Agents aren't a one-size-fits-all solution for workflows needing structured decision-making, teamwork, or autonomy. Different architectures suit different needs, with single-agent setups ideal for simple tasks, multi-agent architectures suitable for complex processes requiring validation and structured decision-making, hierarchical agents mirroring management structures, and hybrid-sequential architectures blending structure with flexibility. Observability is crucial for debugging and scaling agents, but even the smartest agents need guidance to deliver precise results. The best architecture depends on workflow needs, starting simple and scaling as needed.