Shopify llms.txt checker: what does your store tell ChatGPT?

Q: Can I upload an llms.txt to Shopify?

Yes. Since May 2026 you do it with a theme template called llms.txt.liquid, with no apps and no access to your domain root.

What changed in Shopify

On May 28, 2026, Shopify started publishing three files on every store: /agents.md, the main document for AI agents that shop on a buyer's behalf, plus /llms.txt and /llms-full.txt, which are copies of it by default.

Shopify writes that text, not you. It explains how to use the cart, Shop Pay, and its integration with assistants. It doesn't explain what you sell, what your categories are, your shipping terms, or where your blog lives. If an assistant reads your llms.txt to understand your store, it finds checkout instructions.

How to add your own, no app needed

In your Shopify admin, go to Online Store → Themes and, on your published theme, open Edit code.
In the templates folder, create a new file called llms.txt.liquid.
Paste your llms.txt inside (this tool builds one from your store's data), save, and open yourstore.com/llms.txt to check it.

Why llms.txt.liquid and not agents.md.liquid

If you edit agents.md.liquid, you change all three files at once, including the one agents use to buy from your store. With llms.txt.liquid you change only the llms.txt, and the rest stays as Shopify maintains it. It's the safe choice.

One technical detail: that template can't read your collections or blog posts with Liquid. The text is written as is, so if your categories change, you have to update it by hand.

What it checks (and what it doesn't)

It checks

Whether your /llms.txt and /agents.md are Shopify's default text or your own.
If yours is your own, whether it names your categories, your policies (shipping, returns), and your blog.
Whether your site runs outside the Shopify theme (headless), where the template doesn't apply.

Worth knowing An llms.txt doesn't improve your Google rankings, and no assistant has confirmed it always reads one. It's signposting: it helps assistants describe you accurately when they do read you. It takes twenty minutes, and that's why it's worth doing, not because it guarantees anything.

Frequently asked questions

Is it free?

Yes. No sign-up, and no app to install on your store.

Can I upload an llms.txt to Shopify?

Yes. Since May 2026 you do it with a theme template called llms.txt.liquid, with no apps and no access to your domain root. The steps are above.

Do I need to touch agents.md?

No. The agents.md file is what agents read when they buy from your store, and Shopify keeps its version up to date. Change only the llms.txt.

My store is headless. What do I do?

If your site is served by Hydrogen or another frontend, the file is published on that frontend, like any other file at the root. The Shopify theme template doesn't reach it.

Want the full context? It's in the llms.txt guide for online stores.

Last updated: October 2026.