Asking a single AI to design your system is a mistake. Single prompts yield generic, happy-path answers. Instead, developers should build multi-agent workflows where specialized AIs—like an Architect, Red-Team, and Evaluator, actively debate the architecture. By forcing LLMs to propose, critique, and score tradeoffs against simpler baselines, you avoid brittle chatbot responses. The result is an automated architecture review board that outputs production-ready Decision Records.