#BlinkTank: Shopify gives merchants control over their AI agent files
Over the last couple of months, the AI infrastructure underneath Shopify stores has shifted a lot - llms.txt appeared with no announcement, redirected to agents.md with no announcement, the Agentic dashboard appeared, UCP turned on by default, Universal Cart launched at I/O. Throughout all of it, Shopify said almost nothing. It just happened.
The lead story this week might seem small. What makes it worth paying attention to though is that it is the first time anything about these files has appeared in Shopify's changelog at all - and after months of infrastructure arriving without comment, that is itself interesting.
Also in this issue: the Google May core update has had another significant weekend, Google launched Conversational Attributes in Merchant Center at Marketing Live - which got less attention than it deserved - and we are announcing a partnership between Blink and Fountain that gives our clients a way to find out exactly how much of their paid search spend is buying traffic their organic rankings would have won anyway.
Shopify documents agents.md, llms.txt and llms-full.txt for the first time
On 28 May, Shopify published a changelog entry on how to customise the three AI discovery files now present on every store. There are two things about it that matter, and they are quite different from each other.
The second is what the functionality actually is. Shopify is not shipping new capability here - it is documenting that an existing mechanism applies to these paths. This is the same one that has always governed robots.txt on Shopify: drop a templates/robots.txt.liquid into your theme and your version wins over the platform default.
Shopify is confirming that templates/agents.md.liquid, templates/llms.txt.liquid and templates/llms-full.txt.liquid work exactly the same way. If a custom template exists for a path, that serves. If not, it falls back to the agents.md template, then to the Shopify-generated default.
The practical implication of this falls into two different parts. The first is what you can do: merchants now have a defined route to customise what these files say, using the same Liquid templating mechanism that has always governed robots.txt.
The auto-generated content is identical boilerplate across every store - it tells an agent how to transact, but nothing distinctive about what a particular store sells. If you want to change that, you now know how.
The second - and perhaps more important - question is whether it matters. The answer there is less clear. There is still no evidence that agents.md is being actively used by AI shopping agents at any scale.
Knowing you can customise the file is useful; whether doing so will make a commercial difference in the near term is a different question, and anyone who tells you they know the answer with confidence is guessing.
🔗 Shopify developer changelog: Customise /llms.txt, /llms-full.txt and /agents.md
The May core update had a significant weekend
The May core update started rolling out on 21 May and was expected to complete around 4 June - this Wednesday. It has not gone quietly. Search Engine Roundtable reported significant ranking volatility on Saturday 30 May, marking the second spike during the rollout after an earlier wave the weekend of 23-24 May. Third-party tracking tools were showing intense movement across the weekend.
If you are still seeing unexpected changes in Search Console, the update is likely still settling. The guidance remains the same: wait for completion before drawing conclusions or making structural changes. Once it has finished, the right comparison in Search Console is the seven days before 21 May against the equivalent period after the rollout is complete - not against the volatile window in between.
🔗 Search Engine Roundtable: Google May 2026 core update
Google moved Preferred Sources into AI Overviews
On 27 May, Google confirmed that Preferred Sources - the feature that lets users nominate websites they want highlighted in search - is now active inside AI Overviews and AI Mode. Users visit source preferences in their Google settings, add any site that publishes fresh content, and that site gets a "Preferred" label wherever it appears in AI-generated responses. Google says people are twice as likely to click through to a Preferred Source.
We have added a "Set Blink as a Preferred Source on Google" button to our blog as an experiment - if you would like to try it: google.com/preferences/source?q=blinkseo.co.uk. For stores that publish consistently and have an engaged readership, it is worth testing as a subscriber or customer CTA.
🔗 Google blog: New ways to find your favourite sources and original content in AI Search
Google launched Conversational Attributes in Merchant Center
This came out of Google Marketing Live on 20 May and got less attention than it deserved, buried under the Universal Cart and UCP coverage.
Conversational Attributes are a new set of product data fields in Merchant Center, designed specifically for how people search in AI Mode. The premise is that conversational search queries are more detailed and nuanced than keyword-based ones - someone asking an AI assistant what to buy is asking a different kind of question than someone typing keywords into a search bar. The new attributes allow merchants to add richer, more descriptive product data that Google's AI systems can use to match products to those conversational queries across AI Mode, Gemini, and other AI surfaces.
The specific fields include things like question and answer pairs - essentially FAQ content at the product level that feeds directly into the Merchant Center data rather than sitting on a product page. Google describes it as complementing existing feed data rather than replacing it.
