, or a DOM
  • Flexible by default: 15 themes, custom colors, six diagram types, and batch rendering

✨ Features

  • 📊 Multi-format Support: SVG, PNG, and ASCII rendering export
  • 🎨 Rich Themes: 15 built-in themes for different scenarios
  • 📈 Six Diagram Types: Flowchart, Sequence, State, Class, ER, and XY charts
  • ⚡ High Performance: Batch parallel rendering
  • 📚 Ready to Use: Complete templates and detailed documentation

Supported Themes

Light ThemesDark ThemesOther
zinc-lightzinc-darknord
tokyo-night-lighttokyo-nightnord-light
catppuccin-lattetokyo-night-stormdracula
github-lightcatppuccin-mochaone-dark
solarized-lightgithub-dark
solarized-dark

Compare the same flowchart across every built-in theme in the complete 15-theme gallery.

Tokyo Night theme preview GitHub Light theme preview

🤖 AI Assistant Integration

Seamlessly integrates with the following AI coding environments:

  • Claude Code
  • Cursor
  • Gemini CLI
  • Antigravity
  • OpenCode
  • Codex
  • qoder

Installation details

Install from GitHub

npx skills add imxv/pretty-mermaid-skills@pretty-mermaid -g -y

Verify Installation

npx skills list -g

Confirm that pretty-mermaid appears in the global skill list. Node.js 16 or newer is required.

📖 Quick Start

List Available Themes

node scripts/themes.mjs

Render Single Diagram

node scripts/render.mjs \
  --input diagram.mmd \
  --output output.svg \
  --theme tokyo-night

Render PNG

node scripts/render.mjs \
  --input diagram.mmd \
  --output output.png \
  --format png \
  --width 1200 \
  --theme tokyo-night

Batch Render

node scripts/batch.mjs \
  --input-dir ./diagrams \
  --output-dir ./output \
  --theme dracula

📂 Examples

Check the 6 template files in assets/example_diagrams/:

  • flowchart.mmd - Flowchart
  • sequence.mmd - Sequence Diagram
  • state.mmd - State Diagram
  • class.mmd - Class Diagram
  • er.mmd - ER Diagram
  • xychart.mmd - XY Chart (bar and line)

PNG output is rendered directly in Node.js with no external converter required. The renderer also supports CJK state names, multiline labels, linkStyle, configurable ELK layout spacing, interactive XY chart tooltips, and ANSI-colored terminal output.

📚 Documentation

🤝 Community

Read the contribution guide, report problems with the issue templates, and review the security policy before sharing sensitive findings. Release history is tracked in the changelog.

⚙️ Requirements

  • Node.js 16+

📄 License

MIT License

Star History

Star History Chart

🙏 Acknowledgments

Based on beautiful-mermaid

agent-skills
ai-agents
ascii-art
claude-code
codex
cursor
diagram-generator
documentation
flowchart
mermaid
mermaid-diagram
skills
svg

imxv/Pretty-mermaid-skills

AI Agent Skill to generate and render beautiful Mermaid diagrams as SVG or terminal ASCII — 15 themes, 6 diagram types, batch CLI, no browser.

JavaScript

1,529

10 commits

updated Aug 22, 2026

See the code

README

Pretty Mermaid

Beautiful Mermaid diagrams for AI agents

Turn Mermaid source into polished SVGs, shareable PNGs, and terminal-ready ASCII—locally, without a browser.

Pretty Mermaid converts Mermaid source into themed SVG, PNG, and terminal ASCII diagrams

skills.sh CI License: MIT Node.js Version GitHub stars

English | 中文 | 日本語

🚀 Install

npx skills add imxv/pretty-mermaid-skills@pretty-mermaid -g -y

View the skill, install count, and security audits on skills.sh →

Why Pretty Mermaid?

  • Made for AI agents: works with Claude Code, Cursor, Codex, Gemini CLI, and more
  • One source, three outputs: polished SVG for docs, PNG for sharing, and ASCII/Unicode for terminals
  • No browser required: renders locally without Chromium, Puppeteer, or a DOM
  • Flexible by default: 15 themes, custom colors, six diagram types, and batch rendering

✨ Features

  • 📊 Multi-format Support: SVG, PNG, and ASCII rendering export
  • 🎨 Rich Themes: 15 built-in themes for different scenarios
  • 📈 Six Diagram Types: Flowchart, Sequence, State, Class, ER, and XY charts
  • ⚡ High Performance: Batch parallel rendering
  • 📚 Ready to Use: Complete templates and detailed documentation

Supported Themes

Light ThemesDark ThemesOther
zinc-lightzinc-darknord
tokyo-night-lighttokyo-nightnord-light
catppuccin-lattetokyo-night-stormdracula
github-lightcatppuccin-mochaone-dark
solarized-lightgithub-dark
solarized-dark

Compare the same flowchart across every built-in theme in the complete 15-theme gallery.

Tokyo Night theme preview GitHub Light theme preview

🤖 AI Assistant Integration

Seamlessly integrates with the following AI coding environments:

  • Claude Code
  • Cursor
  • Gemini CLI
  • Antigravity
  • OpenCode
  • Codex
  • qoder

Installation details

Install from GitHub

npx skills add imxv/pretty-mermaid-skills@pretty-mermaid -g -y

Verify Installation

npx skills list -g

Confirm that pretty-mermaid appears in the global skill list. Node.js 16 or newer is required.

📖 Quick Start

List Available Themes

node scripts/themes.mjs

Render Single Diagram

node scripts/render.mjs \
  --input diagram.mmd \
  --output output.svg \
  --theme tokyo-night

Render PNG

node scripts/render.mjs \
  --input diagram.mmd \
  --output output.png \
  --format png \
  --width 1200 \
  --theme tokyo-night

Batch Render

node scripts/batch.mjs \
  --input-dir ./diagrams \
  --output-dir ./output \
  --theme dracula

📂 Examples

Check the 6 template files in assets/example_diagrams/:

  • flowchart.mmd - Flowchart
  • sequence.mmd - Sequence Diagram
  • state.mmd - State Diagram
  • class.mmd - Class Diagram
  • er.mmd - ER Diagram
  • xychart.mmd - XY Chart (bar and line)

PNG output is rendered directly in Node.js with no external converter required. The renderer also supports CJK state names, multiline labels, linkStyle, configurable ELK layout spacing, interactive XY chart tooltips, and ANSI-colored terminal output.

📚 Documentation

🤝 Community

Read the contribution guide, report problems with the issue templates, and review the security policy before sharing sensitive findings. Release history is tracked in the changelog.

⚙️ Requirements

  • Node.js 16+

📄 License

MIT License

Star History

Star History Chart

🙏 Acknowledgments

Based on beautiful-mermaid

agent-skills
ai-agents
ascii-art
claude-code
codex
cursor
diagram-generator
documentation
flowchart
mermaid
mermaid-diagram
skills
svg

Significant stargazers

Thorsten Lünborg

2,582 followers · starred Aug 2026

Nathan Flurry

625 followers · starred Apr 2026

Yakko Majuri

189 followers · starred Feb 2026

Mohamed EL HAJJAJI

1 followers · starred Sep 2026