Render Mermaid diagrams as SVG and PNG using the Beautiful Mermaid library. Use when the user asks to render a Mermaid diagram.
npxskills add intellectronica/agent-skills--skill beautiful-mermaidLoading…
Render Mermaid diagrams as SVG and PNG images using the Beautiful Mermaid library.
This skill requires the agent-browser skill for PNG rendering. Load it before proceeding with PNG capture.
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.
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
Wrap labels containing special characters in quotes:
A["Label with (parens)"]
B["Label with / slash"]
If the user provides a description rather than code, generate valid Mermaid syntax. Consult references/mermaid-syntax.md for full syntax details.
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.
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.
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
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.
After rendering, remove all intermediary files. Only the final .svg and .png should remain.
Files to clean up:
diagram.html).mmd files created to hold diagram coderm diagram.html
If a temporary .mmd file was created, remove it as well.
Both outputs are always produced:
Files are saved to the current working directory unless the user explicitly specifies a different path.
| 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 |
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.
-->|label| pipe notation, not -- label -->graph TD, graph LR, etc.)| one-dark |
| Atom dark |
| Atom editor aesthetic |
| zinc-dark | Neutral dark | Minimal, no colour bias |
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