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ai

TypeScript SDK for streaming chat, tool-calling agents and structured output across model providers and UI frameworks.

Harness by TanStack

IndexedMIT★ 3,242
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npm install @tanstack/ai

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About

TanStack AI is a TypeScript SDK built from composable activities and provider adapters. It covers streaming chat, tools that can run on the server or the client from a shared definition, and structured output validated with JSON Schema, Zod, ArkType or Valibot. It also includes image, audio, video, speech and transcription workflows, realtime voice, and framework clients for React, Vue, Svelte, Solid and Preact. OpenTelemetry traces and devtools are included for inspecting messages and tool calls.

Use cases: agent-orchestration, frontend-development

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Fact sheet

Languages
TypeScriptREADME
Packages
@tanstack/ai (npm), @tanstack/ai-openai (npm), @tanstack/ai-client (npm), @tanstack/ai-react (npm)README
Streaming
YesREADME
Observability
OpenTelemetryREADME
Model providers
openai, anthropic, google, openrouterREADME
Maturity
Stablegithub.com

Facts extracted by Claude Haiku 5.5 from the linked sources on Oct 24, 2026. Wrong fact? Tell us.

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    Featured in

    Signals

    Stars
    3,242
    Forks
    371
    Open issues
    23
    Last commit
    Oct 24, 2026 (6 days ago)
    Last release
    Oct 22, 2026 (8 days ago)

    From GitHub (fetched Oct 24, 2026).

    Details

    Packages
    npm @tanstack/ainpm @tanstack/ai-openainpm @tanstack/ai-clientnpm @tanstack/ai-react
    License
    MIT
    Repository
    github.com/TanStack/ai
    Website
    tanstack.com/ai/latest
    First seen
    Oct 24, 2026
    Last checked
    Oct 24, 2026
    Source
    READMEgithub-graphql

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    Cite this page

    ai. Agent Mart. https://agentmart.dev/harnesses/ai (last updated 2026-10-24)