live challenge

Full Stack Ecommerce Checkout Web App

Build a full-stack ecommerce checkout web app with cart items, quantities, promo codes, subtotal, shipping, tax, and order confirmation.

intermediate12 minute targetLive execution

Write your spec

Agnes AI builds exactly what you write, the sandbox serves it, and Playwright runs hidden tests against the real app.

Leaderboard
Live arena
Your spec · Full Stack Ecommerce Checkout Web App

Submits to the live execution path: Agnes AI builds the checkout artifact, the sandbox serves the preview, TokenRouter drafts cache-friendly evaluator checks, and Playwright scores the generated app as-is. Seeded scorecards remain reference runs.

Public requirements

  • 01Display cart items with name, price, and quantity.
  • 02Allow quantity changes.
  • 03Show subtotal, shipping, tax, discount, and total.
  • 04Accept promo codes.
  • 05Provide a checkout/confirm order button and success state.

Hidden tests

Illustration of hidden evaluator checks surrounding a generated checkout interface

The visible checkout is the easy part. Hidden tests reveal whether your spec encodes cents math, stock rules, async safety, and mobile checkout behavior.

Integer cents mathPromo normalizationInvalid code errorDiscount floorShipping threshold orderOut-of-stock blockDouble-submit preventionQuantity boundariesLoading and error statesMobile usability and accessibility

Good specs name these explicitly. Vague ones don't.