Themes are portable visual systems for Excalidraw diagrams: palette tokens, typography, element defaults, and optional layout instructions. Agents use the same theme contract that renderers use.

Bundled baseline theme. Friendly, general-purpose, and portable.

Editorial and book-grade. Strong for explainers and polished essays.

Rounded, off-white, workspace-style diagrams.

Low-fi and bright. Useful for brainstorming and collaborative sketches.

Inverted contrast for dark docs, talks, and technical dashboards.
Render with Node:
npx @excalidraw-skill-pack/render diagram.excalidraw --theme stripe-press
Create a custom theme with the theme scaffolder, or read the theme manifest spec.