Table of Contents What an Orchestrator Actually Is The Four Core Responsibilities How Orchestrators Communicate With Agents The Three Orchestration Architectures Information Flow: Top-Down, Bottom-Up, and Lateral What Breaks in Production and Why The Evolving Orchestrator: What 2025 Research Proved Human Oversight as an Orchestration Function Protocols: Where MCP and A2A Fit The Decision Framework for Architects 1. What an Orchestrator Actually Is An orchestrator is not an agent that does work. An orchestrator is the entity that governs how work moves between agents, when it moves, under what conditions, and what happens when something goes wrong in transit. Think of a conductor leading an orchestra. The conductor does not play an instrument. The conductor reads the full score, signals entrances and exits, manages tempo, and intervenes when something goes off. The musicians — your specialized agents — are skilled at their instrument. The conductor is skilled at making them sound like one coherent system.…