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

AI Data Scraper
Downloads website content to include in datasets used for training AI models such as LLMs

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

11%
11% of top websites are blocking Cotoyogi
Learn How →

Country of Origin

Japan
Cotoyogi normally visits From Japan

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

Business and Industrial
Reference
News
People and Society
Travel and Transportation

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.