easels.dev
A design canvas where you and your agent edit the same HTML, in the page. Agents read and write the nodes through WebMCP tools. No plugin, no desktop app.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 7 · Act 22 · Transact 1 · Score: Not yet scored
Tool inspector
write_html
Insert markup you already have. For building a page, screen or section from a description use generate_design instead; this is for a small component, a fix, or a logo. Write an HTML fragment into a parent and it becomes real nodes the person can then select and drag. Use inline style attributes for CSS. Flow layout works: a div with display:flex lays its children out for real, so prefer flex and grid over positioning every child by hand. Position the fragment root with position:absolute plus left and top to place it on the artboard. Semantic tags are kept, so use h1, p, button and a rather than divs everywhere. Returns the ids created and the boxes the browser laid them out at.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
parentId |
string | yes | Artboard or frame id to write into. |
html |
string | yes | An HTML fragment. May have several roots. |
mode |
string | no | append adds to the parent; replace swaps its children. Defaults to append. |
Raw JSON schema
{
"type": "object",
"properties": {
"parentId": {
"type": "string",
"description": "Artboard or frame id to write into."
},
"html": {
"type": "string",
"description": "An HTML fragment. May have several roots."
},
"mode": {
"type": "string",
"enum": [
"append",
"replace"
],
"description": "append adds to the parent; replace swaps its children. Defaults to append."
}
},
"required": [
"parentId",
"html"
]
}
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