llms.txt check for lemonde.fr
/llms.txt on lemonde.fr returns an HTML page, not a text file, so it does not count as present.
The exact fix
Serve /llms.txt as a plain text file (Content-Type text/plain or text/markdown). Right now the address returns a web page.
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 lemonde.fr, with the exact fix for each.
Run the free check on lemonde.fr
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.