What is Cotoyogi?
Cotoyogi is a research crawler operated by Japan's Research Organization of Information and Systems that collects web content to build AI training datasets for research purposes. You can set up Agent Analytics to see when Cotoyogi visits your website.
Overview
| Operated By | Research Organization of Information and Systems |
| Source | Official Website |
| Expected To Follow Robots.txt | Yes |
| Insights Last Updated | September 14, 2026 |
Do you operate this agent? Contact us to suggest an update.
Category
Expected Behavior
Cotoyogi tends to make broad, high-volume sweeps across many pages. Timing is unpredictable: traffic may remain heavy throughout a collection pass, then stop entirely.
Cotoyogi's User Agent
| User Agent | Mozilla/5.0 (compatible; Cotoyogi/4.0; +https://ds.rois.ac.jp/center8/crawler/) |
How To Block Cotoyogi With Robots.txt
Add this rule to your robots.txt file to block Cotoyogi from accessing your website, or use Automatic Robots.txt to block all AI data scrapers at once. You can customize which pages are blocked by swapping out / for a different path.
User-agent: Cotoyogi # https://knownagents.com/agents/cotoyogi
Disallow: /
Insights for Cotoyogi
As of September 14, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the top 1000 websites and their robots.txt files.
Robots.txt Blocked Percentage
Country of Origin
Robots.txt Blocking Trend
11% of top websites block Cotoyogi in their robots.txts.
Overall AI Data Scraper Traffic
2.8% of all web traffic came from AI data scrapers.
Top Visited Website Categories
The types of websites most frequently visited by Cotoyogi.
Frequently Asked Questions
Should I Block Cotoyogi?
Block Cotoyogi if you want more control over whether your work is used for AI training. Allowing it may increase the chance that your brand appears in AI-generated answers, but either choice leaves traditional search rankings unchanged. For context, 11% of the top websites we track currently have robots.txt rules for Cotoyogi.
Does Cotoyogi Follow Robots.txt Rules?
Yes. Cotoyogi is expected to follow robots.txt rules, so a disallow rule is the appropriate first step. Automatic Robots.txt can add and maintain that rule, while Agent Analytics lets you verify whether Cotoyogi respects it.
Does Cotoyogi Access Private Content?
Not through legitimate access. Cotoyogi primarily targets public content, but some training-data scrapers also attempt to collect gated or paywalled pages. If content loads without authentication, assume it can be collected.
How Can I Tell if Cotoyogi Is Visiting My Website?
Agent Analytics tracks Cotoyogi visits in real time. You can also check your server logs for requests whose user-agent string contains "Cotoyogi". Look for high page counts, short gaps between requests, and deep traversal through linked content. Because Cotoyogi does not publish a verification method, any client can claim its identity and a log match is only a clue.
Why Is Cotoyogi Visiting My Website?
Your content matched the criteria Research Organization of Information and Systems set for a training dataset. Cotoyogi typically discovers pages through external links, sitemaps, and seed lists rather than because someone selected your site individually.