Google AI Search Opt-Out Controls Separated by Effect

A publisher may want to remain in ordinary Search while limiting generative answers, prevent a passage from appearing in any snippet, remove a URL from the index, block requests to a private path, or exclude content from model training. Those are different goals. Choosing a directive by the word “AI” rather than its documented effect can remove valuable Search visibility or fail to stop the intended use.

Write the desired outcome as a testable sentence: “This URL may be indexed but this price table must not appear in a snippet,” or “Gemini training should not use this host, while Google Search remains allowed.” Then choose the narrowest official control and verify it from an external fetch or product report.

robots.txt governs crawler requests, not guaranteed deindexing. noindex governs index eligibility but must be discoverable on a crawlable response. nosnippet, max-snippet, and data-nosnippet govern result previews. Google-Extended is a standalone product token for specified Gemini uses and does not control inclusion or ranking in Google Search.

Google’s newer Search control adds another layer for supported publishers and locales. Because it changes participation in AI Search features, Google warns that opted-out content will not receive the associated traffic or impressions. That is a distribution decision with an observable cost, not a harmless metadata preference.

Google announced the newer control for a subset of UK website owners in June 2026. Check the property and account directly before writing internal instructions that assume the toggle exists. Record locale, property, role, and date checked. Product screenshots and third-party summaries can become stale faster than standards-based directives.

If the toggle is unavailable, do not simulate it with an unrelated crawler block and claim equivalence. Use the controls Google documents for the exact outcome that remains available, or defer the product-specific choice. A temporary availability gap is better than a permanent accidental deindexing.

Before changing a directive, save the current robots.txt, response headers, robots meta tag, canonical, Search Console status, and relevant product setting. Deploy the narrow change, fetch the public response from outside the build environment, and confirm that caches and edge rewrites did not serve an older rule.

Allow time for recrawling before interpreting Search effects. Maintain a rollback condition and an owner. For a large site, test on a bounded path only when the control supports path-level scope; do not pretend a domain-level product toggle is a granular experiment. Legal and commercial stakeholders should review any choice that changes licensing, training, or distribution.

Use Search Console and external fetches for Google Search states, server logs for crawler requests, and the relevant product interface for account-level settings. A single absent result does not prove compliance; it may be query variation. A crawler request after a rule change may use a different agent, a cached rule, or a user-triggered fetcher.

Report the control deployed, its documented scope, the observation window, and the remaining uncertainty. Do not label Google-Extended a universal AI block or imply that blocking one agent prevents every model, feature, or third-party provider from accessing public content. The accurate answer is a matrix maintained as product documentation changes.