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phase-preview

Preview a signed-off design one release phase at a time — cut it down into a series of phase screens, each showing only what exists by that phase with the layout untouched, then put them on a scrubber you drag to watch the screen fill in release by release. Use when the user wants a Phase 1 / MVP version of an existing wireframe or mockup, phased or staged screens, a design sliced by release phase or story map, or wants to see what a screen looks like before later features land.

plugins/vstack/experimental/phase-preview/SKILL.md

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Last checked
Nov 6, 2026

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11
Repository last updated
Nov 6, 2026
License
MIT

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One design in, one screen per phase out. Each phase file shows everything available **by** that
phase and nothing that isn't, in exactly the positions the approved design already put them — so a
phase screen is the real build target for that release, not a redrawing of it. Nothing here is
drawn: this is the approved design with the later releases taken out, which is why it can be
checked mechanically rather than by eye.

```
base.html ──┬──► phase-1/base.html    only what ships in phase 1
            ├──► phase-2/base.html    phase 1 + phase 2
            └──► phase-3/base.html    phase 1 + 2 + 3   ( = the base, if phases cover it all )
```

**Subtract only.** Nothing is moved, resized, restyled or repositioned; nothing new is invented. That
is the entire discipline of this skill, and §4 proves it mechanically rather than trusting the eye.