ST-2026-110 · Removals & lifecycle enforcement
Shopify deprecates Storefront MCP cart tools in favour of UCP Cart MCP
Shopify deprecated the Storefront MCP server's get_cart and update_cart tools on 24 June 2026 and directs cart integrations to the UCP-conforming Cart MCP endpoint, with maintenance of the deprecated tools stated only through 31 August 2026.
Previous state
Storefront MCP cart integrations called get_cart and update_cart at https://{shop}.myshopify.com/api/mcp, and update behavior was tied to those earlier tool schemas.
Current state
The Storefront MCP get_cart and update_cart tools are deprecated. Shopify's UCP-conforming Cart MCP at https://{shop-domain}/api/ucp/mcp provides create_cart, get_cart, update_cart and cancel_cart, and update_cart replaces the cart's complete state.
Affected users
Who needs to care
Apps and agents calling Storefront MCP get_cart or update_cart at /api/mcp, particularly implementations that patch individual cart fields or do not send the metadata required by Cart MCP.
Required response
What to do
Move cart calls to /api/ucp/mcp; include meta.ucp-agent.profile on every request; send a UUID meta["idempotency-key"] for cancel_cart; send the complete line_items array on each update_cart call; and validate against the updated request and response schemas.
Evidence boundary
What the source does not prove
Shopify says the deprecated tools would be maintained until 31 August 2026, but the notice does not state that the old endpoint was removed or disabled after that date. The replacement claim is limited to the four named Cart MCP tools and their documented request semantics.
Lifecycle history
Dated event sequence
- Deprecation announced
Shopify deprecated Storefront MCP get_cart and update_cart and directed documentation and migrations to the UCP-conforming Cart MCP endpoint.
- Stated maintenance-through boundary
Shopify said the deprecated Storefront MCP cart tools would be maintained until this date without announcing a removal date.
Evidence ledger
First-party sources
- 01Shopify — Storefront MCP cart tools are being deprecated in favour of UCP Cart MCP
Official Shopify developer changelog · 2026-06-24
Open official source ↗