web-mcp-extending-excalidraw.vercel.app
A whiteboard that gets better when a human and an agent draw on it together.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 4 · Act 21 · Transact 0 · Score: Not yet scored
Tool inspector
update_elements
Change existing elements by id — move, resize, recolour, or retext them. Get ids from get_scene, get_selection or find_elements. To change only colours on several elements at once, restyle is simpler. Use this when you need to move or resize things. Example: {"updates":[{"id":"abc123","patch":{"x":400,"backgroundColor":"#ffec99"}}]}
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
updates |
array | yes | — |
Raw JSON schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"updates": {
"minItems": 1,
"type": "array",
"items": {
"type": "object",
"properties": {
"id": {
"type": "string"
},
"patch": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
},
"width": {
"type": "number"
},
"height": {
"type": "number"
},
"strokeColor": {
"type": "string"
},
"backgroundColor": {
"type": "string"
},
"fillStyle": {
"type": "string",
"enum": [
"hachure",
"cross-hatch",
"solid"
]
},
"strokeWidth": {
"type": "number"
},
"roughness": {
"type": "number"
},
"opacity": {
"type": "number",
"minimum": 0,
"maximum": 100
},
"angle": {
"type": "number"
},
"text": {
"description": "New text. Works on text elements and on a shape's bound label.",
"type": "string"
},
"fontSize": {
"type": "number"
}
}
}
},
"required": [
"id",
"patch"
]
}
}
},
"required": [
"updates"
],
"additionalProperties": false
}
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