AI Sdk 6

Vercel AI SDK v6 Development Guide

Use this skill when developing AI-powered features using Vercel AI SDK v6 (ai package).

Quick Reference

Installation

bun add ai @ai-sdk/anthropic zod

Core Functions

v6 Note: generateObject/streamObject are deprecated. Use generateText/streamText with output: Output.object({ schema }) instead.

Structured Output (v6)

import { generateText, Output } from "ai";
import { z } from "zod";

const { output } = await generateText({
  model: anthropic("claude-sonnet-4-5-20250929"),
  output: Output.object({
    schema: z.object({
      sentiment: z.enum(["positive", "neutral", "negative"]),
      topics: z.array(z.string()),
    }),
  }),
  prompt: "Analyze this feedback...",
});

Output types: Output.object(), Output.array(), Output.choice(), Output.json()

Agent Class (v6 Key Feature)

import { ToolLoopAgent, tool, stepCountIs } from "ai";
import { anthropic } from "@ai-sdk/anthropic";
import { z } from "zod";

const myAgent = new ToolLoopAgent({
  model: anthropic("claude-sonnet-4-5-20250929"),
  instructions: "You are a helpful assistant.",
  tools: {
    getData: tool({
      description: "Fetch data from API",
      inputSchema: z.object({
        query: z.string(),
      }),
      execute: async ({ query }) => {
        return { result: "data" };
      },
    }),
  },
  stopWhen: stepCountIs(20),
});

// Usage
const { text } = await myAgent.generate({ prompt: "Hello" });
const stream = myAgent.stream({ prompt: "Hello" });

API Route with Agent

// app/api/chat/route.ts
import { createAgentUIStreamResponse } from "ai";
import { myAgent } from "@/agents/my-agent";

export async function POST(request: Request) {
  const { messages } = await request.json();

  return createAgentUIStreamResponse({
    agent: myAgent,
    uiMessages: messages,
  });
}

useChat Hook (Client)

"use client";
import { useChat } from "@ai-sdk/react";

export function Chat() {
  const { messages, sendMessage, status } = useChat();

  return (
    <div>
      {messages.map((msg) => (
        <div key={msg.id}>
          {msg.parts.map((part) =>
            part.type === "text" ? part.text : null
          )}
        </div>
      ))}
    </div>
  );
}

Reference Documentation

For detailed information, see:

• agents.md - ToolLoopAgent, loop control, workflows
• core-functions.md - generateText, streamText, Output patterns
• tools.md - Tool definition with Zod schemas
• ui-hooks.md - useChat, UIMessage, streaming
• middleware.md - Custom middleware patterns
• mcp.md - MCP server integration

Official Documentation

For the latest information, see AI SDK docs.