# Introduction
URL: /docs/runtimes/langgraph/tutorial/introduction

Build a stockbroker assistant with LangGraph and assistant-ui.

In this tutorial, we will build a stockbroker assistant using LangChain.js, LangGraph.js and assistant-ui.

We will go through the necessary steps to integrate assistant-ui with a LangGraph Cloud endpoint.
Code snippets focus on the setup of the frontend, but we will highlight relevant sections of the backend code as well.

This agent leverages the following features:

* 🚄 Streaming of messages from LangGraph state to assistant-ui
* 💅 Rich text rendering using Markdown
* 🛠️ Generative UI: Mapping tool calls to tool UIs
* 🔁 Approval UI: Confirming tool calls before execution (human-in-the-loop)

Prerequisites \[#prerequisites]

* Node.js 18.x or higher

Final Result \[#final-result]

* Demo: [https://assistant-ui-stockbroker.vercel.app/](https://assistant-ui-stockbroker.vercel.app/)
* Source Code: [https://github.com/assistant-ui/assistant-ui-stockbroker](https://github.com/assistant-ui/assistant-ui-stockbroker)

Get Started \[#get-started]

Begin Part 1 of the tutorial by [setting up the frontend](/docs/runtimes/langgraph/tutorial/part-1).
