MCP server · UNTUCKit

untuckit-storefront-ucp

UNTUCKit's Shopify storefront operates a live, first-party-hosted MCP endpoint as the transport for the Universal Commerce Protocol (UCP) shopping service. The endpoint, its OpenRPC schema, and the agent flow are published in the store's agents.md / llms.txt and advertised in the UCP merchant profile at /.well-known/ucp (saved at well-known/untuckit-ucp.json). A live POST tools/list probe on 2026-07-21 answered with a JSON-RPC UCP-discovery error requiring an agent profile URI, confirming the endpoint is live and gated on the UCP agent-profile handshake.

Open endpoint → UNTUCKit provider profile

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Provider: UNTUCKit Type: Hosted endpoint Transport: http Host: www.untuckit.com

Endpoint

https://www.untuckit.com/api/ucp/mcp

Hosted endpoint · transport http

Connect

This is a remote MCP server — point an MCP client at the endpoint URL. Clients with native remote support (Claude, Cursor, VS Code, …):

# mcp client config (e.g. .mcp.json / mcp settings) { "mcpServers": { "untuckit": { "url": "https://www.untuckit.com/api/ucp/mcp" } } }

For stdio-only clients (older Claude Desktop, etc.), bridge with mcp-remote:

# Add to claude_desktop_config.json { "mcpServers": { "untuckit": { "command": "npx", "args": ["-y", "mcp-remote", "https://www.untuckit.com/api/ucp/mcp"] } } }

If the server requires authentication, add the provider's token/header (e.g. an X-API-Key) per its docs. A quick reachability check:

curl -i -X POST https://www.untuckit.com/api/ucp/mcp \ -H "Content-Type: application/json" -H "Accept: application/json, text/event-stream" \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Tools

search_catalog — Search the store catalog for products matching the buyer's intent.
create_cart — Create a cart and add desired items.
create_checkout — Start the purchase flow for a cart.
update_checkout — Set shipping address and shipping method on a checkout.
complete_checkout — Finalize the purchase; the buyer must approve payment.

About MCP

The Model Context Protocol (MCP) is an open protocol Anthropic introduced for connecting LLM-based agents to external tools and data sources. Providers publish MCP servers that expose their API surface as structured, discoverable tools — an MCP-compatible client (Claude Desktop, Cursor, Cline, Continue, etc.) can connect to the server and call its tools without any per-provider integration code.

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