Storefront MCP cart tools move to UCP Cart MCP by August 31
Shopify is replacing Storefront MCP get_cart and update_cart with UCP Cart MCP tools and will maintain the deprecated tools only through August 31, 2026.
Commerce briefing › Week of Aug 17, 2026
sumhound-briefing-2026-34 · Aug 17, 2026–Aug 23, 2026
What commerce operators should check this week.
A free, source-backed operating brief. This issue contains only reviewed changes with a concrete audience and action; empty sections are stated instead of filled with unverified news.
01 · High-impact changes
Changes worth opening
02 · Fees, payouts and refunds
Settlement-adjacent changes
No reviewed signal in this issue names a payout or report category.
03 · What to check this week
Concrete next actions
- ShopifyMove cart calls to the UCP endpoint, send complete cart state for update_cart, and add the required UCP profile and idempotency metadata.View reasoning →
04 · Upcoming deadlines
Changes with a clock
2026-08-31Storefront MCP cart tools move to UCP Cart MCP by August 3105 · Report format and operations
Fields and workflows changing
No reviewed report-schema change appears in this issue.
06 · Original sources
Verify at the source
Storefront MCP cart tools move to UCP Cart MCP by August 31shopify.dev ↗Get the free Sumhound commerce briefing
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