Why robots.txt Is Crucial for AI
Your robots.txt is the first file that an AI crawler checks on your website. If there is a Disallow: / for GPTBot, ChatGPT cannot crawl your website – your content will then not be considered for recommendations and answers.
The problem: Many websites block AI crawlers without knowing it. Some hosting providers set blanket blocks, some CMS updates add new rules, and some SEO plugins block "unknown" bots by default. The result: your brand simply does not exist for AI assistants.
All 13 AI crawlers at a glance
There are now about a dozen AI crawlers that scan websites. Each belongs to a different provider and has different purposes:
| Crawler | Provider | Purpose | Recommendation |
|---|---|---|---|
| GPTBot | OpenAI | Training + browsing | Allow |
| ChatGPT-User | OpenAI | Live browsing in chat | Allow |
| Google-Extended | Gemini training | Allow | |
| Googlebot | Suche + AI Overviews | Essentiell | |
| anthropic-ai | Anthropic | Claude training | Allow |
| ClaudeBot | Anthropic | Claude browsing | Allow |
| PerplexityBot | Perplexity | Real-time search | Allow |
| Applebot-Extended | Apple | Apple Intelligence | Allow |
| Meta-ExternalAgent | Meta | Meta AI Training | Consider |
| Bytespider | ByteDance | TikTok AI | Consider |
| CCBot | Common Crawl | Open Archive | Consider |
| cohere-ai | Cohere | Enterprise AI | Allow |
| Amazonbot | Amazon | Alexa + Shopping | Allow |
Block or Allow? Decision Guide
Approach 1: Allow All (recommended for Shops)
If you want AI assistants to recommend your products, allow all crawlers. The best approach for online stores and service providers. Every blocked crawler is an AI system that doesn't know your brand.
Approach 2: Selective Access
Allow the most important crawlers (GPTBot, ClaudeBot, PerplexityBot, Googlebot) and block what you don't need – useful if you have server load concerns.
Approach 3: Block Training, Allow Browsing
Allow live browsing (ChatGPT-User, PerplexityBot), block training crawlers (GPTBot, Google-Extended). This way you're visible in real-time answers without your content being used for model training.
Praxis: robots.txt correctly konfigurieren
Allow all AI crawlers (default)
Block Training, Allow Browsing
5 Common Mistakes in AI Configuration
1. Wildcard blocks everything
User-agent: * / Disallow: / blocks all bots – including AI crawlers. This setup was standard at some hosting providers and is now fatal for AI visibility.
2. Veraltete robots.txt after CMS-Update
Some CMS updates overwrite the robots.txt or add new rules. Check after every update whether your AI crawler rules are intact.
3. Case sensitivity in User-Agent
User-Agent names are case-sensitive. GPTBot is not the same as gptbot. Always use the official spelling.
4. No robots.txt present
No robots.txt is better than a poorly configured one – without the file all crawlers are allowed. But you miss the chance to protect internal areas.
5. CDN/Firewall blocked Bots
Cloudflare, Sucuri and other WAFs can block AI bots at server level before the robots.txt is read. Check the bot management settings.
How to check your robots.txt now
Instead of manually reading the robots.txt and checking 13 crawlers one by one, use our free tool:
robots.txt AI-Crawler Check
Checks in seconds which of the 13 AI crawlers can crawl your website – with visual status display and concrete recommendations.
Free check now →No registration required · results in seconds
Zusammenspiel: robots.txt + llms.txt
robots.txt and llms.txt work together: robots.txt controls access – who can crawl? llms.txt provides the content – what should AI know about you? Without allowed access, the best llms.txt is useless.
The optimal 5-step workflow:
- robots.txt check – Allow AI crawlers (→ Checker)
- AI visibility messen – Wo stehen Sie? (→ Visibility Check)
- Schema.org check – Structured data completely? (→ Schema Checker)
- Generate llms.txt – create AI-optimized files (→ Generator)
- Validieren – Sind all files korrekt? (→ Validator)