Reasoning-Placement Decision

Description

One of six recurring design decisions identified by the 'Build Your Own Agent' guide. Where does decision-making live: in the model (minimal scaffolding, e.g. Claude Code's 1.6% AI logic), in explicit state graphs (LangGraph), or in heavy planners (Devin)? As frontier models converge, the operational harness becomes the differentiator, not the planner.

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