Extending the Vercel AI SDK to Support Anthropic Advanced Tool Use

The Ituri team is excited about the new Advanced Tool Use capabilities Anthropic has introduced for Claude models. These features expand how models work with tools, including multi-step interactions, programmatic tool calling, and more flexible tool behavior.

We wanted to experiment with these features while continuing to use the Vercel AI SDK. Since the SDK does not yet support Advanced Tool Use, we created a small fork that adds the minimal changes needed.

---

What this fork does:

• Exposes Advanced Tool Use fields and message patterns
• Works with existing AI SDK applications
• No new abstractions or frameworks

---

If you are exploring Anthropic's new capabilities and want to stay within the Vercel AI SDK ecosystem, feel free to use or reference the fork until official support for these capabilities becomes available.