Every screen's empty/loading/error states, responsive behavior, and interaction notes — the gaps developers fill by guessing are where 'that's not what I designed' is born.
Color, spacing, and type as named tokens consumed by both Figma and code — 'primary-600' travels losslessly; 'that blue' doesn't.
A walkthrough per feature (intent, priorities, flexible vs fixed), async questions answered in the file, and designers reviewing staging builds — the collaboration rhythm, not a file thrown over a wall.
Built-vs-designed review on real devices with the checklist (spacing, states, motion) — cheap while it's a PR comment, expensive when it's a customer complaint.
Skipping the discipline this article describes until an incident, audit, or stalled project forces it — every practice above is cheaper adopted early than retrofitted under pressure.
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