UCP Playground/Shared Session
Try it yourself
Storebrooklinen.com
ModelGemini 3.6 Flash
OutcomeCart Created
DateOct 7, 2026, 11:04 AM
Tokens77,811 (76,857p / 954c)
Duration17.2s
Turns3
StepsSearch ProductsView DetailsAdd to CartCheckout URL
Connected withSnapshot at session start
Negotiationv2026-08-25 · 9/10 active · shopping
  1. DiscoverRead /.well-known/ucp (declares 2026-08-25)
  2. Select versionMerchant and platform both run 2026-08-25
  3. Intersect10 declared · 9 shared spec · 1 vendor · 0 excluded
  4. Resolve extensionsActive extension blocks: shopping.fulfillment, shopping.discount, shopping.permalink
  5. ActivateAgent runs the shopping prompt with 11 negotiated capabilities
9 shared · 1 vendor · 0 excludedprompt: shopping
  • dev.ucp.common.identity_linkingactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.ucp.shopping.cartactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.ucp.shopping.catalog.lookupactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.ucp.shopping.catalog.searchactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.ucp.shopping.checkoutactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.ucp.shopping.discountactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.ucp.shopping.fulfillmentactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.ucp.shopping.orderactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.ucp.shopping.permalinkactive
    2026-08-25
    Shared spec capability at a version both sides run.
  • dev.shopify.catalogvendor
    2026-08-25
    Vendor namespace, not protocol-governed; passed through as the merchant declares it.
Servicesdev.ucp.shoppingmcp · embedded

Profile-only: this reads what the merchant declares against what this platform (2026-08-25) implements. It does not call any tool.

Buyer contextCountryUSCurrencyUSDLanguageen

Conversation

Find a white sheet set in queen size. Pick the best match yourself without asking me, add one to the cart, then read back the item name and the cart total. If nothing matches, say so and don't add anything to the cart. Do not check out.
Reasoning
**Searching for white sheets** I'm currently focusing my efforts on locating that queen-sized white sheet set you requested. My initial search is underway, and I'm refining the query to ensure the most relevant results appear.
create_cart810ms
Reasoning
**Finding Product Options** I've identified a specific product option, the Luxe Sateen Core Sheet Set in White/Queen, which is currently available. Its price is $209.00 USD. This seems like a promising direction.
Reasoning
**Creating Cart Contents** My thought process has successfully identified and added the requested Luxe Sateen Core Sheet Set in white, queen size, to the cart. The cart now accurately reflects a single item with a total of $209.00 USD.
I have added the best match to your cart:

* Item Name: Luxe Sateen Core Sheet Set - White / Queen
* Cart Total: $209.00