Built on AI SDK 6 + Vercel AI Gateway

The Agent Toolkit for TypeScript

A modular SDK for building AI agents in Next.js and React. Structured output, tool calling, reasoning, planning, and more.

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Modular by Design

Import only what you need. Each module is independent and optimized for tree-shaking.

Structured Output

Generate type-safe structured data with Zod validation

const result = await createStructuredOutput({
  model: 'openai/gpt-5',
  schema: z.object({
    sentiment: z.enum(['positive', 'negative']),
    confidence: z.number(),
  }),
  prompt: 'Analyze this text...',
})

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Streaming

Real-time streaming responses with React hooks

const stream = await createStreamingResponse({
  model: 'openai/gpt-5',
  messages,
  onToken: (token) => console.log(token),
})

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Tool Calling

Define and execute AI tools with middleware support

const toolkit = createToolkit({
  tools: [searchTool, calculatorTool],
  middleware: [loggingMiddleware],
})

const result = await toolkit.execute(toolCall)

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Conversation State

Manage conversation history with auto-summarization

const manager = new ConversationManager({
  maxMessages: 50,
  summarizeAfter: 20,
})

await manager.addMessage(id, { role: 'user', content })

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Step Reasoning

Chain-of-thought and tree-of-thought reasoning

const reasoner = createReasoningAgent({
  model: 'openai/o1-mini',
  reasoningStyle: 'chain-of-thought',
  maxSteps: 10,
})

const { steps, conclusion } = await reasoner.reason({
  problem: 'Analyze this fraud case...',
})

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Multi-Step Planning

Break complex goals into executable steps

const planner = createPlanningAgent({
  model: 'openai/gpt-5',
  tools: toolkit,
  allowReplanning: true,
})

const plan = await planner.plan({
  goal: 'Generate competitor analysis report',
})

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3 kits

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Evaluation & Testing

4 kits

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Multi-Provider Support

Built on Vercel AI Gateway, agent-tools-kit supports all major AI providers with a unified API. Switch between OpenAI, Anthropic, Google, and more by changing a single line of code.

OpenAI GPT-5, GPT-4o, o1 models

Anthropic Claude 4.6, Claude Opus

Google Gemini 3, Vertex AI

AWS Bedrock, Fireworks AI

// Switch providers with one line
import { createStructuredOutput } from 'agent-tools-kit/structured'

// Use OpenAI
const result1 = await createStructuredOutput({
  model: 'openai/gpt-5',
  schema: mySchema,
  prompt: 'Analyze...',
})

// Or switch to Anthropic
const result2 = await createStructuredOutput({
  model: 'anthropic/claude-opus-4.6',
  schema: mySchema,
  prompt: 'Analyze...',
})

Start Building Today

Try the interactive playground or dive into the documentation to start building your AI agent.

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