Most teams land on the same pattern. Customize at the edges, standardize the core. Early customization feels productive, but every custom prompt, integration, and business rule becomes a maintenance liability once models update and docs change. Keep retrieval, routing, guardrails, and handoff stable. Reserve customization for real differentiation. The real question is not custom versus simple. It is which customizations earn their upkeep. Anything tied to fast moving models rots fastest. Most teams simplify over time, not expand.