2 people reported
All time, since Jul 21, 2025.
update_cart returns empty cart lines
“When I send a request to the Shopify Storefront MCP endpoint, the cart does not get updated.”
Is this your bug? What gets counted gets fixed. Pile on.
Paste this into your agent. It files your report, with your error and version.
I hit this bug: rapsheet.dev/sheets/shopify/issues/10595/file Follow it to file my report. Show me the text before you send.
No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends
Storefront MCP update_cart returns cart with empty lines. Calling update_cart with lines and merchandise_id returns 200 and a cart with total_quantity 0, so the checkout URL doesn't work.
Is this your bug?
File my report- Where
- Storefront MCP server
- How bad
- Breaks a normal workflow.