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Do not automatically block every AI crawler. A better policy separates three goals that are often confused: keeping pages discoverable in AI-powered search, declining use of your content for model training, and stopping automated access to sensitive material. Use robots.txt to state preferences to compliant crawlers, but treat it as a voluntary signal rather than a security control. For private data or abusive traffic, add authentication, firewall, WAF, or bot-management rules. You can, for example, disallow GPTBot, ClaudeBot, and Google-Extended while allowing OAI-SearchBot so your pages remain eligible for ChatGPT search discovery.
What does blocking an AI crawler in robots.txt actually do?
A robots.txt rule tells a named crawler which URL paths it may request; it does not erase published pages, revoke previously collected copies, or authenticate a visitor. Google describes the file as telling crawlers which URLs they can access, while Cloudflare notes that compliance is voluntary. A well-behaved bot reads the file before crawling, but an operator can ignore it or impersonate another user agent.
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- Express a preference that a particular vendor not fetch a site or path.
- Separate training-related crawlers from search or user-request crawlers when a vendor documents separate identities.
- Reduce compliant crawl traffic and make your licensing or content-use position explicit.
What it cannot accomplish
- It cannot protect confidential files, an API, a staging site, or an employee portal.
- It cannot force deletion of content already fetched or reproduced elsewhere.
- It cannot guarantee that a crawler with a spoofed user agent will be recognized and stopped.
Use HTTP authentication, authorization checks, network ACLs, a firewall, a WAF, or bot-management controls when the consequence of access is material. Keep robots.txt as an access preference, not your only defensive layer.
Which AI crawler identities should a site owner distinguish?
Vendors increasingly publish different user-agent tokens for different purposes. Blocking one token does not necessarily block the others, so choose rules by the outcome you want rather than by the vendor name alone.
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| Token | Documented purpose | Typical policy question |
|---|---|---|
| GPTBot | OpenAI crawler whose fetched content may be used for model training | Do I want to decline training use? |
| OAI-SearchBot | OpenAI crawler used to surface websites in ChatGPT search | Do I want to remain discoverable in ChatGPT search? |
| ChatGPT-User | Handles certain user-initiated requests from ChatGPT | Should individual user requests be allowed to fetch a page? |
| ClaudeBot | Anthropic crawler collecting web content that could contribute to model training | Should Anthropic training collection be disallowed or rate-limited? |
| Google-Extended | Standalone Google token controlling use of Google-crawled content for Gemini training and grounding | Do I want to opt out of Gemini use without changing Google Search? |
These identities are not interchangeable. A rule for GPTBot does not automatically govern OAI-SearchBot, and a Google-Extended rule does not replace your normal Google Search controls. Check each vendor’s current crawler documentation before changing a token, because names and purposes can evolve.
Will blocking GPTBot remove your site from ChatGPT?
No. OpenAI states that the settings for GPTBot, OAI-SearchBot, and ChatGPT-User are independent. You can disallow GPTBot while allowing OAI-SearchBot, preserving the possibility that ChatGPT search will discover and link to your pages.
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Choose the OpenAI outcome you actually want
- Training exclusion with search visibility: disallow GPTBot and allow OAI-SearchBot.
- No automated OpenAI access: disallow each relevant OpenAI token, including OAI-SearchBot and GPTBot; decide separately whether ChatGPT-User requests fit your service.
- User-request access only: allow ChatGPT-User while disallowing training and search tokens, if that matches your legal and operational policy.
OpenAI says a robots.txt change can take about 24 hours to adjust in its systems. During that window, logs may still show requests under the old behavior. A robots rule also does not remove material that was fetched before the change.
Does Google-Extended affect SEO rankings?
Disallowing Google-Extended does not affect inclusion or ranking in Google Search. Google documents Google-Extended as a separate control token for whether Google-crawled content may be used for Gemini training and grounding; it is not a replacement for Googlebot directives, noindex, or access controls.
