Key takeaways
- Handoff includes states, empty views, and edge cases - not just happy paths
- Tokens and spacing beat one-off magic numbers
- Unresolved product questions shouldn’t hide in design comments
Engineers don’t stall because they dislike design. They stall when the file shows one happy path, three conflicting comments, and no answer for loading, error, or empty states. That’s not collaboration - it’s ambiguity with gradients.
What a shippable handoff includes
- Happy path plus loading, empty, error, and permission-denied states
- Responsive behavior called out for key breakpoints
- Interaction notes: hover, focus, disabled, pressed
- Content rules: truncation, max lengths, pluralization
- Accessibility: tap targets, contrast intent, focus order notes
“If it isn’t specified, it will be improvised - and then redesigned in QA.”
Tokens over archaeology
Name colors, type styles, and spacing in a shared language. When every screen invents `17px` and `#3DFFA8` at 83% opacity, implementation drifts and dark mode becomes a rewrite.
- 01
Align on the system
Shared tokens for color, type, space, radius - even a small set beats none.
- 02
Annotate exceptions
If a screen breaks the system on purpose, say why in one line.
- 03
Resolve product questions first
Open decisions belong in a ticket, not buried in a sticky note engineers miss.
5
Core states to specify per critical screen
1
Source of truth file (not five forks)
30m
Walkthrough that saves days of rework
Close the loop
After implementation, compare build to handoff with the same checklist. Drift becomes system updates - not silent one-offs. That’s how design systems stay real instead of decorative.
