Caution Reported AI & LLM Bots

Yiyan Fetcher (Baidu)

Operated by Baidu

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.

Want to see whether Yiyan Fetcher (Baidu) actually visits you? Read how do I monitor AI bot traffic to my website?

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
<meta name="robots" content="noindex, nofollow">
X-Robots-Tag header
X-Robots-Tag: noindex, nofollow

Is Yiyan Fetcher (Baidu) safe to allow?

Yiyan Fetcher (Baidu) is generally legitimate but warrants caution. It is operated by Baidu. Review its crawl behaviour in your logs and apply robots.txt or rate-limiting if its activity is heavier than you expect.
Verify by reverse-DNS lookup: legitimate Yiyan Fetcher (Baidu) requests resolve to Baidu's domain.

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 is the official user-agent string for Yiyan Fetcher (Baidu)?
The official user-agent string for Yiyan Fetcher (Baidu) is: YiyanBot. Use this exact string in robots.txt, Nginx, Apache, or Cloudflare firewall rules to target this bot. Matching in robots.txt is case-insensitive. Verify a request genuinely comes from Yiyan Fetcher (Baidu) by performing a reverse-DNS lookup on the source IP.
Is Yiyan Fetcher (Baidu) safe?
Yiyan Fetcher (Baidu) is generally legitimate but warrants caution. It is operated by Baidu. Review its crawl behaviour in your logs and apply robots.txt or rate-limiting if its activity is heavier than you expect.
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?
Yiyan Fetcher (Baidu) is operated by Baidu and is expected to fetch and parse /robots.txt before crawling, following RFC 9309. For hard enforcement, combine robots.txt with server-level IP or user-agent blocking.
How do I verify if Yiyan Fetcher (Baidu) is crawling my site?
Search your web server access logs for the string YiyanBot (case-insensitive: grep -i "YiyanBot" /var/log/nginx/access.log). Filter by user-agent in your log analytics tool (GoAccess, AWStats, etc.).

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