Building a Production-Ready Composable AI Agent System with CopilotKit and LangGraph

Introduction Building AI agents is one thing. Building agents that actually work together in a real application? That's where it gets tricky. Today, we're going to build a composable multi-agent system that combines three specialized agents - a Summarizer, a Q&A engine, and a Code Generator - into a single, coordinated workflow. We'll use Next.js for the frontend, LangGraph for agent orchestration, and CopilotKit to wire everything together with a beautiful, real-time UI. You'll find architecture, the key patterns, how state flows between agents, and the step-by-step guide to building this from scratch. Let's build it. Check out the full source code on GitHub and the CopilotKit GitHub ⭐️ What is CopilotKit? CopilotKit is an open-source framework that makes it easy for developers to add AI copilots right into web applications. It has tools for connecting LLMs (like the OpenAI models) to React or Next.js components so that users interact with AI directly in your application - through