llms.txt check for elpais.com
elpais.com has no llms.txt: /llms.txt answered 404.
The exact fix
Create a plain-text file at https://elpais.com/llms.txt. Start with # Your name, one > summary line, then ## sections with - [Page name](https://elpais.com/page): what it answers.
Next: the rest of the site
This tool reads one page and two files. The free check crawls a sample of pages and lists everything that keeps search engines and assistants from reading elpais.com, with the exact fix for each.
Run the free check on elpais.com
What a valid file does and does not do
llms.txt is a proposal for a plain-text map of your site for assistants. No major assistant has confirmed that it reads the file, so a valid file does not promise citations. It is cheap to publish and a good test of whether your own site map is in order; the crawler access check matters more.