Set _meta['openai/widgetPrefersBorder']

[jerelmiller]

At the moment it seems like ChatGPT ignores _meta.ui.prefersBorder but honors _meta['openai/widgetPrefersBorder'] so this PR makes sure its set when rendering an OpenAI app.

[apollo-librarian]

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Build ID: 6b87516b491733b5d473a061
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[github-actions]

✅ Changeset file added - thank you!

[claude]

Review Summary

This PR adds openai/widgetPrefersBorder metadata as a workaround for ChatGPT ignoring the standard _meta.ui.prefersBorder field. The implementation is clean, follows existing patterns in the codebase (similar to the CSP workaround), and includes comprehensive test coverage.

Update: The author has addressed all previous feedback by adding an explanatory comment (lines 134-135) that documents why this OpenAI-specific field is needed.

Code Quality: ✅ Excellent

• Security: No issues - proper use of unwrap_or_default(), no unsafe blocks
• Performance: No concerns - no unnecessary allocations or clones
• Correctness: Follows existing architectural patterns, idiomatic Rust code
• Error Handling: Appropriate and consistent with codebase standards

Test Coverage: ✅ Comprehensive

• Line 258: Positive case verifies AppsSDK target includes openai/widgetPrefersBorder
• Line 328: Negative case verifies MCPApps target does not include it
• Both scenarios properly validated

Documentation: ✅ Clear

• Lines 134-135: Explanatory comment documents the ChatGPT compatibility issue
• Comment clearly explains this is a temporary workaround

Final Recommendation: ✅ Approve

The code is correct, well-tested, properly documented, and follows Rust best practices. All previous feedback has been addressed. Ready to merge.

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Reviewed by Claude Code Sonnet 4.5

[DaleSeo]

just a missing closing quote