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Vercel AI SDK Adds Fish Audio Provider, Enhances ToolLoopAgent and Instruction Handling

The Vercel AI SDK has introduced a new Fish Audio provider for speech and transcription models, alongside updates to its ToolLoopAgent and language model instruction handling.

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Source · Aug 6, 2026, 12:58 AM · On Illumora · Aug 6, 2026, 1:08 AM

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Read the source →Vercel AI SDK Changelog — Release @ai-sdk/xai@4.0.29 · vercel/ai
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The Vercel AI SDK has released several updates, including the addition of a Fish Audio provider. This new provider supports both speech and transcription models. The updates also include enhancements to the ToolLoopAgent and improved mechanisms for managing language model instructions.

Key Points

  • The Vercel AI SDK now includes a Fish Audio provider, supporting speech and transcription models, as noted in the @ai-sdk/fish-audio@3.0.0 release.
  • ToolLoopAgent prepareCall callbacks can now read and override the top-level reasoning option, according to the ai@7.0.54 patch changes.
  • A defaultInstructionsMiddleware has been added to apply default language model instructions while preserving call-level overrides.
  • Preceding assistant messages are now preserved when regenerating a response.
  • The @ai-sdk/anthropic@4.0.32 package rejects spliced Anthropic generations but allows duplicate message start events for the active message.

Context

According to the Vercel AI SDK Changelog, these updates are part of routine releases managed by a Changesets release GitHub action. This action automates the publishing of packages to npm when a release is ready. The changes span multiple packages within the Vercel AI SDK, including @ai-sdk/xai@4.0.29, @ai-sdk/svelte@5.0.54, @ai-sdk/togetherai@3.0.25, and @ai-sdk/tui@1.0.55, all of which reflect the same core updates.

Why It Matters

These updates provide developers using the Vercel AI SDK with new capabilities for audio processing and more granular control over how language models are instructed and how their responses are managed. The enhancements to instruction handling and message preservation can lead to more robust and predictable AI application behavior.

What To Do

  • Review the Vercel AI SDK documentation for details on integrating the new Fish Audio provider.
  • Test the ToolLoopAgent prepareCall callbacks to understand how to read and override reasoning options.
  • Implement defaultInstructionsMiddleware to manage language model instructions consistently across applications.
  • Note the behavior of preceding assistant messages when regenerating responses to ensure expected conversational flow.
  • Developers using @ai-sdk/anthropic should be aware of the updated handling for spliced generations and duplicate message start events.

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