# Cart

> Design and build the cart surface and its state — the add-to-cart feedback moment (never a full page reload), the slide-over drawer vs dedicated /cart page decision, line-item anatomy with quantity steppers and remove-with-undo, an empty cart designed as a merchandising moment, honest server-computed running totals with a free-shipping progress bar, exactly ONE cross-sell slot under the anti-three-cards rule, and optimistic updates wired to server actions. Three named variants (slide-over drawer, dedicated page, mini-cart popover). Invoke in Phase 6/7 whenever a commerce build needs a cart — add-to-cart, mini-cart, cart drawer, /cart page, quantity steppers, free-shipping bar, or "nothing owns the cart" — or when the user says "add a cart", "mini cart", "cart drawer", "the cart reloads the page", "update the cart total", or "cross-sell in the cart".

## Facts
- Page: https://tashan.sh/capability/skill-blyatiful1-cart
- tashan id: skill:blyatiful1/cart
- Source: https://github.com/blyatiful1/ultraweb
- Type: skill
- Category: other
- tashan score: not scored (catalogued only — too little public evidence)
- Adoption: 9.0
- Upkeep: 99.0
- Freshness: 97.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- License: MIT
- Official: no

## Install

```sh
cp -r cart ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

---
Measured 2026-08-23 by tashan (https://tashan.sh) from public evidence. Scorer s5.