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← AI PulseAug 17, 2026

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Vercel AI SDK HarnessAgent Now Supports Structured Output

The Vercel AI SDK has updated its HarnessAgent to include support for structured output via an output property, as part of the @ai-sdk/harness-pi@1.0.75 release on August 17.

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Read the source →Vercel AI SDK Changelog — Release @ai-sdk/harness-pi@1.0.75 · vercel/ai
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On August 17, the Vercel AI SDK released @ai-sdk/harness-pi@1.0.75, which introduces structured output support for its HarnessAgent. This enhancement is implemented through a new output property.

This update also affects other related packages. @ai-sdk/harness-opencode@1.0.74 and @ai-sdk/harness-grok-build@1.0.10 also reflect this change, indicating a broader integration of structured output capabilities across the harness components.

Key Points

  • The @ai-sdk/harness-pi@1.0.75 package was released on August 17.
  • HarnessAgent now supports structured output.
  • This functionality is exposed through an output property.
  • The change is noted as feat(harness): add support for structured output to HarnessAgent via output property.
  • @ai-sdk/harness@1.0.73 is an updated dependency.
  • @ai-sdk/harness-opencode@1.0.74 and @ai-sdk/harness-grok-build@1.0.10 also include this feature.

Context

According to the Vercel AI SDK changelog, the update 62a9c2a specifically adds structured output support to HarnessAgent. This feature is also present in the @ai-sdk/harness-opencode@1.0.74 and @ai-sdk/harness-grok-build@1.0.10 releases, indicating a consistent update across several harness-related packages. The @ai-sdk/harness package was updated to version 1.0.73 as a dependency.

Why It Matters

This update provides developers using the Vercel AI SDK with a standardized method for handling structured outputs from the HarnessAgent. This can simplify parsing and integration of AI model responses into applications, potentially reducing the need for custom parsing logic.

What To Do

  • Review the changelog for @ai-sdk/harness-pi@1.0.75 on GitHub.
  • Test the new output property with HarnessAgent in development environments.
  • Note the updated dependency on @ai-sdk/harness@1.0.73.
  • Compare the implementation across @ai-sdk/harness-opencode@1.0.74 and @ai-sdk/harness-grok-build@1.0.10 if using those packages.