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Vercel AI SDK Updates Address Gemini Tool Output and JSON Schema Handling

Vercel has released updates to its AI SDK, including version @ai-sdk/google@4.0.70, to address issues with Gemini tool output serialization and JSON Schema preservation.

By Illumora Editorial

Source · Sep 15, 2026, 4:12 AM · On Illumora · Sep 15, 2026, 4:24 AM

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Read the source →Vercel AI SDK Changelog — Release @ai-sdk/sandbox-vercel@1.0.111 · vercel/ai
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Vercel has issued updates to its AI SDK, with @ai-sdk/sandbox-vercel@1.0.111, @ai-sdk/vue@4.0.101, @ai-sdk/svelte@5.0.101, and @ai-sdk/tui@1.0.102 among the packages receiving changes. These releases include fixes for how tool output JSON values are serialized and how Gemini tool responses are handled.

Key Points

  • The @ai-sdk/google@4.0.70 package now preserves JSON Schema instead of converting it to OpenAPI schema.
  • A fix addresses an issue where Gemini would close the socket with code 1007 if a non-object tool result was sent unwrapped.
  • The functionResponse.response field for Gemini is now maintained as an object, aligning with its google.protobuf.Struct typing.
  • Non-object tool results are now wrapped under an output key before transmission to Gemini.
  • The core ai package, version 7.0.101, includes a fix for serializing tool output JSON values.

Context

According to Vercel, the updates specifically target interactions with Gemini, where the google.protobuf.Struct type for functionResponse.response expects an object. Previously, onToolCall returning unknown and addToolOutput accepting unknown could lead to non-object results (such as strings, numbers, arrays, or null) being sent unwrapped, causing Gemini to terminate the connection.

Why It Matters

These updates improve the reliability of tool use with Gemini models within the Vercel AI SDK, ensuring that tool outputs are correctly formatted and transmitted. This change can prevent unexpected disconnections and improve the stability of applications integrating Gemini through the SDK.

What To Do

  • Developers using the Vercel AI SDK with Gemini should update to @ai-sdk/google@4.0.70 or later.
  • Review applications that handle tool outputs to ensure compatibility with the new serialization behavior.
  • Note that non-object tool results are now encapsulated within an output key.

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/atlas/**gemini**-family /techniques/output-schema