I have reproduced the issue on the latest CLI version. Yes, I am on the latest version I have searched existing posts and this report is not a duplicate. Yes, this isn’t a duplicate In which of these areas are you experiencing a problem? Theme Expected behavior Cart Items should be added/updated/…

CLI > Theme Dev > cart ajax 401

Gray-Shopify January 27, 2026, 5:31pm 3

This might be the same as these two threads:

Topic		Replies	Views
Limit AJAX Cart API Online Store and Theme Development ajax-api , cli-themes	3	71	December 9, 2025
429 Too many requests Shopify CLI and Libraries theme-commands , app-dev-on-localhost	20	312	March 13, 2026
Connecting cursor to shopify Shopify CLI and Libraries app-dev-on-localhost	1	31	February 26, 2026
Aggressive bot detection with 429 errors AJAX Cart API Online Store and Theme Development ajax-api	50	1034	March 10, 2026
Shopify Theme Dev - 502 Error - Failed to perform theme synchronization Shopify CLI and Libraries theme-commands	16	378	December 5, 2025