Canvas
Skill by lura2
Install via CLI (Recommended)
clawhub install openclaw/skills/skills/lura2/canvasCanvas Skill
Display HTML content on connected OpenClaw nodes (Mac app, iOS, Android).
Overview
The canvas tool lets you present web content on any connected node's canvas view. Great for:
- Displaying games, visualizations, dashboards
- Showing generated HTML content
- Interactive demos
How It Works
Architecture
┌─────────────────┐ ┌──────────────────┐ ┌─────────────┐
│ Canvas Host │────▶│ Node Bridge │────▶│ Node App │
│ (HTTP Server) │ │ (TCP Server) │ │ (Mac/iOS/ │
│ Port 18793 │ │ Port 18790 │ │ Android) │
└─────────────────┘ └──────────────────┘ └─────────────┘
- Canvas Host Server: Serves static HTML/CSS/JS files from
canvasHost.rootdirectory - Node Bridge: Communicates canvas URLs to connected nodes
- Node Apps: Render the content in a WebView
Tailscale Integration
The canvas host server binds based on gateway.bind setting:
| Bind Mode | Server Binds To | Canvas URL Uses |
|---|---|---|
loopback | 127.0.0.1 | localhost (local only) |
lan | LAN interface | LAN IP address |
tailnet | Tailscale interface | Tailscale hostname |
auto | Best available | Tailscale > LAN > loopback |
Key insight: The canvasHostHostForBridge is derived from bridgeHost. When bound to Tailscale, nodes receive URLs like:
http://<tailscale-hostname>:18793/__openclaw__/canvas/<file>.html
This is why localhost URLs don't work - the node receives the Tailscale hostname from the bridge!
Actions
| Action | Description |
|---|---|
present | Show canvas with optional target URL |
hide | Hide the canvas |
navigate | Navigate to a new URL |
eval | Execute JavaScript in the canvas |
snapshot | Capture screenshot of canvas |
Configuration
In ~/.openclaw/openclaw.json:
{
"canvasHost": {
"enabled": true,
"port": 18793,
"root": "/Users/you/clawd/canvas",
"liveReload": true
},
"gateway": {
"bind": "auto"
}
}
Live Reload
When liveReload: true (default), the canvas host:
- Watches the root directory for changes (via chokidar)
- Injects a WebSocket client into HTML files
- Automatically reloads connected canvases when files change
Great for development!
Workflow
1. Create HTML content
Place files in the canvas root directory (default ~/clawd/canvas/):
cat > ~/clawd/canvas/my-game.html << 'HTML'
<!DOCTYPE html>
<html>
<head><title>My Game</title></head>
<body>
<h1>Hello Canvas!</h1>
</body>
</html>
HTML
2. Find your canvas host URL
Check how your gateway is bound:
cat ~/.openclaw/openclaw.json | jq '.gateway.bind'
Then construct the URL:
Metadata
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Find the right skillPaste this into your clawhub.json to enable this plugin.
{
"plugins": {
"official-lura2-canvas": {
"enabled": true,
"auto_update": true
}
}
}