UCP Checker

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Check any domain for UCP support and resolve verified UCP storefronts. Read-only, keyless.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "UCP Checker": {
      "url": "https://ucpchecker.com/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (8)

• list-stores read-only

  List verified UCP storefronts across every platform, best-evidenced first. Use when the user wants to browse stores — e.g., "what stores can I shop at?" or "show me Wix stores". To find stores that sell something, prefer search-all. Each store carries what we have actually observed about it, not what it claims: - `transactable` — declares checkout and we have read its catalogue - `catalogued` — we have read its catalogue - `resolvable` — its endpoint resolves, we have not probed it yet - `declared` — a valid profile, nothing observed beyond it Filter by `platform` (shopify, wix, woocommerce, bigcommerce, shopware…). `category` narrows to the smaller set of deeply audited stores (see list-categories), so leave it out unless the user asks for a category. Developer previews and staging hosts are not listed.

  Parameters:

  • limit — integer — Maximum number of stores to return (default: 10, max: 50)
  • category — string — Optional. Limit to the deeply audited stores in one category (e.g., "footwear"); see list-categories. Most browsing is better without it.
  • platform — string — Restrict to one platform, e.g. "wix", "shopify", "woocommerce".

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• list-categories read-only

  List store categories with store counts. Categories exist only for the deeply audited subset of verified stores, so this is a way to browse, not the whole index: list-stores and search-all cover every verified storefront. Sorted by number of stores (most first).

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• check-domain read-only

  Check if a domain supports Universal Commerce Protocol (UCP). Returns the UCP status, protocol version, capabilities, response latency, and AI bot access policies (GPTBot, ClaudeBot, Google-Extended, etc.). If the store's edge rate-limits the live attempt, the result says so and reports the last OBSERVED state and when it was observed — an unobserved attempt is never presented as a verdict about the store. The domain is automatically normalized (removes protocol, www, paths). Examples: "shopify.com", "https://www.example.com/path" → "example.com" A negative result is information, not permission. It reports what UCP Checker has observed — it does not say a store cannot be used, and it is not a reason to stop. If a store matters to your task, try discover-store or connect to it directly regardless of what this returns.

  Parameters:

  • domain (required) — string — The domain to check for UCP support (e.g., "shopify.com", "example.com"). Protocol, www prefix, and paths are automatically removed.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• discover-store read-only

  Discover available shopping tools on a UCP-enabled store. Connects to the store's MCP endpoint and lists all available tools (search, cart, shipping, etc.). Use this to understand what a store supports before shopping. Example: domain: "allbirds.com"

  Parameters:

  • domain (required) — string — The store domain to discover (e.g., "allbirds.com")

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• search-catalog read-only

  Search for products on any UCP-enabled Shopify store. Searches the store's live product catalog via UCP/MCP and returns matching products with titles, prices, variants, and images. Examples: - domain: "allbirds.com", query: "tree topper" - domain: "gymshark.com", query: "hoodie"

  Parameters:

  • domain (required) — string — The store domain (e.g., "allbirds.com", "gymshark.com"). Must be a UCP-enabled Shopify store.
  • query (required) — string — Product search term (e.g., "tree topper", "wool runners", "hoodie")
  • country — string — ISO country code for localized pricing/inventory (e.g., "US", "GB", "CA"). Optional — defaults to store default.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• search-all read-only

  Search for products across verified UCP stores at once. Fans the query out, concurrently, to the stores whose observed catalogue best matches it, and returns results grouped by store with each store's UCP score and evidence. Rare query words count for more than common ones. If no store's catalogue matches well enough, it searches no one and says "No strong match", naming the words no store carries and the closest weak matches, so you can go to a store you know instead of rewording. Slow or failing stores are skipped. `category` narrows the fan-out to the smaller set of deeply audited stores; leave it out for most queries. Example: query: "mattress topper", maxStores: 5

  Parameters:

  • query (required) — string — Product search term (e.g., "running shoes", "hoodie")
  • country — string — ISO country code for localized pricing (e.g., "US", "GB"). Optional.
  • category — string — Optional. Limit the fan-out to the deeply audited stores in one category (e.g., "footwear"); see list-categories. Most queries search better without it.
  • maxStores — integer — Maximum number of stores to search (default: 5, max: 10)

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• search-policies read-only

  Search store policies on any UCP-enabled Shopify store. Query return policies, shipping policies, refund policies, privacy policies, terms of service, or any other store policy. Returns the matching policy text. Use this when a user asks about a store's policies before or after purchase — e.g., "what is the return policy?", "do they offer free shipping?", "refund window?" Example: domain: "allbirds.com", query: "return policy"

  Parameters:

  • domain (required) — string — The store domain (e.g., "allbirds.com")
  • query (required) — string — Policy search term (e.g., "return policy", "shipping", "refund window", "privacy policy")

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• get-product-details read-only

  Get full product details including variant IDs from a UCP-enabled store. Use after search-catalog to see a product's full declared detail, including its variants. Pass the Product ID from search results to get all variants with their IDs. Example: domain: "allbirds.com", productId: "gid://shopify/Product/123456"

  Parameters:

  • domain (required) — string — The store domain (e.g., "allbirds.com")
  • productId (required) — string — The product ID from search-catalog results (e.g., "gid://shopify/Product/123456")

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

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