Meta Cuts Agent Hallucinations With 1,300-Line 'Thin Orchestrator'

Meta disclosed an AI agent architecture it calls the "thin orchestrator pattern," a 1,300-line router that delegates 20-plus workflows to 14 specialized agents while performing zero domain reasoning itself¹. The approach replaced a single-agent system that achieved 70–80% success with manual prompt engineering but dropped to 10–20% without it. Under the new design, about two-thirds of changes land without significant human edits, and configuration prep for a new data column completes in under an hour, down from three to four days by hand.