If your store still calls get_cart or update_cart on Shopify’s legacy Storefront MCP endpoint, stop assuming you have time. The August 31, 2026 deadline this changelog set has now passed, and — for the first time — a Shopify staff member has said in public what the changelog itself never spelled out: the tools are meant to go away, not just stop being maintained.

What Shopify’s own changelog still doesn’t say

Shopify’s developer changelog, re-checked today, is unchanged since it first posted on June 24, 2026. It still says only that get_cart and update_cart on https://{shop}.myshopify.com/api/mcp “will be maintained until August 31, 2026” and should migrate to Cart MCP’s create_cart / get_cart / update_cart / cancel_cart tools at https://{shop-domain}/api/ucp/mcp. Nowhere does it say what happens on September 1 — whether the old tools disappear, return errors, or just quietly stop getting bug fixes.

The forum thread that got an answer

That ambiguity became a direct question on Shopify’s own developer forum. A developer named Faruk asked on August 26 whether the deprecated tools would be “removed from tools/list and calls start failing on/after Aug 31,” or would “keep working as-is, but receive no fixes and can break without notice” — because his app caches MCP tool metadata rather than refetching it every session, so the distinction changes his migration timeline.

A Shopify staff member, flaired “Shopifolk” and marked as an admin and moderator on the forum, replied the next day:

“Hey @Faruk - the tool are intended to be removed. They may not go away right away, but it is our intent to remove them around the August 31st deprecation date. Hope this helps a bit, I understand it’s not ideal, so please let me know if I can help with anything else on our end here.”

That’s the clearest statement of intent Shopify has made on this deadline anywhere — clearer than the changelog, and only reachable by asking directly in a forum thread most merchants will never see.

The second gap is still exactly where it was

This log previously reported that search_shop_policies_and_faqs — the tool an agent calls to answer shipping, returns and warranty questions — has no UCP successor. Re-checking that same thread today: it still has no reply from Shopify. The original poster’s own follow-up — “only the cart tools were deprecated, not the endpoint… search_shop_policies_and_faqs is not mentioned anywhere in [the changelog]” — remains the thread’s accepted answer three weeks later, unconfirmed by anyone at Shopify. The Sunset header contradiction it flagged (the whole /api/mcp endpoint returns an RFC 8594 Sunset: Mon, 31 Aug 2026 header on every response, cart-related or not) is also still unresolved in writing.

What this means if you run an agent on a Shopify storefront

  • Treat “intended to be removed” as your real deadline, already passed. Shopify’s own words are “may not go away right away,” not “won’t go away” — don’t rely on grace-period behavior holding.
  • If your integration caches tool metadata the way Faruk’s does, that cache is now stale. Refetch tools/list from /api/ucp/mcp and confirm your cart calls use the UCP shape (the meta["ucp-agent.profile"] object, idempotency keys on cancel_cart, PUT-style full-state update_cart).
  • Don’t assume the FAQ tool is safe just because it wasn’t named. No Shopify reply has confirmed search_shop_policies_and_faqs survives past the same Sunset header every other /api/mcp response carries. Have a fallback — a well-linked policy page or a structured llms.txt — that doesn’t depend on this one tool.

FAQ

Did Shopify confirm its Storefront MCP cart tools are being removed?

Yes. A Shopify staff member replied on the company’s own developer forum on August 27, 2026 that the deprecated get_cart and update_cart tools on /api/mcp “are intended to be removed… around the August 31st deprecation date,” while noting they “may not go away right away.” This is more explicit than Shopify’s changelog, which only states the tools are “maintained until” that date without saying what happens afterward.

Does search_shop_policies_and_faqs still work after August 31?

Unconfirmed. A merchant asked Shopify directly in a forum thread on August 13 whether the policies/FAQ tool has a UCP successor or survives the /api/mcp endpoint’s Sunset header; as of this writing, three weeks later, Shopify has not replied to that thread.

What should I do if my app caches Shopify MCP tool metadata?

Refetch it now. Shopify’s staff reply confirms removal is intended at the deadline even though it may be gradual — an app that only refetches tools/list occasionally, rather than every session, is the case Shopify’s own forum reply was responding to, and it should not assume its cached tool list is still accurate.

Sources

A protocol deadline that a platform’s own staff has to clarify in a forum reply, three weeks after the fact, is exactly the kind of capability gap AgentReady’s scan is built to catch before it costs you an agent’s checkout.