Someone types "find me a waterproof jacket under $150 and order it" into an assistant in their browser. Until this week, the second half of that sentence was the hard part. On September 28, Shopify made it possible for buyers who check out with Shop Pay, and store owners didn't have to do anything.

What Shopify switched on

Shopify's changelog entry adds four checkout tools that an AI agent running in the buyer's browser can call: get_checkout, update_checkout, complete_checkout and navigate_to_storefront. The agent no longer has to click through your checkout pages the way a person would. It asks the checkout what state it's in and fills in what the buyer told it. There's nothing to set up, and the docs don't list a way to turn it off.

The limits are worth knowing. The tools only appear when the buyer pays with Shop Pay on Shopify's standard three-page checkout. Agents can't change which items are in the order or type in new card details. The checkout docs also tell the agent to show the buyer the order and total and get a yes before anything is placed. That's an obligation on the agent. We haven't seen anything saying the tool enforces it.

The first half of the trip arrived earlier. Since August, agents in the browser can search, open product pages and fill a cart on every Liquid theme through Shopify's storefront tools. Put the two together and the whole path, from "show me jackets" to a placed order, can now happen in one browser tab.

Not every retailer is going along. Amazon started blocking Meta's Muse shopping agent on September 20 and told users that an unauthorized agent breaks its Conditions of Use (TechSpot). Shopify went the other direction. It's also early: nobody has confirmed which agents are calling the checkout tools yet, and there are no usage numbers.

Where your product images come in

An agent doesn't look at your photos the way a shopper does. Shopify's storefront catalog docs show each product handed over as structured data: title, description, options, price, and a list of media where each image can carry its own alt_text field. If you wrote alt text in your Shopify admin, that's what belongs in the field. If you left it blank, the agent gets nothing to read, and depending on the call the field may not be there at all.

Whether a given agent reads that field is up to the agent. We ran into a case where one image came back with alt text in one part of a catalog response and none at all in another. Shopify's help pages on what it shares with AI channels list title, description, options, images, price and availability, and don't name alt text. That doesn't prove it's left out, but it's a reason not to assume it's there.

What nobody has tested

Here's the part we can't tell you: whether alt text changes which product an agent picks or buys. No one has published a test showing it does, and we haven't run one. Shopify's advice to merchants is to keep product data complete and well structured, which points in the same general direction, but that's advice about data quality and says nothing specific about alt text.

So this post isn't a claim that better alt text wins you agent sales. It might help, but that hasn't been tested.

Why fix it anyway

Alt text is one of the fields an agent is handed, which makes an empty one, or one that says IMG_4021.jpg, a gap in your product data. You already had reasons to close it. A screen reader reads nothing for a blank, which is the problem our Shopify alt text guide starts from, and search engines lean on the same text to make sense of a photo. Agents are one more reader of a field that was worth filling in already.

Check your own store in ten minutes

In Shopify admin, go to Products, click Export and download the CSV. Open it and look at the Image Alt Text column. Sort by it so the blanks bunch together at the top.

Blanks are the obvious problem. Also look for text that's just a filename, the word "image," or the product title pasted onto every photo. A jacket in four colors with the same alt text on all four shots tells an agent (and a screen reader) nothing about which one is the green one.

If the damage is a few dozen products, fix it by hand. If it's a few thousand, don't run a bulk generator blind. Try it on a small batch first, the way we describe in testing an alt text generator before the bulk run.