YandexAdditionalBot
The same control as YandexAdditional under the name Yandex's example uses; either token works.
Where this comes from
- Documented by the vendor. Source: yandex.com
- Honours robots.txt.
- Counted in the readiness score. It can keep a site out of AI search or answers, so a block costs points.
In the top 1,000 websites
- 8.4% block it in robots.txt (48 of the 569 sites with a robots.txt), as of 2026-10-12.
- Method, limits and the full data: the October 2026 study of the top 1,000 websites.
What blocking it costs
Yandex AI says this token controls more than training, so a block can keep your pages out of its answers or product features. The score counts it, so a block costs points.
The robots.txt lines
To let it in (a group that names the crawler replaces any wildcard rules for it, so this also lifts a User-agent: * block):
User-agent: YandexAdditionalBot
Allow: /To keep it out:
User-agent: YandexAdditionalBot
Disallow: /A rule in robots.txt is a request. Yandex AI says this crawler honours it. The robots.txt generator writes a whole file with the same split: block the training crawlers, keep the search and answer crawlers.
Also from Yandex AI
YandexAdditional· AI answers
Does YandexAdditionalBot get through on your site?
Run the free check: it reads your robots.txt against all 51 crawlers and tells you which ones can read you, and what to change.