ucp.new
Explore Universal Commerce Protocol (UCP) with live Shopify catalog search, Cart MCP, Checkout MCP, product lookup, and raw JSON-RPC inspection.
First seen 2026-09-07 · Last seen 2026-09-14 · Source: webmcp.com
Answer 4 · Act 3 · Transact 0 · Score: Not yet scored
Tool inspector
add_to_cart
Add an exact visible catalog variant to its merchant cart. First call get_search_results with product_id and copy the product_id and variant_id exactly; never guess a size, option, seller, or unavailable variant. This adds to an existing line when present and schedules merchant Cart MCP sync, but does not begin checkout.
Page: /
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
product_id |
string | yes | Exact product id from get_search_results in the active session. |
variant_id |
string | yes | Exact available variant id returned for that product by get_search_results with product_id. |
quantity |
integer | no | Number of units to add to this exact line; defaults to 1. |
Raw JSON schema
{
"type": "object",
"properties": {
"product_id": {
"type": "string",
"minLength": 1,
"maxLength": 2048,
"description": "Exact product id from get_search_results in the active session."
},
"variant_id": {
"type": "string",
"minLength": 1,
"maxLength": 2048,
"description": "Exact available variant id returned for that product by get_search_results with product_id."
},
"quantity": {
"type": "integer",
"minimum": 1,
"maximum": 999,
"default": 1,
"description": "Number of units to add to this exact line; defaults to 1."
}
},
"required": [
"product_id",
"variant_id"
],
"additionalProperties": false
}
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