llms.txt for Shopify
You probably already have one
Shopify generates an agent-instruction surface for every store: a default /agents.md, with /llms.txt and /llms-full.txt mirrored from it (as of May 2026). Check yours right now — open https://your-store.com/llms.txt. If you've never touched it, you're serving Shopify's default.
That default is generic by design. The question isn't "how do I add llms.txt to Shopify" — it's "should I replace the stock one," and usually yes: the default can't know which collections matter, what your return policy highlights should be, or that your MCP endpoint exists.
How the template system works
Per Shopify's theme docs, three Liquid templates control the three paths, with a fallback chain:
templates/llms.txt.liquid— controls/llms.txtonlytemplates/agents.md.liquid— controls/agents.mdand is the default source for the other paths- No templates → Shopify's generated default
So the leverage point is agents.md.liquid: customize it once and all three surfaces inherit, or split llms.txt.liquid out separately if you want the index and the instructions to diverge (see AGENTS.md vs llms.txt for why you might).
Customizing it
In your theme editor (Online Store → Themes → Edit code → Templates), add llms.txt.liquid:
# {{ shop.name }}
> {{ shop.description }}
## Key pages
- [Best sellers](/collections/best-sellers): our most-bought products
- [Shipping & returns](/policies/shipping-policy): what agents should quote customers
## Machine-readable surfaces
- [Product feed](/products.json): live catalog with prices
Liquid objects work as in any template, so the file can stay current automatically — loop collections, inject policies, reference metafields.
What to include
The highest-value lines for agents: your top collections with one-line descriptions, policy pages (shipping, returns — what an agent quotes a customer), and cross-references to machine surfaces (/products.json, any OpenAPI spec or MCP endpoint). Skip marketing prose — agents want structure, not slogans. Full format guidance: the llms.txt guide.
Validate it
Run your store through the llms.txt validator — it checks the file exists, parses, and gives agents navigable structure — or scan the whole store to see every agent-facing surface at once.
FAQ
Does Shopify generate llms.txt automatically?
Yes — every store serves a default /agents.md, and Shopify manages /llms.txt and /llms-full.txt by mirroring it. You override any of the three with Liquid templates.
Which template should I edit?
Edit templates/agents.md.liquid to change all three surfaces from one source. Add templates/llms.txt.liquid only if you want the llms.txt index to differ from the agents.md instructions.
Will editing llms.txt affect my Google rankings?
No — Google has documented that Search doesn't use llms.txt either way. Its value is for agents reading your store, not for rankings. See Does llms.txt actually work?