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The widget was calling `notifyIntrinsicHeight()` which is an OpenAI Apps
SDK method that doesn't exist on the MCP Apps bridge
(@modelcontextprotocol/ext-apps). This caused the height notification to
silently no-op, leaving the iframe stuck at a tiny auto-detected height.
Wrap the widget with `McpUseProvider autoSize` which uses ResizeObserver
to detect content height changes and sends them via the correct bridge
method (`bridge.sendSizeChanged({ height })`).
Co-authored-by: Cursor <[email protected]>
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Summary
McpUseProvider autoSizefor proper iframe height auto-sizingnotifyIntrinsicHeight()call which silently no-ops on MCP Apps bridgeProblem
The widget calls
appRef.current?.notifyIntrinsicHeight?.(height)to notify the host about its content height. However,notifyIntrinsicHeightis an OpenAI Apps SDK method that doesn't exist on the MCP Apps bridge (@modelcontextprotocol/ext-apps). The?.optional chain silently no-ops, so the iframe host never receives correct height information and the widget appears stuck at a tiny auto-detected height (~110px).Fix
Use
McpUseProviderfrommcp-use/reactwith theautoSizeprop, which:ResizeObserverbridge.sendSizeChanged({ height }))This is the recommended approach for mcp-use widgets and works with both MCP Apps and ChatGPT Apps SDK protocols.
Changes
resources/remotion-player/widget.tsx:McpUseProviderfrommcp-use/react<McpUseProvider autoSize>notifyIntrinsicHeightuseEffect (replaced by ResizeObserver auto-sizing)