§ 01 Definition
What Shopify Catalog is
Shopify Catalog is a comprehensive global catalog of eligible products that are sold by stores on Shopify — verbatim from Shopify's own help page. AI channels that access Shopify Catalog can use product data to power discovery, ranking, and recommendations. It is not an app, not a setting, not a separate feed to maintain; it's the underlying syndication layer that a Shopify store is automatically part of when it meets the requirements.
The Catalog page1 opens with that definition and immediately lists where Catalog products appear: Shop, select AI platforms, shopping sites, AI agents, and agentic storefronts. The Catalog is not Google Merchant Center, not the Shopify Markets feed, and not the per-channel feeds individual apps generate. It is Shopify's first-party syndication primitive for the AI shopping era — generally available since the Winter '26 Edition rolled out the Catalog API and MCP to all developers8.
§ 02 Eligibility
Who's in (and who isn't)
Catalog eligibility has store-level and product-level gates. Store: Starter plan or higher, not password-protected, ships to the United States or Canada, follows the Terms of Service and Acceptable Use Policy. Product: title, at least one image, price over $0, identifiable URL, not Unlisted, no mature content. Six conditions on the store, five on each product. Missing any one disqualifies the product, not the store.
The verbatim list lives on the Catalog requirements page2. Two gates are easy to miss: Hydrogen and Headless storefronts qualify but require the correct route format, and Agentic-plan stores must include an external product URL on every product because the AI channel has nowhere else to deep-link from. The full eligibility article walks every gate including the ones merchants stumble on (password protection, country restrictions, free products).
§ 03 Distribution
Where Catalog products appear
The Catalog page lists five surfaces: Shop, select AI platforms, shopping sites, AI agents, and agentic storefronts. The Agentic plan page is more specific and names the AI channels: ChatGPT, Google AI Mode and Gemini, Microsoft Copilot, Perplexity, the Shop app, with 'more coming soon.' ChatGPT is a discovery-focused referrer; the other channels support direct checkout inside the AI conversation.
Across Shopify's own surfaces14, the named channels are consistent: ChatGPT, Copilot, Gemini and Google AI Mode, Perplexity, Shop. ChatGPT's distinct role — discovery-focused referrer instead of in-chat checkout — is documented on the Agentic Storefronts page4. The full distribution article covers each surface's checkout model, citation behavior, and attribution.
§ 04 The fields
Which product fields Shopify Catalog reads
Shopify's optimizing-products-for-Catalog doc names seven fields: title, description, images, product organization (Type, Vendor, Collections, Tags), barcode (ISBN, UPC, GTIN), variants (including Option name), and external product URL for Agentic-plan stores. Each is a structured input the AI channel reads alongside the page itself. Title is the discovery hook; barcode is the cross-channel identifier; variants disambiguate; organization classifies; external URL deep-links.
The doc3 sits separately from the SEO field guidance and warns that product policies should be "complete and up-to-date" so AI agents reference accurate return and other policy information. The combined surface is: seven structured product fields + the entire policies layer + the Knowledge Base FAQs that draw from those policies. The field-by-field article covers each one with a rewrite checklist.
§ 05 The wedge
Catalog eligibility is not AI visibility
A store can clear all eleven Catalog gates and still see zero recommendations in ChatGPT. Eligibility is the inclusion test; visibility is the ranking outcome. Shopify is explicit about this in the Agentic Storefronts admin description — the new admin page exists precisely to show 'which queries you rank for' and 'recommendations to improve your product data.' That phrasing is Shopify acknowledging that being in the Catalog is not the same as being recommended out of it.
The admin description, verbatim from the changelog5: "track performance across all major AI channels, see which queries you rank for, and get recommendations to improve your product data." Three of those five clauses are about visibility, not eligibility. The wedge: every page on this site is the gap between the two.
§ 06 Controls
What Shopify lets you control
You cannot opt out of Shopify Catalog itself — Shopify states that verbatim. What you can do: selectively block individual AI channels from accessing products through Shopify Catalog controls. Two settings appear in the Agentic admin: 'Shopify Catalog access' and 'Direct checkout.' The first removes the product from a channel's recommendation pool. The second leaves recommendations on but routes checkout back to the merchant's storefront instead of completing in-chat.
The verbatim opt-out passage1: "you can't opt out of Shopify Catalog itself." The per-channel controls — Catalog access and Direct checkout — let a merchant tune which AI surfaces touch a product and how the checkout flows. The opt-out article and the direct checkout article walk both controls; the Agentic admin makes both visible at admin.shopify.com/agentic5.
§ 07 Leaves
The 8 articles under this cluster
Eight articles go deeper than this hub. Eligibility, fields, distribution, opt-out, direct checkout, the 'not eligible' diagnostic, the 'eligible but invisible in ChatGPT' diagnostic, and the Catalog vs Google Merchant Center comparison. The order matches a merchant's natural escalation path — the easier checks first, the structural diagnostic last.
- 01 REFERENCE Shopify Catalog eligibility Shopify Catalog eligibility — store + product requirements Starter plan, US/CA shipping, title + 1 image + price > $0 — the verbatim requirements from Shopify's own page, plus the edge cases. 8-min read →
- 02 REFERENCE Shopify Catalog product fields Which product fields Shopify Catalog actually reads Title, description, images, product organization, barcode, variants, external URL — Shopify's own optimization list, walked field by field. 9-min read →
- 03 EXPLAINER Shopify Catalog distribution channels Where Catalog products appear Shop, ChatGPT, Copilot, Gemini, Perplexity, agentic storefronts — the six surfaces Catalog feeds, and what each one does differently. 8-min read →
- 04 DIAGNOSTIC opt out of Shopify Catalog Can you opt out of Shopify Catalog? The verbatim Shopify answer: no — but you can block individual AI channels using Catalog access and Direct checkout settings. 7-min read →
- 05 HOW-TO Shopify Catalog direct checkout Direct checkout settings inside Catalog How Direct checkout differs from Catalog access, what toggling it off costs in AI conversion, and which channels honor each. 7-min read →
- 06 DIAGNOSTIC Shopify products not in Catalog Why my Shopify products aren't in Catalog The diagnostic flowchart — six gates, in the order Shopify itself documents, plus the ones merchants forget (password protection, hidden status, country). 8-min read →
- 07 DIAGNOSTIC Shopify Catalog not showing in ChatGPT Eligible but ChatGPT still doesn't show my products The 2026 'eligible-but-invisible' problem: ChatGPT is a discovery referrer, not a guaranteed surface. Five reasons a Catalog product still won't appear. 10-min read →
- 08 EXPLAINER Shopify Catalog vs Google Merchant Center Shopify Catalog vs Google Merchant Center Two product feeds, two purposes — one for AI shopping channels, one for Google Shopping. How they overlap, where they don't, and why both still matter. 9-min read →
