Agent Orchestrators vs. Coordinators: Why the Distinction Matters in Multi-Agent AI

A developer behind the tool Foremerge has outlined a key architectural distinction between agent orchestrators and agent coordinators, two terms often used interchangeably in AI development. Orchestrators sit directly in the control path, managing session spawning, task queuing, and process lifecycles — meaning the entire fleet halts if one goes down. Coordinators, by contrast, operate beside the control path, receiving declarative intent from agents before code changes are made and checking for conflicts without controlling execution. Foremerge, for example, detects clashes such as one agent replacing a symbol while another extends it, flagging the issue before any code is written. The author argues that as multi-agent workflows scale beyond two or three concurrent agents, recognizing this layered separation becomes critical for building reliable systems.