Yiyan Fetcher (Baidu): User Agent, robots.txt Rules & Safety

Q: What user-agent string does Yiyan Fetcher (Baidu) use?

Yiyan Fetcher (Baidu) is reported to identify itself with YiyanBot. That spelling comes from ai.robots.txt, not from Baidu, which has not published crawler documentation naming it. Use it in robots.txt as the best available match, and treat a request carrying it as a clue rather than proof of who sent it.

Q: Is Yiyan Fetcher (Baidu) safe?

Yiyan Fetcher (Baidu) is rated Caution in this directory. It is a Reported token: Baidu has not published documentation for it, so its purpose, crawl rate and robots.txt behaviour are not confirmed by the operator, and anyone can send the same user-agent string. Allow or block it on its stated purpose, and back the robots.txt rule with a firewall rule if the traffic matters to you.

Q: Will blocking Yiyan Fetcher (Baidu) hurt my SEO?

✅ No SEO Impact - Blocking Yiyan Fetcher (Baidu) does not affect your rankings in Google, Bing, or any other search engine. Yiyan Fetcher (Baidu) is an AI crawler, not a traditional search indexer. You can freely block it via User-agent / Disallow: / without any SEO penalty.

Q: How do I block Yiyan Fetcher (Baidu) in robots.txt?

Add the following lines to your /robots.txt file: User-agent: YiyanBot Disallow: / This instructs Yiyan Fetcher (Baidu) not to crawl any path on your site. To block only specific sections, replace / with the path (e.g., Disallow: /blog/).

Q: How do I verify if Yiyan Fetcher (Baidu) is crawling my site?

Search your access logs for YiyanBot (for example grep -i "YiyanBot" /var/log/nginx/access.log). Because the operator publishes no IP ranges or reverse-DNS pattern, a match shows that something used the name, not that Baidu sent it.

Quick Facts

User-Agent:: YiyanBot
Category:: AI & LLM Bots
Operator:: Baidu
Safety:: Use Caution
Blocking Impact:: Low - No SEO ranking impact
SEO Impact Score:: 2/10
Official docs:: None published by Baidu
Named by:: ai.robots.txt

Reported, not operator documented

Baidu has not published a crawler page that names YiyanBot. It is listed here because a credible public source does: ai.robots.txt. Reported Baidu Yiyan token. No vendor page.

What that means for you: the robots.txt rule on this page is the best available spelling, and a well-behaved crawler using this string will honour it, but there is no vendor statement of purpose, crawl rate or robots.txt compliance to rely on. Treat a matching request in your logs as a detection clue, not proof of who sent it, and combine the rule with a firewall rule if the traffic matters to you. If the operator publishes documentation, this profile moves to Official docs.

What is Yiyan Fetcher (Baidu)?

Yiyan Fetcher (Baidu) is an on-demand AI fetcher operated by Baidu. It retrieves a page only when a user explicitly asks an AI assistant or agent to read, summarize, or act on a specific URL. Because it is triggered by real user intent rather than bulk crawling, blocking it mainly prevents users from pulling your content into Baidu's assistant.

Yiyan Fetcher (Baidu) is an on-demand AI fetcher operated by Baidu. It retrieves a page only when a user explicitly asks an AI assistant or agent to read, summarize, or act on a specific URL. Because it is triggered by real user intent rather than bulk crawling, blocking it mainly prevents users from pulling your content into Baidu's assistant.
Yiyan Fetcher (Baidu) uses the user-agent token YiyanBot. You can control it via robots.txt, meta tags (noai), or the emerging llms.txt standard. Robots.txt is voluntary; for hard enforcement, combine it with server-level IP blocking.

What happens if you block Yiyan Fetcher (Baidu)?

✅ No SEO Impact - Blocking Yiyan Fetcher (Baidu) does not affect your rankings in Google, Bing, or any other search engine. Yiyan Fetcher (Baidu) is an AI crawler, not a traditional search indexer. You can freely block it via User-agent / Disallow: / without any SEO penalty.

