What Did Google Change on October 21?
Google added four existing options to a help page that had not listed them, and made minor wording changes. Its Search Central documentation log, entry dated October 21, 2026, says the “control what you share with Google Search documentation” was updated “to include existing options such as the robots meta tag, data-nosnippet, X-Robots-Tag, and the Search generative AI control, along with minor clarifications that the page applies to Google Search.” Under “Why,” the log says: “To keep the page fresh and reflect the current set of options available to site owners” (Google Search Central updates).
Search Engine Roundtable, which reported the change the same day, published a document comparison showing the two new sections, “Use robots meta tag, data-nosnippet, or X-Robots-Tag” and “Use the Search generative AI control” (Search Engine Roundtable). When we read Google’s page on October 21, 2026, it showed “Last updated 2026-10-21 UTC” (Google Search Central).
Nothing about how any option behaves was announced. The value of the edit is that one Google page now lists every route in one place, including the AI control that site owners previously had to find in Search Console Help.
What Are the Seven Methods Google Lists?
The page gives three reasons to keep content out of Search (to restrict data, to hide content of less value to the audience, and to focus Google on important content) and then lists seven methods (Google Search Central). The right-hand column says what Google’s other pages say about AI Overviews and AI Mode for each method; it reflects the pages we read, not tests.
| Method on Google’s page | Applies to, per the page | What Google’s pages say about AI Overviews and AI Mode |
|---|---|---|
| Remove the content from your site | All content types | Not addressed; Google calls removal “the best way to ensure that it won’t appear in Google Search and anywhere else on the Internet” |
| Password-protect your files | All content types | Not addressed separately |
Use the noindex rule | All content types | Listed on the AI features page among controls to “limit the information shown from your pages in Search”; the Search generative AI control help page points to noindex to block content from Search “completely” |
| Disallow crawling with robots.txt | Images and video | The AI features page calls robots.txt directives for Googlebot “the control for site owners to manage access to how their sites are crawled for Search” |
Use robots meta tag, data-nosnippet or X-Robots-Tag | Various content types, depending on the implementation | nosnippet and max-snippet are documented as limiting direct input to AI Overviews and AI Mode; data-nosnippet is listed on the AI features page; any meta-tag rule can also be sent as an X-Robots-Tag header |
| Use the Search generative AI control | Site-wide | Covers AI Overviews, AI Mode and generative AI features in Discover |
| Opt out of specific Google properties | Web pages (for example Google Shopping, Google Hotels and vacation rentals) | Not addressed |
Sources: Control what you share with Google Search; AI features and your website; Robots meta tag, data-nosnippet and X-Robots-Tag specifications; Search generative AI control. All read October 21, 2026.
Which Setting Reaches AI Overviews and AI Mode?
Two are documented directly. The first is the Search generative AI control in Search Console, under Settings, then Search generative AI. Google says that as of August 31, 2026 it has “rolled out this control to all websites worldwide,” and that it manages inclusion in AI Overviews, AI Mode and “Generative AI features in Google Discover,” adding: “We expect to update this list over time” (Google Search Console Help).
The control has three values. Include is “the default control for all properties.” Exclude keeps a site’s links and content out of these features, and Google warns: “You won’t receive any traffic or impressions from these features.” Inherit from parent is the default for a property that has a parent property (Google Search Console Help).
The second is the snippet rules. Google’s robots meta tag page says nosnippet “will also prevent the content from being used as a direct input for AI Overviews and AI Mode,” and that max-snippet “will also limit how much of the content may be used as a direct input” for those features. The max-snippet limit does not apply “in cases where a publisher has separately granted permission for use of content,” for example through in-page structured data or a license agreement with Google (Google Search Central). That page showed a last-updated date of March 24, 2026 when we read it.
Our guides cover the page-level mechanics: see how to control snippets and AI Overviews, what a robots meta tag is and how AI Overviews and AI Mode differ.
What Does the Search Generative AI Control Not Do?
It does not remove a site from regular results and does not stop AI training. Google says: “this control isn’t used as a ranking or inclusion signal affecting other parts of Search.” It also says: “This control doesn’t affect AI training; to limit training of the models used to generate responses in Search generative AI features, use Google-Extended. To block your content from appearing in Google Search completely, use noindex” (Google Search Console Help).
Excluding a site does not remove the topic from AI answers either. Google notes that “Content from other sites will still be available in those features, and it may appear similar to yours,” and that a site’s content “may still be used to power Google Search as a whole” (Google Search Console Help).
Changes are not instant. Google says it “generally takes a few days” for content to be excluded, that content “will be excluded within 1-2 days after the control goes live,” and that some content may take longer “due to caching and propagation across Google systems” (Google Search Console Help).
