Hi folks - appreciate all the feedback here and I’ve made sure this is being communicated to the correct teams internally. Will update here when there’s more to share.
@Liam-Shopify much appreciated, waiting for news from Shopify 
Hey @Liam-Shopify
I haven’t heard back from you yet. I’m not sure where you sent the DM, it seems direct messages may be disabled in the community. Could you please confirm?
You can also reach out to me directly at: info@creatpix.com
It hasn’t even been 24 hours, have some patience.
Hey all,
Also interested in any future updates on this.
Was there an official announcement from Shopify letting us know this change was coming, or that it had been released? I’m only just hearing about it now, so I’m assuming I must have missed something, as it’s a pretty massive change for those of us dabbling in the LLMs.txt space.
Can I check which AIs have read my llm file and see their traffic?
Shopify will once again correctly redirect to llms.txt and llms-full.txt, provided these files have been created at templates/llms.txt.liquid and templates/llms-full.txt.liquid. If these files do not exist, the content of agents.md will be displayed.
What bothers me again: No changelog. A silent change. I only noticed it because of my crawler, which runs regularly.
Thanks Shopify team for listening to us and fixing it so fast!
Looks like Shopify finally mentioned this in their changelog, see here: Customize /llms.txt, /llms-full.txt and /agents.md - Shopify developer changelog
Thanks for sharing! Better late then never I guess… 
Again question, Is app devs can easily edits those template files?
You would require the write_themes scope which requires an exemption from Shopify, so most likely not.
Yeah this is the issue I’ve been trying to work with. Rendering the content without writing themes. So far the solution has been to have the store owner add the agents.md.liquid file with explicit metafield liquid and then render the metafields, but actually getting that template to render the shop metafields is the issue