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Keep the controls separate
- Use ordinary Google Search controls when your goal is indexing, snippets, or ranking behavior.
- Use Google-Extended when your goal is to express a preference about Gemini training or grounding.
- Use authentication or authorization when a page must not be publicly retrievable at all.
Google also warns that robots.txt is not a mechanism for keeping a page out of Google. A URL can still be known through links or other signals even when crawling is disallowed; use noindex where appropriate, and ensure crawlers can access the response carrying that directive.
How do you stop or slow ClaudeBot?
Anthropic’s April 7, 2026 guidance says ClaudeBot honors industry-standard robots.txt directives. To opt out across a site, publish a group for ClaudeBot with Disallow: /. Anthropic also documents Crawl-delay: 1 for rate control.
User-agent: ClaudeBot
Disallow: /
Apply the rule on every host or subdomain that should opt out. A file on www.example.com does not automatically express the same preference for docs.example.com or a separate asset host. Crawl-delay is a request to slow down, not a guaranteed network limit, and support varies among crawlers.
Which robots.txt policy fits your site?
Choose a policy by weighing discoverability, training exclusion, crawl load, licensing posture, and the strength of enforcement you require. There is no universal best setting.
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| Policy | Example directives | Benefits | Trade-offs |
|---|---|---|---|
| Open discovery | Allow documented search and user-request bots; do not disallow training tokens | Maximum potential visibility and broadest crawler access | Less control over training-related collection and crawl volume |
| Selective training opt-out | Disallow GPTBot, ClaudeBot, and Google-Extended; allow OAI-SearchBot | Signals a training preference while preserving ChatGPT search discovery | Depends on voluntary compliance and accurate vendor identities |
| Private-area exclusion | User-agent: * with Disallow: /private/ |
Keeps compliant crawlers away from a named path | Does not secure the directory or prevent direct requests |
| All-bot block | User-agent: * with Disallow: / |
Strongest stated restriction for compliant crawlers | Can reduce search and assistant visibility and still is not technical enforcement |
DataDome’s Global Bot Security Report 2025 illustrates how site policies vary: among 1,529 sampled robots.txt files mentioning GPTBot, 88.88% disallowed it and 11.12% allowed it. Among 918 files mentioning Google-Extended, 91.29% disallowed it and 8.71% allowed it. Those percentages describe that report’s sample, not the entire web.
How do you write and deploy a selective robots.txt policy?
Make the decision before editing syntax. Record which content is public, licensed, paywalled, or confidential; which assistant and search referrals matter; and whether reducing crawl load is worth any lost discovery.
- Inventory hosts and paths. List every production hostname, subdomain, CDN origin, documentation site, and file store. Decide whether each is public, restricted, or private.
- Map vendor tokens to outcomes. Treat training, search, and user-request identities independently. Do not assume a vendor’s brand name represents one crawler.
- Place the file at the correct origin. Serve
/robots.txtfrom the scheme and host you are governing. Redirects, authentication challenges, or a missing file can produce behavior different from your intended policy. - Write narrow groups first. For example, this pattern declines several training-related tokens while allowing OpenAI search crawling:
User-agent: GPTBot
Disallow: /
User-agent: ClaudeBot
Disallow: /
User-agent: Google-Extended
Disallow: /
User-agent: OAI-SearchBot
Allow: /
- Add path-specific restrictions. To express a preference against compliant crawlers on a sensitive path, use:
User-agent: *
Disallow: /private/
- Check group behavior. A specific user-agent group is evaluated for that token; do not rely on a later wildcard group to undo a specific rule. Avoid contradictory allow and disallow lines unless you have tested how your target crawler resolves them.
- Deploy and observe. Confirm the file returns successfully over HTTPS, then inspect server logs and analytics for the exact user-agent strings. OpenAI says its systems may take roughly 24 hours to reflect a change.
- Document the policy. Keep an owner, change date, reason, and affected hosts in your configuration record so a redesign or migration does not silently remove the rule.
