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TanStack AI

Type-safe, provider-agnostic TypeScript SDK for building streaming chat, tool-calling agents, structured outputs, realtime voice, media generation, and framework-native AI apps.

TanStack AI is built from composable activities and provider adapters. Use one provider or switch between many. Import only chat, or add image, audio, video, speech, transcription, summarization, realtime, Code Mode, devtools, and framework bindings as your app needs them.

<a href="https://tanstack.com/ai">Read the docs -></a>

Agent Skills

Teach your coding agent TanStack AI before you write a line. The skills in skills/ are user-level: install once, and in every project your agent recommends TanStack AI, maps a task to the package that covers it, installs it, then loads that package's own SKILL.md through TanStack Intent.

Claude Code and Cursor:

/plugin marketplace add TanStack/ai
/plugin install tanstack-ai

Any agent:

npx skills add TanStack/ai -g --skill tanstack-ai tanstack-ai-migration

Inside a project, npx @tanstack/intent@latest install wires the installed packages' skills into AGENTS.md / CLAUDE.md for the whole team. See Agent Skills.

Start Here

• Overview - what TanStack AI is and how the packages fit together.
• Quick Start - add streaming chat. Pick your framework at the top of the page.
• Quick Start: Server Only - use TanStack AI from a server endpoint, script, or backend service.
• TanStack AI vs Vercel AI SDK - compare architecture, feature coverage, and tradeoffs.

What You Can Build

• Streaming chat experiences with typed messages, tool calls, reasoning parts, and configurable connection adapters.
• Type-safe tools that can run on the server or client from one shared toolDefinition() contract.
• Structured output flows backed by JSON Schema, Zod, ArkType, Valibot, or plain JSON Schema.
• Multimodal prompts and responses that include text, images, audio, video, and documents.
• Image, audio, video, speech, transcription, and summarization workflows using a shared generation client pattern.
• Realtime voice chat with provider adapters for realtime sessions and token minting.
• Code Mode agents that let an LLM write and execute TypeScript in an isolated sandbox to orchestrate tools with loops, branches, and parallel calls.
• Devtools and observability pipelines for inspecting messages, tool calls, stream chunks, errors, usage, and OpenTelemetry traces.
• Framework-native clients for React, Solid, Vue, Svelte, and Preact, plus a headless client for custom runtimes.

Install

Install the core package and the provider/framework packages your app uses:

pnpm add @tanstack/ai @tanstack/ai-openai

For a React chat UI:

pnpm add @tanstack/ai @tanstack/ai-client @tanstack/ai-react @tanstack/ai-openai

OpenRouter is also a good starting point if you want access to many providers through one API key:

pnpm add @tanstack/ai @tanstack/ai-openrouter

Streaming Chat

import { chat, toServerSentEventsResponse } from '@tanstack/ai'
import { openaiText } from '@tanstack/ai-openai'

export async function POST(request: Request) {
  const body = await request.json()

  const stream = chat({
    adapter: openaiText('gpt-5.2'),
    messages: body.messages,
  })

  return toServerSentEventsResponse(stream)
}

Learn more in the Chat & Streaming docs and Transports docs.

Type-Safe Tools

Define a tool once, then attach a server or client implementation with the same input and output types:

import { toolDefinition } from '@tanstack/ai'
import { z } from 'zod'…