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← AI PulseAug 19, 2026

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Vercel AI SDK Sandbox Update Allows Caller-Owned Sessions

Vercel has updated its AI SDK sandbox, allowing developers to pass a caller-owned sandbox session to HarnessAgent.createSession() and omit the sandbox argument from the HarnessAgent constructor.

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Source · Aug 19, 2026, 5:58 PM · On Illumora · Aug 19, 2026, 6:03 PM

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Read the source →Vercel AI SDK Changelog — Release @ai-sdk/sandbox-vercel@1.0.76 · vercel/ai
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On August 19, Vercel released version 1.0.76 of the @ai-sdk/sandbox-vercel package, which includes a new feature for managing sandbox sessions. This update allows for greater flexibility in how HarnessAgent instances are initialized and how sessions are created.

Key Points

  • The @ai-sdk/sandbox-vercel@1.0.76 package was released on August 19.
  • The update introduces a feature to pass a caller-owned sandboxSession to HarnessAgent.createSession().
  • This change allows the sandbox argument to be omitted from the HarnessAgent constructor when a caller-owned session is provided.
  • The @ai-sdk/harness package was also updated to version 1.0.76 as a dependency.

Context

According to Vercel, this patch change, identified as fc1970b, enhances the HarnessAgent's functionality within the AI SDK. It specifically addresses how sandbox sessions are managed during the creation of new sessions.

Why It Matters

This update offers developers more control over sandbox session management within the Vercel AI SDK, potentially simplifying the initialization of HarnessAgent and integrating custom session handling. This can lead to more streamlined development workflows and greater flexibility for builders.

What To Do

  • Review the updated documentation for HarnessAgent.createSession() and the HarnessAgent constructor.
  • Test passing a caller-owned sandboxSession in your existing @ai-sdk/sandbox-vercel implementations.
  • Note the updated dependency on @ai-sdk/harness@1.0.76.

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