Cotoyogi is a bot in the AI crawlers category, operated by Research Organization of Information and Systems.
By providing a centralized management environment for content and models, we will build a framework that promotes both data utilization and research and development of AI technology, and realize the following functions as Japan's future information infrastructure.
AI crawlers collect web pages in bulk to build training data for large language models and other AI systems. They take content without sending visitors back. Most publishers block them in robots.txt or at the WAF unless they have a licensing deal with the operator.
Cotoyogi identifies itself with this user agent string:
Mozilla/5.0 (compatible; Cotoyogi/4.0; +https://ds.rois.ac.jp/center8/crawler/)Anyone can copy a user agent string. Transfon Security also checks where each request comes from, so a request that claims to be a known crawler but comes from the wrong network is treated as a fake, not as the real crawler.
Cotoyogi follows robots.txt, so these rules stop it crawling the paths you choose. robots.txt is a plain text file at the root of your domain, such as https://example.com/robots.txt.
User-agent: Cotoyogi Disallow: /
User-agent: Cotoyogi Disallow: /private/ Disallow: /search
User-agent: Cotoyogi Allow: /blog/ Disallow: /
User-agent: Cotoyogi Allow: / User-agent: * Disallow: /
User-agent: Cotoyogi group, Cotoyogi ignores your User-agent: * rules, so repeat any that should still apply.Cotoyogi from Cotoyogi's user agent; check Research Organization of Information and Systems's own documentation if it publishes a different robots.txt name.Treat robots.txt as a statement of your policy, and enforce it where requests arrive.
Cotoyogi takes articles for AI training without sending readers back, and its page loads count as invalid traffic if your ad tags fire. Decide whether to license, limit or block it, and keep it out of ad requests.
Transfon Security for publishersVisits from Cotoyogi to your landing pages are not people. Keep them out of conversion, retargeting and audience data so you do not pay to reach a crawler.
Transfon Security for advertisersCotoyogi can copy product descriptions, prices and reviews in bulk. Allow it on pages you want AI models to know about and block it on search, cart and account pages.
Transfon Security for e-commerceCotoyogi can fetch documentation and public app pages at scale. Rate limit it so it does not slow the product for paying users.
Transfon Security for SaaS and APIsrobots.txt is a request, not an enforcement. Transfon Security shows Cotoyogi by name in the Top Bots report, so you can see how often it visits and which pages it reads. Block or allow it with a User Agent rule, or slow it down with a rate limit decision rule.
Transfon Security
Cotoyogi is a bot in the AI crawlers category, operated by Research Organization of Information and Systems. By providing a centralized management environment for content and models, we will build a framework that promotes both data utilization and research and development of AI technology, and realize the following functions as Japan's future information infrastructure.
Yes. Cotoyogi follows robots.txt, so a Disallow rule for the Cotoyogi user agent stops it from crawling the paths you list.
Add "User-agent: Cotoyogi" followed by "Disallow: /" to the robots.txt file at the root of your site. To enforce it, block requests whose user agent contains "Cotoyogi/" at your WAF. In Transfon Security that is one User Agent block rule.
No. robots.txt is voluntary, so Cotoyogi may not follow it, and anyone can send Cotoyogi's user agent, so a fake Cotoyogi ignores your rule. Enforce the rule where requests arrive, at your WAF, and check the source network.
AI crawlers collect web pages in bulk to build training data for large language models and other AI systems. They take content without sending visitors back. Most publishers block them in robots.txt or at the WAF unless they have a licensing deal with the operator.
Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.
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