A developer on Reddit recently told me: " Companies right now are risking the LLM-led parts of their architecture due to FOMO. We'll see how far they get ". He is absolutely right. Fear Of Missing Out is driving engineering teams to ship "Autonomous Agents" at breakneck speed. But in the rush to production, we are abandoning 20 years of established software engineering principles. We are letting probabilistic models control deterministic runtimes. If you are routing network traffic, validating data schemas, or checking user permissions using an LLM prompt, you are not building a resilient system. You are building a fragile prompt-chain wrapped in hope. When it fails (and it will), it will be slow, expensive, and completely un-auditable. InfoSec won't accept "the model hallucinated the auth check" as a valid incident report. The Cure: The Manager-Executor Pattern To build enterprise-grade Multi-Agent Systems, we must separate the Cognitive from the Deterministic . 1.…