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All lessons in AI Search and Answer Engine Optimization Lesson 2.1 of 22

Module 1: Understanding AI Search

  1. 1.1What is AI search?
  2. 1.2Traditional search vs. AI search
  3. 1.3Google AI Overviews, ChatGPT Search, Perplexity, and Microsoft Copilot
  4. 1.4Brand mentions vs. citations in AI answers

Module 2: Technical Accessibility for AI Systems

  1. 2.1AI crawlers and user agents
  2. 2.2Robots.txt and AI crawler access
  3. 2.3Crawling, indexing, and retrieval in AI search
  4. 2.4JavaScript rendering and server-side accessibility
  5. 2.5CDN rules, firewalls, and bot management

Module 3: Creating Content That Can Be Cited

  1. 3.1Writing direct answers to specific questions
  2. 3.2Evidence, original data, and verifiable claims
  3. 3.3Entity clarity and brand recognition
  4. 3.4Content interpretation, context, and ambiguity
  5. 3.5Structured data and its role in AI search

Module 4: Measuring AI Search Visibility

  1. 4.1Measuring brand mentions and source citations
  2. 4.2Identifying AI search referral traffic
  3. 4.3Testing visibility across AI search platforms
  4. 4.4Measurement limitations and reliable reporting

Module 5: Improving AI Search Readiness

  1. 5.1Conducting an AI search readiness audit
  2. 5.2Finding brand, product, and content gaps
  3. 5.3Prioritizing pages for AI search improvement
  4. 5.4Building an AI search monitoring plan

AI crawlers and user agents

Covered here

  • What a user agent is and how to read one
  • The difference between training, search, and user-triggered bots
  • Which AI crawlers affect citations

Short answer

An AI crawler is a bot that visits web pages for an AI company. Each one identifies itself with a user agent name. Some collect training data, like GPTBot and ClaudeBot. Some index pages for AI search, like OAI-SearchBot, Claude-SearchBot, and PerplexityBot. Others fetch a page only when a user asks, like ChatGPT-User. Search and user-triggered bots matter most for citations.

Three jobs, three kinds of bots

AI companies send bots for different purposes. Mixing them up is the most common mistake in AI search setup.

PurposeWhat it doesAffects citations?
TrainingCollects pages to improve future modelsIndirectly, over the long term
Search indexingBuilds the index used to find and cite pagesYes, directly
User-triggeredFetches a page live when a user shares a link or the AI browsesYes, for that answer

Common AI user agents

CompanyTrainingSearchUser-triggered
OpenAIGPTBotOAI-SearchBotChatGPT-User
AnthropicClaudeBotClaude-SearchBotClaude-User
Perplexity(none listed)PerplexityBotPerplexity-User
GoogleGoogle-Extended (robots token only)GooglebotGoogle user-triggered fetchers
Microsoft(uses Bing data)Bingbot(varies)
AppleApplebot-Extended (robots token only)Applebot(varies)

Other bots you may see include CCBot from Common Crawl, whose public dataset is used by many AI projects, and Bytespider from ByteDance. Names change, so confirm against each provider’s official crawler page before you write rules.

Google-Extended is special

Google-Extended is not a separate crawler. It is a robots.txt token that controls whether content Googlebot collects can be used for Gemini model training and grounding in some Google AI products. Blocking it does not remove you from Google Search or AI Overviews, which use regular Googlebot. Blocking Googlebot itself would remove you from everything Google shows.

Seeing AI bots in your server logs

Your hosting control panel or CDN usually shows access logs. Search for names like OAI-SearchBot or PerplexityBot. If you see zero visits over a month while competitors are cited, something may be blocking them.

Example: A Quezon City furniture shop checks its cPanel raw access logs and finds GPTBot visits but no OAI-SearchBot or PerplexityBot. A security plugin was blocking “unknown bots.” Allowing the search bots led to the first Perplexity citation within weeks.

Quick quiz

1. Which bot most directly affects ChatGPT Search citations?
2. What happens if you block Google-Extended?

Your action

Key terms

User agent
The name a bot or browser sends to identify itself.
Training crawler
A bot that collects pages to train AI models.
Search crawler
A bot that indexes pages so an AI tool can cite them.
User-triggered fetcher
A bot that loads a page because a user asked about it.
Robots token
A name used in robots.txt to control a bot or a use of data.

Questions beginners ask

If I block training bots, will I lose citations?

Usually not. Training and search bots are separate for most providers. Check each company's documentation.

Can bots fake a user agent?

Yes. Verify important bots using the IP ranges each provider publishes.

Related lessons

Want someone to audit your AI search visibility while you learn? The team at Remar Digital can help.