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: Avoid space dash syntax which can cause incomplete renders: Node Labels with Special Characters Wrap labels containing special characters in quotes: 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: Or from a file: Alternative runtimes: This produces <output .svg in the current working directory. Step 3: Create HTML Wrapper Run the HTML wrapper script to prepare for screenshot: 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. For even higher resolution on complex diagrams, increase the viewport further or use the padding option when creating the HTML wrapper to give the diagram more space. Step 5: Clean Up Intermediary Files After rendering, remove all intermediary files. Only the final .svg and .png should remain. Files to clean up: The HTML wrapper file (e.g., diagram.html ) Any temporary .mmd files created to hold diagram code Any other files created during the rendering process If a temporary .mmd file was created, remove it as well. Output Both outputs are always produced: SVG : Vector format, infinitely scalable, small file size PNG : High resolution raster, captured at 4K (3840×2160) viewport with minimum 1200px diagram width Files are saved to the current working directory unless the user explicitly specifies a different path. Theme Selection Guide Theme Background Best For default Light grey General use dracula Dark purple Dark mode preference tokyo night Dark blue Modern dark aesthetic tokyo night storm Darker blue Higher contrast nord Dark arctic Muted, calm visuals nord light Light arctic Light mode with soft tones github dark GitHub dark Matches GitHub UI github light GitHub light Matches GitHub UI catppuccin latte Warm light Soft pastel aesthetic solarized Tan/cream Solarized colour scheme one dark Atom dark Atom editor aesthetic zinc dark Neutral dark Minimal, no colour bias Troubleshooting Theme not applied Check the render script output for the bg and fg values, or inspect the SVG's opening tag for bg and fg CSS custom properties. Diagram appears cut off or incomplete Check edge label syntax — use label pipe notation, not label Verify all node IDs are unique Check for unclosed brackets in node labels Render produces empty or malformed SVG Validate Mermaid syntax at https://mermaid.live before rendering Check for special characters that need escaping (wrap in quotes) Ensure flowchart direction is specified ( graph TD , graph LR , etc.)

beautiful-mermaid