llms.txt is a plain markdown file served at /llms.txt that gives AI systems a curated summary of a website: what it is, its most important pages, and key facts. For stores, it's a hand-written map of what you sell, pricing and policies — content you control that agents read first.

Does llms.txt replace robots.txt or sitemaps?

No. robots.txt controls access, sitemap.xml lists URLs, and llms.txt curates meaning. They're complementary: allow crawlers in robots.txt, enumerate pages in the sitemap, and explain your store in llms.txt.

SellToAgents

Standard guide · Updated July 2026 · 5 min read

llms.txt for stores: the 20-minute implementation guide

Direct answer: llms.txt is a markdown file at your domain root that gives AI agents a curated, human-written map of your store: what you sell, for whom, your best pages, and your policies. It takes 20 minutes, costs nothing, and it's the one place where you write the summary agents read — instead of hoping they infer it.

Where it goes and what it is

Served at https://yourstore.com/llms.txt, content type text/plain or markdown.
Format: an H1 title, a one-paragraph blockquote summary, then H2 sections with annotated links.
It complements — never replaces — robots.txt (access) and sitemap.xml (enumeration).

Copy-paste template for an e-commerce store

# Acme Ergonomics

> Acme sells ergonomic office furniture (standing desks,
> chairs, monitor arms) for home offices. Prices $89–$799,
> free US shipping over $50, 30-day returns, 5-year warranty.

## What we sell
- [Standing desks](/collections/desks): 12 models, $249–$799
- [Ergonomic chairs](/collections/chairs): $189–$599, wide-fit available
- [Accessories](/collections/accessories): monitor arms, mats, cable trays

## Buying info
- [Shipping policy](/policies/shipping): free over $50, 2–5 business days
- [Returns](/policies/returns): 30 days, free return label
- [Warranty](/policies/warranty): 5 years on all desks and chairs
- [Size guide](/pages/size-guide): fit by height and desk depth

## Best sellers
- [Apex Pro standing desk](/products/apex-pro): $499, dual motor, 355 lb capacity
- [DriftFlex chair](/products/driftflex): $349, wide-fit, breathable mesh

## Company
- [About](/pages/about): US-based, founded 2019, 40k+ customers
- [Contact](/pages/contact): support@acme.com, responds < 24h

The five mistakes that make agents ignore your llms.txt

Marketing copy instead of facts. "World-class comfort reimagined" tells an agent nothing. "$349, wide-fit, 30-day returns" gets you selected.
Dumping every URL. That's the sitemap's job. Curate 15–30 links that answer buyer questions.
Letting it go stale. Wrong prices in llms.txt are worse than no llms.txt — inconsistency is a trust penalty. Regenerate it when your catalog changes.
Serving HTML. It must be plain markdown text. A common failure: your 404 page returns HTML with status 200, and agents read soup.
Blocking crawlers anyway. llms.txt is useless if robots.txt blocks GPTBot and ClaudeBot from reading it. Access first (checklist, step 1).

20-minute implementation plan

(5 min) Fill in the template above with your top collections, policies and 3–5 best sellers.
(5 min) Upload it: Shopify — a small app or theme asset route; anything static — drop the file in your public root.
(2 min) Open yourstore.com/llms.txt in an incognito tab — confirm plain text, correct facts.
(3 min) Verify crawler access and everything else with a free AgentReady scan.
(5 min) Add "regenerate llms.txt" to your catalog-change checklist. Stale is the silent killer.

Did it work?

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