Now that Google have announced their intention to discontinue Web Search, and replace it with LLM Summaries Only, I advice suggest to update your robots.txt to disallow Googlebot (their original search index robot).
Because after summer, there will be no web search to index your website, the data gathered by the "good" index robot will at best be discarded, or at worst, be fed to LLMs, leading to plagiarism of your content. In either scenario, no human visitors will be guided to your website.
(If you don't want to be indexed by any search engine at all, you can disallow all robots. You can also add the noindex metatag to all your pages.)
Edit: robots.txt is not a catch-all, since it is only a suggestion for "nice" crawlers, and its instructions will be ignored by "nasty" crawlers. I reworded the post from "advice" to "suggest", since this action might not actually change anything for you.





