AI Crawlers Are Scanning Your Site Right Now - How to Check and Control Access

AI crawlers now appear in many server logs alongside traditional search bots. Some are used for search retrieval, some for training, and some for broader web indexing. If you care about AI search visibility, you need to know which ones can access your public pages.

The most common accidental blocker is simple: a robots.txt rule or CDN bot setting that prevents AI crawlers from reaching the content you want discovered.

The major AI crawler tokens to check

Here are crawler tokens you may see in logs or robots.txt rules:

Crawler names and purposes change. Always confirm against official platform documentation before making sitewide access decisions.

First, check what is actually happening

Before you change anything, find out who is already crawling. If you have server logs:

grep -E "GPTBot|OAI-SearchBot|ChatGPT-User|ClaudeBot|Claude-SearchBot|Google-Extended|CCBot|PerplexityBot" access.log

If you use Cloudflare, check bot and security events and filter by user agent.

Three quick diagnostic steps:

1. Open https://yourdomain.com/robots.txt and look for broad Disallow: / rules.
2. Confirm the sitemap is listed in robots.txt or discoverable at /sitemap.xml.
3. Use our AEO Checker to validate robots.txt and flag restrictive AI crawler rules.

The most common mistake

The blunt rule that makes sites invisible to many crawlers:

User-agent: *
Disallow: /

This blocks every well-behaved crawler that follows the wildcard rule. If you see it on a public marketing site, blog, or documentation site, it is probably too restrictive.

A more common pattern is:

User-agent: *
Disallow: /admin
Disallow: /api
Disallow: /private

This can be reasonable. The key is to make sure public content is allowed and sensitive areas are blocked intentionally.

The allow vs block decision

Allow public content when you want search and AI discovery.

Selectively block sensitive paths such as admin, account, checkout, API, and private areas.

Block completely only when you intentionally do not want a crawler to access any public content.

For most content sites, SaaS marketing sites, and documentation sites, the practical approach is to allow public pages and block private or operational paths.

Configuring robots.txt

Here is a simple template:

User-agent: Googlebot
Allow: /

User-agent: Bingbot
Allow: /

User-agent: GPTBot
Allow: /

User-agent: OAI-SearchBot
Allow: /

User-agent: ChatGPT-User
Allow: /

User-agent: ClaudeBot
Allow: /

User-agent: Claude-SearchBot
Allow: /

User-agent: Google-Extended
Allow: /

User-agent: *
Disallow: /admin
Disallow: /api
Disallow: /private

Sitemap: https://example.com/sitemap.xml

Place it at /robots.txt. Make sure it returns a 200 status and a plain text response.

What blocking actually does

Robots.txt is a crawler instruction, not an authentication system. Major well-behaved crawlers generally respect it. Bad actors may not.

If a path contains sensitive information, protect it with authentication and authorization. Do not rely on robots.txt as a security boundary.

Watch out for CDN bot protection

Even if robots.txt is correct, CDN bot protection can still block or challenge AI crawlers at the network level. If you use Cloudflare or another CDN, review bot events and WAF rules after changing crawler access.

The 5-point AI search readiness checklist

1. Robots.txt is accessible and returns plain text.
2. Sitemap is discoverable and contains canonical public URLs.
3. AI crawler rules are intentional rather than accidental.
4. LLMs.txt exists at /llms.txt if you want an AI-readable site summary.
5. Structured data is present on important pages.

Run our AEO Checker to audit these signals in one scan.

The bottom line

Most accidental AI crawler blocks come from broad robots.txt rules or CDN bot settings. Both are fixable. The right setup is not "allow everything forever"; it is to make public discovery intentional and private areas truly private.

Sources and further reading

• Google Search Central: Introduction to robots.txt
• Google Search Central: Google crawlers and fetchers
• OpenAI: Crawlers and user agents
• Anthropic: Web crawling and crawler controls
• The llms.txt proposal

Originally published at aeocheck.xyz — free AI search readiness tools.