The control works by Search Console property. By default, a property inherits the setting of “its closest parent that has changed its control to stop inheriting,” and otherwise that of its top-level domain property (Google Search Console Help). A company whose pages sit in a folder of someone else’s domain, such as a contributor section on a news site, has no say over this setting for those pages.
Does Google’s Other AI Page Say the Same?
Not quite. Google’s “AI features and your website” page, last updated December 10, 2025, says robots.txt directives for Googlebot are the crawl control, that site owners should “use nosnippet, data-nosnippet, max-snippet, or noindex controls” to limit what is shown, and that Google-Extended limits “AI training and grounding in some of Google’s other systems.” It does not mention the Search generative AI control (Google Search Central).
The two pages do not contradict each other; the older one simply predates the control’s worldwide rollout. Where the lists differ, we suggest treating the Search Console Help page and the setting in Search Console itself as the current description of the control, and the robots meta tag page as the source for page-level rules.
What This Means for Anyone Buying a Placement
A placement on someone else’s site is governed by that site’s settings. If the publisher has set the Search generative AI control to Exclude, or uses nosnippet on the page, Google’s documentation says the page will not feed AI Overviews or AI Mode in the ways described above. A reader cannot see the Search Console setting from outside; nosnippet and max-snippet are visible in the page source.
- Ask before you count AI visibility. Our recommendation, not a Google rule: if part of a placement’s value to you is that AI search might draw on it, ask the outlet whether its property is excluded and whether the page carries snippet restrictions.
- Do not pay for promised AI citations. Neither the outlet nor anyone selling the placement controls whether Google uses a page in an AI answer. A paid article is advertising and must be labeled; see how paid content must be labelled.
- Decide your own site’s setting deliberately. Excluding your property means, in Google’s words, no traffic or impressions from these features; including it keeps the default. Google says neither choice affects rankings elsewhere in Search.
Methodology and Limitations
Four limits apply. First, we read Google’s pages on October 21, 2026, the day of the update, and rely on Google’s log and Search Engine Roundtable’s comparison for what changed. Second, we tested none of the settings. Third, where the table says “not addressed,” the pages we read were silent, which is not the same as Google saying there is no effect. Fourth, Google says the list of features the control covers will change.
Conclusion
Google’s October 21 edit tidied a help page; it did not add a setting. Its practical use is as a checklist: seven ways to limit what Google shows, of which two, the Search Console control and the snippet rules, are the ones Google documents for AI Overviews and AI Mode. Anyone who wants to limit AI use of their pages, or who is paying for coverage partly for its AI reach, should check which of those is actually set.
Frequently Asked Questions
What did Google change on its “Control what you share” page?
On October 21, 2026, Google added the robots meta tag, data-nosnippet, X-Robots-Tag and the Search generative AI control to the page’s list of methods, with minor clarifications. Its log says these options already existed.
Which Google setting keeps a site out of AI Overviews and AI Mode?
The Search generative AI control in Search Console, set to Exclude, covers AI Overviews, AI Mode and generative AI features in Discover, according to Google’s help page. Google says excluded sites get no traffic or impressions from those features.
Does nosnippet stop a page from being used in AI Overviews?
Google’s robots meta tag page says nosnippet “will also prevent the content from being used as a direct input for AI Overviews and AI Mode.”
Does the Search generative AI control stop Google training AI on my site?
No. Google says the control “doesn’t affect AI training” and points to Google-Extended to limit training of the models used in these features.
Will excluding my site from AI features hurt my rankings?
Google says the control “isn’t used as a ranking or inclusion signal affecting other parts of Search.” We have not tested this.
How long does a change to the control take?
Google says it generally takes a few days, with content excluded within 1-2 days after the control goes live, though caching can delay some content.
Sources and Methodology
This guide is built from five Google pages and one trade report, all read on October 21, 2026. Statements about what each setting does are Google’s; the advice to ask publishers about these settings is our recommendation, not a Google rule. We did not test any setting.
- platform documentation Google Search Central, Documentation updates. Supports the October 21, 2026 entry and its stated reason. Read October 21, 2026.
- platform documentation Google Search Central, Control what you share with Google Search, last updated October 21, 2026. Supports the seven methods. Read October 21, 2026.
- platform documentation Google Search Console Help, Search generative AI control. Supports coverage, values, rollout, training, ranking, timing and inheritance statements. Read October 21, 2026.
- platform documentation Google Search Central, Robots meta tag, data-nosnippet, and X-Robots-Tag specifications, last updated March 24, 2026. Supports nosnippet, max-snippet and X-Robots-Tag statements. Read October 21, 2026.
- platform documentation Google Search Central, AI features and your website, last updated December 10, 2025. Supports the controls it lists and the absence of the Search Console control. Read October 21, 2026.
- trade press Barry Schwartz, Search Engine Roundtable, Google Updates Control What You Share With Google Search With Existing Options, October 21, 2026. Supports the document comparison. Read October 21, 2026.