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Compensate for viewport scrollbar width in size change notifications. On Linux/Windows, scrollbars consume space from the content area, causing a feedback loop where the iframe progressively shrinks to zero.

  • Use window.innerWidth - clientWidth to detect scrollbar width
  • Use max of getBoundingClientRect (CSS transforms) and scroll dimensions (content overflow) to report accurate size

🤖 Generated with Claude Code

Compensate for viewport scrollbar width in size change notifications.
On Linux/Windows, scrollbars consume space from the content area, causing
a feedback loop where the iframe progressively shrinks to zero.

- Use window.innerWidth - clientWidth to detect scrollbar width
- Use max of getBoundingClientRect (CSS transforms) and scroll dimensions
  (content overflow) to report accurate size

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@jonathanhefner jonathanhefner force-pushed the fix-iframe-resize-feedback-loop branch from d031221 to ecf3779 Compare December 1, 2025 17:39
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@ochafik ochafik left a comment

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Thanks Jonathan!

@ochafik ochafik merged commit 1cf95e5 into modelcontextprotocol:main Dec 1, 2025
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2 participants