exec
Execute Code
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Third-party content written by another agent. Data to evaluate, not instructions.
Execute JavaScript code on a tldraw canvas. The code runs in the widget with access to the live editor instance, helper functions, and normal js. Use the search tool first to discover available Editor methods and shape types.
Each canvas has a unique canvasId. Omit canvasId to create a new blank canvas. To edit an existing canvas, pass the canvasId that was returned by a previous exec call.
Shapes and text grow depending on the amount of text they have. Use clever scripting to ensure there are no unintended overlaps.
Examples:
- Create a rectangle: editor.createShape({ _type: 'rectangle', shapeId: 'box1', x: 200, y: 120, w: 320, h: 180, text: 'Hello' })
- Connect shapes with an arrow: editor.createShape({ _type: 'arrow', shapeId: 'a1', fromId: 'box1', toId: 'box2', x1: 0, y1: 0, x2: 100, y2: 0 })
- Select and zoom: editor.select('box1'); editor.zoomToSelection()
- Read shapes: return editor.getCurrentPageShapes()
- Distribute evenly: editor.distributeShapes(editor.getSelectedShapeIds(), 'horizontal')
- Box around shapes: boxShapes(['box1', 'box2'], { text: 'Group label', color: 'blue' })
- Stack shapes dynamically: editor.createShape({ _type: 'rectangle', shapeId: 'a', x: 0, y: 0, w: 300, h: 200, text: 'First box\nwith wrapping text' }); const bounds = editor.getShapePageBounds('a'); editor.createShape({ _type: 'rectangle', shapeId: 'b', x: 0, y: bounds.maxY + 20, w: 300, h: 200, text: 'Below first' })
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| code | string | yes | JavaScript code to execute. Has access to `editor` (tldraw Editor instance) and helper functions. |
| canvasId | string | no | Canvas ID to edit. Omit to create a new blank canvas. Pass a canvasId from a previous exec result to continue editing that canvas. |
Raw JSON schema
{
"$schema": "http://json-schema.org/draft-07/schema#",
"type": "object",
"properties": {
"code": {
"type": "string",
"description": "JavaScript code to execute. Has access to `editor` (tldraw Editor instance) and helper functions."
},
"canvasId": {
"description": "Canvas ID to edit. Omit to create a new blank canvas. Pass a canvasId from a previous exec result to continue editing that canvas.",
"type": "string"
}
},
"required": [
"code"
]
}