ReAct Agent Pattern Explained with Examples: A Complete Guide for AI Agents The ReAct Agent Pattern is one of the most important concepts in modern AI agent development. As businesses increasingly adopt AI automation, autonomous agents, and Large Language Models (LLMs) , understanding how an AI agent thinks, acts, and responds becomes essential. ReAct provides a simple but powerful approach: an AI agent combines Reasoning + Acting to solve problems step by step. In this guide, you will learn what the ReAct agent pattern is, how it works, its architecture, practical examples, benefits, limitations, and how developers use it to build intelligent AI agents. What Is the ReAct Agent Pattern? ReAct stands for: Re = Reasoning Act = Acting The ReAct agent pattern allows an AI model to alternate between: Understanding a problem Reasoning about what information is needed Taking an action or using a tool Observing the result Repeating the process until t...
Complete step-by-step guide · 2026 The 2026 stack is not Custom GPTs, Swarm, or Agent Builder. Those are deprecated or shutting down. Production work now sits on three paths: Workspace Agents, the OpenAI Agents SDK, and native GPT-5.6 Multi-agent. Updated September 2026. OpenAI’s rule: start with one agent. Split into a team only when a single prompt and tool list starts failing. Path Who it is for What to use No-code / team workflows Ops, support, PMs Workspace Agents in ChatGPT Code / products Engineers OpenAI Agents SDK (Python or JS) Native parallel subagents Research, reviews, exploration Responses API Multi-agent (gpt-5.6, beta) Contents What changed in 2026 Do you need multiple agents? Pick a pattern Path A: Workspace Agents Path B: Agents SDK Path C: GPT-5.6 Multi-agent TypeScript A system you can ship Mistakes that kill systems Framework choice Build order Official starting points 1. What actually changed in 2026 Swarm is dea...