How To Create A Simple ReAct Agent With LangGraph And OpenAI

This article explains how to create a simple ReAct agent application using LangGraph. The app will feature an agent (LLM) that determines when to utilize external tools, such as fetching weather information, to fulfill user requests.

  
  
  Overview

The ReAct agent workflow follows a structured loop:

The agent first decides if a tool (e.g., weather API) is needed.
If action is required, it calls the tool and sends the output back to the agent.
If no action is needed, the agent directly responds to the user.

This tutorial utilizes a prebuilt ReAct agent, which simplifies the initial setup...