Vibe Coding
Pattern: The 'Mark the Boundary' Discipline — Vibe-Code the Prototype, Agentically Engineer the Product
The maturing 2026 consensus (echoed by Simon Willison and multiple SDLC guides) is to consciously separate the two modes: vibe coding optimizes for speed and accepts unread code; agentic engineering optimizes for correctness with specs, tests, and review — and you should annotate in the codebase where one ends and the other begins. The actionable move is a literal marker (folder, comment, or branch convention) distinguishing throwaway-prototype regions from engineered regions so later agents apply the right rigor. Prevents prototype-grade code from silently becoming load-bearing.
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