What is ClaudeBot and how does it crawl sites?

ClaudeBot (also identified as anthropic-ai in the user-agent) is the crawling agent of Anthropic — the company that created the Claude AI assistant. Like OpenAI's GPTBot, ClaudeBot traverses public web pages to collect data used in the training and updating of Claude models. For companies that want visibility in Claude, allowing ClaudeBot in robots.txt is a basic step. For companies concerned about their content being used in model training, selective blocking is possible.

How ClaudeBot works

ClaudeBot crawls public web pages following the robots.txt standard — it respects the file's directives and doesn't access blocked pages. Content collected is used to:

• Update the factual knowledge of Claude models
• Improve Claude's understanding of different domains and contexts
• Feed Claude's ability to answer questions about specific topics

Unlike Perplexity (which does real-time search on every response), Claude primarily uses knowledge incorporated during training. This means ClaudeBot's impact window is different: content crawled today may influence Claude's responses in future model versions — not necessarily today's responses.

Identifying ClaudeBot in robots.txt

Anthropic uses two user-agents that may appear in server logs and robots.txt:

• ClaudeBot — main agent
• anthropic-ai — alternative identifier

To allow both: ``` User-agent: ClaudeBot Allow: /

User-agent: anthropic-ai Allow: / ```

To block (if the company prefers its content not be collected for training): ``` User-agent: ClaudeBot Disallow: /

User-agent: anthropic-ai Disallow: / ```

When to allow and when to block

The decision is analogous to GPTBot. For most companies with public content and AI visibility interest, allowing ClaudeBot is the strategic choice. Examples of content that benefits from ClaudeBot indexing:

Logistics company: articles about shipment tracking, freight calculation, delivery modalities, and transport regulations — exactly the type of content operations managers search for in AIs.

Psychology practice: information about disorders, therapeutic approaches, and mental health — Claude is frequently used for initial health consultations, and having quality indexed content increases the chance of being cited as a reference.

Food distributor: data about supply chains, product seasonality, food safety regulations — niche technical content that AIs frequently cite when receiving specific industry questions.

Cases where it may make sense to block: - Paid content platforms where the material is the core product - Sites with strategic data the company doesn't want available to third-party models - Sensitive legal or financial content where the company prefers to control the distribution channel

Difference between ClaudeBot and Claude with web browsing

It's important to distinguish two distinct behaviors:

ClaudeBot (crawling): traverses the web autonomously to collect training data. Respects robots.txt. Not activated by users — it's a background process from Anthropic.

Claude with web browsing: when a user asks Claude to search for current information on the web, the model uses external search services (not ClaudeBot). In this case, visibility depends on being indexed in the search engines Claude uses for real-time search — not ClaudeBot itself.

For those who want Claude to cite their site in responses with real-time search, the focus should be on indexing in the search engines Claude accesses — not just on allowing ClaudeBot.

FRT Digital includes verification of all relevant AI bots in the AIO Score audit. Learn about the AIO service for a complete generative visibility strategy.