AI Briefing
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Sandbox SDK adds file permission control

·2026.03.20 09:00

Key point

Vercel Sandbox SDK 1.9.0 now directly supports setting file permissions in writeFiles.

Details

In Vercel Sandbox SDK 1.9.0, permissions can now be set directly using the mode property when writing files. Passing this value to the writeFiles API lets you complete file creation and permission setting in a single operation.

Previously, a separate chmod execution was required when creating executable scripts or adjusting access permissions inside a sandbox. With this change, that extra round-trip is eliminated, making the workflow simpler.

More details can be found in the Vercel Sandbox SDK reference in the documentation.

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