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Display HTML content on connected Moltbot nodes (Mac app, iOS, Android).
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| name | canvas |
| description | Display HTML content on connected Moltbot nodes (Mac app, iOS, Android). |
| capabilities | ["content_display","html_rendering"] |
Display HTML content on connected Moltbot nodes (Mac app, iOS, Android).
The canvas tool lets you present web content on any connected node's canvas view. Great for:
┌─────────────────┐ ┌──────────────────┐ ┌─────────────┐
│ Canvas Host │────▶│ Node Bridge │────▶│ Node App │
│ (HTTP Server) │ │ (TCP Server) │ │ (Mac/iOS/ │
│ Port 18793 │ │ Port 18790 │ │ Android) │
└─────────────────┘ └──────────────────┘ └─────────────┘
canvasHost.root directoryThe 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/__moltbot__/canvas/<file>.html
This is why localhost URLs don't work - the node receives the Tailscale hostname from the bridge!
| 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 |
In ~/.clawdbot/moltbot.json:
{
"canvasHost": {
"enabled": true,
"port": 18793,
"root": "/Users/you/clawd/canvas",
"liveReload": true
},
"gateway": {
"bind": "auto"
}
}
When liveReload: true (default), the canvas host:
Great for development!
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
Check how your gateway is bound:
cat ~/.clawdbot/moltbot.json | jq '.gateway.bind'
Then construct the URL:
http://127.0.0.1:18793/__moltbot__/canvas/<file>.htmlhttp://<hostname>:18793/__moltbot__/canvas/<file>.htmlFind your Tailscale hostname:
tailscale status --json | jq -r '.Self.DNSName' | sed 's/\.$//'
moltbot nodes list
Look for Mac/iOS/Android nodes with canvas capability.
canvas action:present node:<node-id> target:<full-url>
Example:
canvas action:present node:mac-63599bc4-b54d-4392-9048-b97abd58343a target:http://peters-mac-studio-1.sheep-coho.ts.net:18793/__moltbot__/canvas/snake.html
canvas action:navigate node:<node-id> url:<new-url>
canvas action:snapshot node:<node-id>
canvas action:hide node:<node-id>
Cause: URL mismatch between server bind and node expectation.
Debug steps:
cat ~/.clawdbot/moltbot.json | jq '.gateway.bind'lsof -i :18793curl http://<hostname>:18793/__moltbot__/canvas/<file>.htmlSolution: Use the full hostname matching your bind mode, not localhost.
Always specify node:<node-id> parameter.
Node is offline. Use moltbot nodes list to find online nodes.
If live reload isn't working:
liveReload: true in configThe canvas host serves from /__moltbot__/canvas/ prefix:
http://<host>:18793/__moltbot__/canvas/index.html → ~/clawd/canvas/index.html
http://<host>:18793/__moltbot__/canvas/games/snake.html → ~/clawd/canvas/games/snake.html
The /__moltbot__/canvas/ prefix is defined by CANVAS_HOST_PATH constant.
hide it or navigate away