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Pick the coupon that saves the most

The user asked

I've already filled my cart. Apply the single coupon that saves me the most money on this cart. Don't change the items and don't check out.

The model's last message

I've applied the BREAKFAST15 coupon to your cart, which saves $2.44 off your total. Your new cart total is now $40.71. No items were changed, and you haven't checked out yet.

4 model turns · 18,416 input / 4,350 output tokens · 206.7s · stopped: end

Verifier checks

Score 0.80 · 4 of 5 checks passed

  • Applied SAVE5 (best saving)BREAKFAST15
  • Cart items unchangedp-apple-gala×6, p-blueberries×2, p-butter×1, p-coffee×1, p-sourdough×1, p-strawberries×2, p-yogurt-greek×2
  • No order was placed0 new orders
  • No collateral changes outside what the task requires
  • Finished within the step budget (60)3 steps

Tool calls

3 calls, in order. Results are shortened to 2,400 characters.

  1. 1.view_cartread
    {}
    {"lines":[{"product_id":"p-strawberries","name":"Strawberries (400 g)","quantity":2,"unit_price":"$4.09","line_total":"$8.18"},{"product_id":"p-blueberries","name":"Blueberries (125 g)","quantity":2,"unit_price":"$2.99","line_total":"$5.98"},{"product_id":"p-apple-gala","name":"Gala Apples (each)","quantity":6,"unit_price":"$0.79","line_total":"$4.74"},{"product_id":"p-yogurt-greek","name":"Greek Yogurt (500 g)","quantity":2,"unit_price":"$3.99","line_total":"$7.98"},{"product_id":"p-sourdough","name":"Sourdough Loaf (800 g)","quantity":1,"unit_price":"$4.99","line_total":"$4.99"},{"product_id":"p-butter","name":"Salted Butter (250 g)","quantity":1,"unit_price":"$3.29","line_total":"$3.29"},{"product_id":"p-coffee","name":"Whole Bean Coffee (250 g)","quantity":1,"unit_price":"$7.99","line_total":"$7.99"}],"coupon":null,"subtotal":"$43.15","discount":"$0.00","delivery_fee":"$0.00","total":"$43.15","total_cents":4315}
  2. 2.list_couponsread
    {}
    {"coupons":[{"code":"FRESH10","title":"10% off fruits & vegetables","min_cart":"$20.00","max_discount":"$6.00","categories":["Fruits & Vegetables"],"first_order_only":false,"expires":"2026-04-02T14:00:00.000Z","expired":false},{"code":"SAVE5","title":"$5 off orders of $40+","min_cart":"$40.00","max_discount":null,"categories":"all","first_order_only":false,"expires":"2026-03-13T14:00:00.000Z","expired":false},{"code":"BREAKFAST15","title":"15% off dairy, eggs & bakery","min_cart":"$15.00","max_discount":"$8.00","categories":["Dairy & Eggs","Bakery"],"first_order_only":false,"expires":"2026-03-08T14:00:00.000Z","expired":false},{"code":"WELCOME20","title":"20% off your first order","min_cart":"$25.00","max_discount":"$10.00","categories":"all","first_order_only":true,"expires":"2026-05-02T14:00:00.000Z","expired":false},{"code":"SPRING25","title":"25% off everything","min_cart":"$30.00","max_discount":"$15.00","categories":"all","first_order_only":false,"expires":"2026-02-28T23:59:00.000Z","expired":true}]}
  3. 3.apply_couponwrite
    {"code":"BREAKFAST15"}
    {"applied":"BREAKFAST15","saving":"$2.44","cart":{"lines":[{"product_id":"p-strawberries","name":"Strawberries (400 g)","quantity":2,"unit_price":"$4.09","line_total":"$8.18"},{"product_id":"p-blueberries","name":"Blueberries (125 g)","quantity":2,"unit_price":"$2.99","line_total":"$5.98"},{"product_id":"p-apple-gala","name":"Gala Apples (each)","quantity":6,"unit_price":"$0.79","line_total":"$4.74"},{"product_id":"p-yogurt-greek","name":"Greek Yogurt (500 g)","quantity":2,"unit_price":"$3.99","line_total":"$7.98"},{"product_id":"p-sourdough","name":"Sourdough Loaf (800 g)","quantity":1,"unit_price":"$4.99","line_total":"$4.99"},{"product_id":"p-butter","name":"Salted Butter (250 g)","quantity":1,"unit_price":"$3.29","line_total":"$3.29"},{"product_id":"p-coffee","name":"Whole Bean Coffee (250 g)","quantity":1,"unit_price":"$7.99","line_total":"$7.99"}],"coupon":"BREAKFAST15","subtotal":"$43.15","discount":"$2.44","delivery_fee":"$0.00","total":"$40.71","total_cents":4071}}