For large-catalogue Shopify stores the relevance is direct. The stores that perform best in AI-powered discovery are the ones where the product data is specific enough to answer the kind of questions a shopper would actually ask. That has always been true in organic search; it applies equally here. Conversational Attributes is how Google is asking merchants to act on it inside Merchant Center.
🔗 Google: Conversational Attributes in Merchant Center
Blink and Fountain Partnership are bringing OneSearch to Shopify clients
Last week we announced winning Best SEO Agency at the National Digital Awards. This week, something equally as good.
Blink is partnering with Fountain Partnership to bring OneSearch to our Shopify clients.
OneSearch is a keyword-level paid/organic cannibalisation tool. It connects to a Google Ads account, identifies terms where there is a plausible cannibalisation risk, and then runs structured tests at the keyword level to find out which paid clicks are genuinely incremental and which are buying traffic the organic listing would have won anyway. The output is not a blanket pause list - it is an evidence-led picture of which terms can be turned down without losing revenue. An incrementality test run at the level of the actual search term rather than the campaign or channel.
The tool is built for brands spending £30k a month or more on Google Ads, ideally £100k plus. In that bracket, the saving is typically in the 10-30% range. That saving can be reinvested into paid spend, CRO, or the foundational work we are usually recommending alongside it - taxonomy expansion, product data, technical fixes - which tends to deliver around 20% year-on-year growth. The OneSearch saving effectively funds that growth lever without any net increase in marketing spend.
If you run a large-catalogue Shopify store spending somewhere in that bracket and want to find out more, reply to this email.
New on the Blink blog: mega menus on Shopify
We have published a new piece on mega menus - specifically why they matter more on Shopify than on other platforms. The argument is structural: Shopify's flat collection architecture puts more load-bearing weight on the mega menu than most merchants realise. Worth reading if you think of it primarily as a UX decision.
🔗 blinkseo.co.uk: How a mega menu works and why it matters more on Shopify
Blink releases Shopify Metafield Groups Chrome extension
Andy has built and released a Chrome extension that does something useful and specific: it visually organises metafields in the Shopify admin by grouping related fields under labelled, colour-coded headings.
If you manage products with a lot of metafields, you will know that the default view is a long undifferentiated list that gets increasingly hard to navigate as your data structure grows. This fixes that without touching your store - it works entirely in the browser, makes no API calls, and does not collect or transmit anything.
It is available now on the Chrome Web Store and free to install.
🔗 Shopify Metafield Groups on the Chrome Web Store
🔗 tools.blinkseo.co.uk/metafield-groups
Jobs
Hiring:
Brockbank are looking for a Head of Ecommerce. Brockbank is a long-established UK brand - a good role if you want strategic ownership of ecommerce at a heritage business.
Showpo are hiring an Ecommerce Specialist in Sydney. Showpo is a globally scaled Australian fashion brand operating across AU, US and UK on Shopify and Hydrogen. The role sits across trading, SEO, content and tech stack - Shopify, Nosto, Sanity. Worth a look if you want to work on a genuinely large-catalogue operation at scale.
Looking for work:
Derek Nicholson is an ecommerce and digital specialist whose contract ended in April and is open to new roles.
Paul Kennedy is an ecommerce professional open to new opportunities.
Muhammad Amir is an email and SMS specialist with six years of experience in retention marketing, open to new roles.
If you are hiring and the role fits someone with large-catalogue Shopify experience, or you are looking and have that background, send me a message.
Partner shout-out
We have worked with a lot of paid media agencies over the years. Adam and Laura at &Allies are Meta specialists, and genuinely senior ones - the kind of people who add strategic value than just running the account, which is sadly all too rare. We've been consistently impressed, and if you are looking for a new Meta partner, they are highly recommended.
🔗 andallies.co.uk
If you found this useful, I would love it if you could share it with someone you think would find it interesting - whether that is someone managing a large-catalogue Shopify store or anyone else who follows this kind of thing.
See you next week.
Sam
Who am I and what does Blink do?
I'm Sam Wright, Managing Director and co-founder of Blink SEO. We're a search marketing agency that works exclusively with large-catalogue Shopify stores - the kind where the challenge isn't just visibility, but helping customers find the right product in the first place.
We specialise in SEO and PPC for merchants managing hundreds or thousands of products. Most of our work starts with taxonomy: how a store is structured and categorised, and what that means for organic performance, paid efficiency, and on-site discovery.
If you found this useful and aren't already subscribed, you can sign up at blinkseo.co.uk/blinktank.
If you run a large-catalogue Shopify store and want to talk about organic or paid performance, reply to this email or find me at blinkseo.co.uk.