Documentation

Start building with Threadplane

Streaming agent interfaces with runtime adapters, a shared Agent contract, and a drop-in chat surface. Most packages are MIT; @threadplane/chat is dual-licensed for noncommercial/evaluation and commercial production use.

Pick your backend

LangGraph

LangChain

For LangChain & LangGraph backends.

npm i @threadplane/chat @threadplane/langgraph @langchain/core @langchain/langgraph-sdk marked

Adapter quickstart →

AG-UI

AG-UI · CopilotKit

For CrewAI, Mastra, Pydantic AI, Strands, and more.

npm i @threadplane/chat @threadplane/ag-ui @ag-ui/client @ag-ui/core marked

Adapter quickstart →

Not sure which to use? Choosing an adapter → Want the drop-in UI first? Chat quickstart →

Generative UI

A2UI

Google

Agent-to-UI protocol — the agent streams and updates surfaces over the conversation.

Get started →

json-render

Vercel

Render a fixed JSON spec into your own Angular components. You own the schema.

Get started →

Which fits my use case? json-render vs A2UI →

Chat UI

Chat

Threadplane

Drop-in chat components — message list, input, streaming, tool calls, interrupts, subagents. Renders A2UI & json-render surfaces inline.

Supporting libraries

Middleware

JS & Python client-tool routing

Licensing

Token verification

Telemetry

Browser & Node events

Looking for something specific?

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