Google Says It Makes Sense To Noindex LLMs.txt
Briefly

Noindexing your LLMs.txt file can be beneficial as it might prevent it from being indexed by search engines. If indexed, users may encounter it unexpectedly, leading to confusion. The risk of unwanted linking to such files necessitates the use of noindex headers. Duplicate content concerns arise only if the content of the file matches an HTML page. There is currently no indication that AI systems utilize llms.txt files, though they are gaining adoption among websites.
Using noindex for the llms.txt file could make sense, as sites may link to it, potentially causing it to be indexed, which could confuse users.
It would only be duplicate content if the content were the same as an HTML page, which wouldn’t make sense if the file were genuinely useful.
Read at Search Engine Roundtable
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