beautiful-mermaid Checked

Render Mermaid diagrams as SVG and PNG using the Beautiful Mermaid library. Use when the user asks to render a Mermaid diagram.

Beautiful Mermaid Diagram Rendering

Render Mermaid diagrams as SVG and PNG images using the Beautiful Mermaid library.

Render Mermaid diagrams as SVG and PNG using the Beautiful Mermaid library. Use when the user asks to render a Mermaid diagram.

Beautiful Mermaid Diagram Rendering

Render Mermaid diagrams as SVG and PNG images using the Beautiful Mermaid library.

Dependencies

This skill requires the agent-browser skill for PNG rendering. Load it before proceeding with PNG capture.

Supported Diagram Types

• **Flowchart** - Process flows, decision trees, CI/CD pipelines
• **Sequence** - API calls, OAuth flows, database transactions
• **State** - State machines, connection lifecycles
• **Class** - UML class diagrams, design patterns
• **Entity-Relationship** - Database schemas, data models

Available Themes

Default, Dracula, Solarized, Zinc Dark, Tokyo Night, Tokyo Night Storm, Tokyo Night Light, Catppuccin Latte, Nord, Nord Light, GitHub Dark, GitHub Light, One Dark.

If no theme is specified, use default.

Common Syntax Patterns

### Flowchart Edge Labels

Use pipe syntax for edge labels:

A -->|label| B
A ---|label| B

Avoid space-dash syntax which can cause incomplete renders:

A -- label --> B   # May cause issues

### Node Labels with Special Characters

Wrap labels containing special characters in quotes:

A["Label with (parens)"]
B["Label with / slash"]

Workflow

### Step 1: Generate or Validate Mermaid Code

If the user provides a description rather than code, generate valid Mermaid syntax. Consult references/mermaid-syntax.md for full syntax details.

### Step 2: Render SVG

Run the rendering script to produce an SVG file:

bun run scripts/render.ts --code "graph TD; A-->B" --output diagram --theme default

Or from a file:

bun run scripts/render.ts --input diagram.mmd --output diagram --theme tokyo-night

Alternative runtimes:

npx tsx scripts/render.ts --code "..." --output diagram
deno run --allow-read --allow-write --allow-net scripts/render.ts --code "..." --output diagram

This produces <output>.svg in the current working directory.

### Step 3: Create HTML Wrapper

Run the HTML wrapper script to prepare for screenshot:

bun run scripts/create-html.ts --svg diagram.svg --output diagram.html

This creates a minimal HTML file that displays the SVG with proper padding and background.

### Step 4: Capture High-Resolution PNG with agent-browser

Use the agent-browser CLI to capture a high-quality screenshot. Refer to the agent-browser skill for full CLI documentation.

# Set 4K viewport for high-resolution capture
agent-browser set viewport 3840 2160

# Open the HTML wrapper
agent-browser open "file://$(pwd)/diagram.html"

# Wait for render to complete
agent-browser wait 1000

# Capture full-page screenshot
agent-browser screenshot --full diagram.png

# Close browser
agent-browser close