Polyfills the ResizeObserver API and supports box size options from the latest spec
Connect Resize to Claude, Cursor or any other MCP client and it stops being a tab you switch to. Polyfills the ResizeObserver API and supports box size options from the latest spec. The resize mcp server is what makes that connection.
A minimal library which polyfills the ResizeObserver API and is entirely based on the latest Specification.
The toolset is worth reading before you wire it up, because it tells you what the integration is really for:
Desktop — The Desktop tool exposed by this serverMobile — **IE10 requires additional polyfills for WeakMap, MutationObserver and devicePixelRatio. IE9 requires IE10 polyfills plus requestAnimationFrameInstallation goes through your MCP client rather than a global install: point it at @juggle/resize-observer on npm and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. Resize's toolset — Desktop, Mobile — is a fair guide to whether it matches your workflow. It is maintained by trem; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against Resize's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| Desktop | The Desktop tool exposed by this server. |
| Mobile | \*\*IE10 requires additional polyfills for WeakMap, MutationObserver and devicePixelRatio. IE9 requires IE10 polyfills plus requestAnimationFrame. For more information, [see issue here](https://github.com/juggle/resize-o |
{
"mcpServers": {
"observer": {
"command": "npx",
"args": ["-y", "@juggle/resize-observer"]
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
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