How to Design a Production-Grade Multi-Agent Communication System Using LangGraph Structured Message Bus, ACP Logging, and Persistent Shared State Architecture

Tutorial on building production-ready multi-agent communication systems using LangGraph's Structured Message Bus architecture. The guide implements specialized agents communicating through shared state via ACP-style message schemas rather than direct calls, enabling modularity, traceability, and enterprise-grade orchestration. Uses Pydantic for strict message validation and persistent state management.