Generally safe to allow; provides legitimate crawling value.

How to block Yiyan Fetcher (Baidu) with robots.txt

<code>User-agent: YiyanBot</code> - Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.

Block completely (robots.txt)

User-agent: YiyanBot
Disallow: /

Allow all (robots.txt)

User-agent: YiyanBot
Allow: /

Block private only (robots.txt)

User-agent: YiyanBot
Disallow: /private/
Disallow: /api/
Disallow: /admin/
Allow: /

Nginx server block

# Nginx: Hard-block Yiyan Fetcher (Baidu)
if ($http_user_agent ~* "YiyanBot") {
    return 403 "Bot blocked";
}

Apache .htaccess

# Apache: Hard-block Yiyan Fetcher (Baidu)
SetEnvIfNoCase User-Agent "YiyanBot" bad_bot
Order Allow,Deny
Allow from all
Deny from env=bad_bot

Meta robots tag

X-Robots-Tag header

X-Robots-Tag: noindex, nofollow

Is Yiyan Fetcher (Baidu) safe to allow?

Yiyan Fetcher (Baidu) is rated Caution in this directory. It is a Reported token: Baidu has not published documentation for it, so its purpose, crawl rate and robots.txt behaviour are not confirmed by the operator, and anyone can send the same user-agent string. Allow or block it on its stated purpose, and back the robots.txt rule with a firewall rule if the traffic matters to you.

Baidu publishes no IP ranges or reverse-DNS pattern for Yiyan Fetcher (Baidu), so the user-agent string cannot be verified. Rate-limit unusual volume instead of trusting the name.

What does Yiyan Fetcher (Baidu) do?

Understanding Yiyan Fetcher (Baidu)'s purpose helps you decide whether to allow or block it.

Fetches a page only when a user asks an AI assistant to read it
Summarizes or extracts the URL the user provided
Triggered by real user intent, not bulk crawling
Low traffic volume compared with training crawlers
Blocking it prevents users from pulling your content into the assistant

Frequently Asked Questions

What user-agent string does Yiyan Fetcher (Baidu) use?

Yiyan Fetcher (Baidu) is reported to identify itself with YiyanBot. That spelling comes from ai.robots.txt, not from Baidu, which has not published crawler documentation naming it. Use it in robots.txt as the best available match, and treat a request carrying it as a clue rather than proof of who sent it.

Is Yiyan Fetcher (Baidu) safe?

Yiyan Fetcher (Baidu) is rated Caution in this directory. It is a Reported token: Baidu has not published documentation for it, so its purpose, crawl rate and robots.txt behaviour are not confirmed by the operator, and anyone can send the same user-agent string. Allow or block it on its stated purpose, and back the robots.txt rule with a firewall rule if the traffic matters to you.

Will blocking Yiyan Fetcher (Baidu) hurt my SEO?

✅ No SEO Impact - Blocking Yiyan Fetcher (Baidu) does not affect your rankings in Google, Bing, or any other search engine. Yiyan Fetcher (Baidu) is an AI crawler, not a traditional search indexer. You can freely block it via User-agent / Disallow: / without any SEO penalty.

How do I block Yiyan Fetcher (Baidu) in robots.txt?

Add the following lines to your /robots.txt file:

User-agent: YiyanBot
Disallow: /

This instructs Yiyan Fetcher (Baidu) not to crawl any path on your site. To block only specific sections, replace / with the path (e.g., Disallow: /blog/).

Does Yiyan Fetcher (Baidu) respect robots.txt?

Not documented. Baidu has published no statement that Yiyan Fetcher (Baidu) reads robots.txt. A rule for YiyanBot will stop a client that chooses to honour it; for enforcement, add a firewall or CDN rule as well.

How do I verify if Yiyan Fetcher (Baidu) is crawling my site?

Search your access logs for YiyanBot (for example grep -i "YiyanBot" /var/log/nginx/access.log). Because the operator publishes no IP ranges or reverse-DNS pattern, a match shows that something used the name, not that Baidu sent it.