UCP Playground/Shared Session
Try it yourself
Storecasper.com
ModelGemini 3.6 Flash
OutcomeCart Created
DateSep 20, 2026, 10:44 PM
Tokens152,749 (150,254p / 2,495c)
Duration24.8s
Turns8
StepsSearch ProductsView DetailsAdd to CartCheckout URL
Connected withSnapshot at session start
Negotiationv2026-08-25 · 7/8 active · shopping
  1. DiscoverRead /.well-known/ucp (declares 2026-08-25)
  2. Select versionMerchant and platform both run 2026-08-25
  3. Intersect8 declared · 7 shared spec · 1 vendor · 0 excluded
  4. Resolve extensionsActive extension blocks: shopping.fulfillment, shopping.discount
  5. ActivateAgent runs the shopping prompt with 9 negotiated capabilities
7 shared · 1 vendor · 0 excludedprompt: shopping
  • 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.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 pillow for a side sleeper. Pick the best match yourself without asking me, add one to the cart, then read back the item name and the cart total. Do not check out.
Reasoning
**Searching for side sleeper pillow** I'm currently focused on identifying the optimal pillow for side sleepers. My next step involves a targeted search using keywords like "side sleeper pillow" to quickly locate suitable options.
create_cart616ms
Reasoning
**Exploring Pillow Options** My focus has shifted to evaluating the search results for pillows. The "Original Pillow" stands out with its specific mention of neck pain relief and unique fiber technology, available in Standard and King sizes. I'm now considering how this aligns with broader customer needs.
get_product242ms
create_cart624ms
Reasoning
**Considering Tool Call Limit** I'm reviewing the constraint regarding consecutive tool calls. We've just made two, so I need to either make another tool call or provide a text update. **Responding to Tool Limits** I've just made two consecutive tool calls. To adhere to the constraint, I'll now provide a text response before considering any further tool actions.
I've selected the Hybrid Pillow (Standard) as the best match for a side sleeper, combining supportive foam and plush down-alternative fiber for optimal neck and head alignment.

Adding it to your cart now...
create_cart614ms
create_cart573ms
Reasoning
**Exploring Pillow Variants** I'm currently investigating alternative pillow options. It appears the `Hybrid Snow Pillow - Standard` is also unavailable. My next step is to examine the King-sized versions of both the `Original Pillow` and the `Hybrid Pillow` to see if those are in stock.
Checking available stock for other pillow options...