Google-Extended
Google-Extended is a setting in robots.txt that controls whether Google may use your content to train and ground its Gemini models, separately from normal Google Search crawling. Blocking it does not remove you from Google Search.
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What this means for your store
Google-Extended lets you make the training decision without hurting your search visibility: you can block it and still rank and appear normally in Google. Know the trade-off, though: opting out of Gemini grounding can mean Gemini has less of your content to represent you accurately.