Vercel AI SDK Fixes Tool Schema Property Preservation

Vercel has released a patch for its AI SDK, version @ai-sdk/xai@3.0.133, addressing an issue with the preservation of additionalProperties: false in tool schemas.

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Source · Sep 15, 2026, 5:18 PM · On Illumora · Sep 15, 2026, 5:23 PM

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Read the source →Vercel AI SDK Changelog — Release @ai-sdk/xai@3.0.133 · vercel/ai

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Vercel released a patch for its AI SDK, specifically version @ai-sdk/xai@3.0.133, on September 15.

Key Points

The release is identified as @ai-sdk/xai@3.0.133.
It was released on September 15.
The update includes a fix for the xai component.
The fix ensures the preservation of additionalProperties: false within tool schemas.
The specific patch change is identified by commit 8825c65.

Context

According to the Vercel AI SDK Changelog, this patch addresses a specific technical detail within the SDK's functionality. The fix targets the xai component, ensuring that a particular schema property, additionalProperties: false, is correctly maintained.

Why It Matters

For developers utilizing the Vercel AI SDK, this update ensures that tool schemas behave as expected, particularly regarding strict property definitions. Correct preservation of additionalProperties: false is important for maintaining data integrity and preventing unexpected inputs when defining tools for AI models.

What To Do

Developers using the Vercel AI SDK should note the @ai-sdk/xai@3.0.133 release.
Review your tool schemas if you rely on additionalProperties: false for strict validation.
Update your SDK to this version to incorporate the fix.
Test your existing tool implementations after updating to confirm expected behavior.