UCP Playground/Shared Session
Try it yourself
Storebrooklinen.com
ModelGemini 3.6 Flash
OutcomeCart Created
DateOct 7, 2026, 10:05 AM
Tokens78,616 (77,076p / 1,540c)
Duration16.1s
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 focused on locating a queen-sized white sheet set. My next step involves utilizing the `search_catalog` function to execute this query, prioritizing availability filters if the schema supports them.
create_cart750ms
Reasoning
**Analyzing Search Results** I'm currently examining the search results, specifically focusing on the "Luxe Sateen Core Sheet Set." I've identified its handle and ID, and I'm now looking at its variants, starting with the White, Queen-sized option and its associated variant ID. **Selecting Sheet Set** I've narrowed down the choices. The "Luxe Sateen Core Sheet Set" in White/Queen, with variant ID `gid://shopify/ProductVariant/43350202744922`, stands out as the primary selection due to its best-seller status within the Luxe line.
Reasoning
**Confirming Order Details** I'm currently reviewing the captured order information. The item identified is the "Luxe Sateen Core Sheet Set" in Queen size and White, with a quantity of one. The subtotal for this item is $209.00. I am also noting the provided continuation URL.
I have added the best matching sheet set to your cart:

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

You can view or continue your cart using this link:
https://brooklinen2.myshopify.com/cart/c/hWNHgulEgRtsysyDRQa6kCtH?key=NALUdW7objCsw77P3WeTvxsEWwSf-pxO_5l7IGCGjniA15rJT45ZO0Z7rcNTgNp4n_--BTFMjucmtMHmShnGL8LvWqq2FiXxS2pERIq4JBtvy_NVhL6NFPlHChrU1PGsXS8A-xGsNMsac5oat09zBw%3D%3D