What YandexAdditional does
YandexAdditional is a Yandex robot associated with Yandex AI, a search feature that generates concise answers to user queries by analyzing sources and compiling the findings into a response with source references. According to Yandex's documentation, these AI answers are generated automatically from pages that were already indexed by Yandex. Site owners who do not want their content used in Yandex AI answers can opt out through robots.txt.
How to control YandexAdditional
Target YandexAdditional in your robots.txt with the YandexAdditional token. Rules apply per bot, so you can allow this one while blocking others, or the reverse.
Allow YandexAdditional
User-agent: YandexAdditional
Allow: /Block YandexAdditional
User-agent: YandexAdditional
Disallow: /Robots.txt changes take effect only after Yandex robots recrawl the page, which Yandex says typically takes 2 to 14 days.
How to identify YandexAdditional
Temso identifies YandexAdditionaltraffic by matching the request's User-Agent header against this pattern. User-agent strings can be spoofed, so treat a match as an indication, not proof.
YandexAdditional(?!Bot)YandexAdditional FAQ
What is YandexAdditional?
YandexAdditional is a Yandex robot tied to Yandex AI, the feature that generates automatic answers in Yandex search from pages Yandex has indexed, with references to the source pages.
How do I block YandexAdditional?
Add a robots.txt group with "User-agent: YandexAdditional" and a Disallow rule for the content you want excluded; Yandex's documentation also accepts the related token "YandexAdditionalBot" and shows an example using it with a Disallow line to keep specific pages out of Yandex AI answers. Changes apply only after Yandex robots recrawl the page, which typically takes 2 to 14 days.
About AI Training Crawlers
Crawlers that collect content to train foundation models. Data gathered today shapes what future model versions know about your brand.
Blocking these doesn't affect live citations, but it limits what future models learn about you from your own site, leaving third-party sources to fill the gap.
