A step-by-step tutorial for building a multi-agent telecom customer support system using CopilotKit and LangGraph. The system features four specialized agents: an Intent Agent (classifies queries), a Customer Lookup Agent (retrieves profiles), an Escalation Agent (decides if human handoff is needed), and a Reply Agent (generates personalized responses). The frontend is built with Next.js and uses CopilotKit's AG-UI protocol, useAgent, and useFrontendTool hooks to synchronize state bidirectionally between the UI and backend agents. The LangGraph backend defines a sequential workflow (Intent → Lookup → Escalation → Reply) with shared state flowing through all nodes. Key patterns include centralized React Context for state management, frontend tools that agents can call to modify UI in real-time, and Command.interrupt for human-in-the-loop escalation flows.