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MCP App UI causes chat to be jittery on mobile but not on desktop

OpenAI Developer Community May 8, 2026
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Figured this out. I was inadvertently setting a min height on the UI to 100%. I’m guessing that was being used to determine the size of the iframe and was probably leading to a weird feedback loop causing continuous resizing. Removed that and it works now. Sharing in case anyone else makes this mistake.

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