How can you protect sensitive material when robots.txt is not enough?
Put a real access decision in front of the data. Require authentication for staff portals, staging environments, customer records, paid downloads, and unpublished APIs; enforce authorization on every request rather than hiding a URL in robots.txt.
Use layered controls
- Authentication: Require a valid session, token, or mutual TLS identity before serving the resource.
- Authorization: Check that the authenticated account is entitled to the specific object, not merely to the host.
- Network controls: Restrict origin access with firewall rules, private networking, or allowlisted ranges where practical.
- WAF and bot management: Rate-limit, challenge, or block traffic based on verified behavior, request volume, and reputation.
- Application controls: Add audit logs, quotas, pagination limits, and anomaly alerts so scraping is visible and containable.
Cloudflare documents a managed robots.txt feature that can emit rules for tokens such as GPTBot, ClaudeBot, Google-Extended, Amazonbot, Applebot-Extended, Bytespider, and CCBot. It separately documents AI Crawl Control for technical blocking of selected AI crawlers. Product names, coverage, and commercial availability can change, so verify the current program and your plan before relying on it.
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What are the common robots.txt mistakes?
- Blocking the wrong token: Disallowing GPTBot does not govern OAI-SearchBot, and Google-Extended is not Googlebot.
- Assuming a wildcard is security: A malicious client can ignore the file or request the origin directly.
- Forgetting subdomains: Rules are host-specific; repeat the policy where the content is actually served.
- Using robots.txt to remove an indexed URL: Use noindex or authenticated responses for removal goals, following the search engine’s requirements.
- Overlooking cached or previously copied content: A new disallow rule controls future compliant fetches, not historical copies.
- Failing to monitor: User-agent strings can be spoofed, and new vendor tokens can appear after your policy is written.
- Creating an accidental visibility blackout: A site-wide wildcard block can reduce referrals from search and assistants even when training exclusion was the only objective.
How should you review and enforce the policy over time?
Set a recurring review whenever you launch a new host, change a licensing position, observe unexpected crawler traffic, or hear that a vendor has introduced a new identity. Compare robots logs with WAF and origin logs; a request claiming to be a permitted bot but arriving with abnormal volume or unverifiable network characteristics deserves investigation.
When a crawler ignores your stated preference, preserve request samples, timestamps, IP information, and affected paths. Then move the restriction to an enforcement layer: challenge or block at the edge, require authentication at the origin, or remove public access to the data. Keep a narrow robots rule as documentation, but do not mistake its presence for proof that access is stopped.
What is the practical recommendation for most site owners?
Start with selective rules rather than an all-bot ban. If assistant search referrals matter, allow the documented search crawler while disallowing training tokens you do not accept. Keep private and regulated material behind authentication and network controls regardless of robots.txt. Finally, test the deployed file, watch logs for at least one vendor refresh cycle, and revisit the policy when crawler identities or your content-licensing terms change.
Frequently Asked Questions
Does blocking GPTBot delete my pages from answers that ChatGPT already generated?
No. A future crawl preference cannot retract text that was previously collected, indexed, quoted, or cached elsewhere. If removal is important, contact the relevant service and remove or restrict the source page itself; robots.txt alone is not a deletion mechanism.
Should I put robots.txt on a staging or test domain?
You may publish a disallow rule as a courtesy, but staging should also require authentication and preferably be unreachable from the public internet. Otherwise a scanner or noncompliant crawler can still fetch it, and links can expose test content.
Can a crawler pretend to be Googlebot or another allowed bot?
Yes. The user-agent header is self-asserted. For high-value content, verify network identity where possible and enforce limits with WAF, firewall, application authentication, and behavioral monitoring instead of trusting the header alone.
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Review it at least when you add a subdomain, publish a new content type, change licensing terms, or detect an unfamiliar bot. A scheduled quarterly check of vendor documentation and access logs helps catch newly introduced tokens before they create an unintended gap.
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