Text

Output and tools

Apps

Build a TypeScript support desk with the Vercel AI SDK: generateText, streamText, Zod output, tools, approvals, ToolLoopAgent, chat routes and tests. No API key needed.

Vercel AI SDK

Vercel AI SDK overview

Install the Vercel AI SDK and set up API keys

Installation and setup

AI SDK generateText basics

generateText: a first model call

AI SDK providers and API keys

Providers, models and API keys

AI SDK MockLanguageModelV4 stand-in

MockLanguageModelV4: a readable stand-in

AI SDK messages and system prompts

Prompts, system instructions and messages

AI SDK streamText for streaming

Streaming with streamText

AI SDK structured output with Zod

Typed output with Output.object and Zod

AI SDK tool calling and multi-step

Tools and multi-step calls

AI SDK tool execution approval

Tool approval before a refund

AI SDK ToolLoopAgent agents

Agents with ToolLoopAgent

AI SDK agent loop control

Loop control: stopWhen and prepareStep

AI SDK language model middleware

Middleware: logging and default settings

AI SDK error handling and retries

Errors and retries

AI SDK useChat with a chat API route

A chat API route and useChat

Testing AI SDK code with mock models

Testing with node:test and mock models

AI SDK support desk with approvals

Support desk with approval and tests

Output and tools quiz

How does Output.object tell the model what to return?