Visual HTML canvas sandbox for agent-driven UI and live previews
64
52%
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
Passed
No known issues
Optimize this skill with Tessl
npx tessl skill review --optimize ./src/skills/bundled/sandbox/SKILL.mdPush HTML content to a live-updating canvas server for visual previews, dashboards, and agent-driven UI.
/sandbox start - Start the canvas server (returns URL)
/sandbox push <html> - Push HTML content to the canvas
/sandbox reset - Reset canvas to blank state
/sandbox screenshot - Take a screenshot of the current canvas
/sandbox status - Show canvas server status and settings| Variable | Description |
|---|---|
CANVAS_ALLOW_JS_EVAL | Enable JavaScript evaluation in canvas (default: false) |
ALLOW_UNSAFE_SANDBOX | Enable unsafe sandbox mode (default: false) |
/sandbox start
/sandbox push <h1>Hello World</h1><p>Live preview</p>
/sandbox screenshot
/sandbox status
/sandbox reset/sandbox start launches a local HTTP server that serves the canvas page/sandbox push <html> sends HTML to the canvas, rendered in real time/sandbox screenshot captures the current canvas state as an image/sandbox reset clears all HTML, CSS, and JS from the canvas/sandbox status shows whether the server is running, the URL, and content sizes2a8c94e
If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.