Supported agents

The complete list of AI agents AgentXP detects by default.

AgentXP uses two independent signals to identify AI agent traffic:

Accept: text/markdown header — any client that explicitly requests markdown is treated as an agent, regardless of its User-Agent string.
User-Agent pattern matching — requests whose User-Agent header matches a known bot pattern are detected automatically.

Any client that sends Accept: text/markdown is detected as an agent regardless of its User-Agent string. The table below only covers User-Agent-based detection.

Built-in agents

The following agents are recognized out of the box via User-Agent pattern matching:

Agent name	Organization	Detection pattern
GPTBot	OpenAI	`/GPTBot/i`
ChatGPT-User	OpenAI	`/ChatGPT-User/i`
OAI-SearchBot	OpenAI	`/OAI-SearchBot/i`
ClaudeBot	Anthropic	`/ClaudeBot/i`
Anthropic	Anthropic	`/anthropic-ai/i`
PerplexityBot	Perplexity	`/PerplexityBot/i`
Bytespider	ByteDance	`/Bytespider/i`
Cohere	Cohere	`/cohere-ai/i`
GoogleOther	Google	`/GoogleOther/i`
Google-Extended	Google	`/Google-Extended/i`
Meta-ExternalAgent	Meta	`/Meta-ExternalAgent/i`
Meta-ExternalFetcher	Meta	`/Meta-ExternalFetcher/i`
CCBot	Common Crawl	`/CCBot/i`
Applebot-Extended	Apple	`/Applebot-Extended/i`
Amazonbot	Amazon	`/Amazonbot/i`
AI2Bot	Allen Institute for AI	`/AI2Bot/i`
Diffbot	Diffbot	`/Diffbot/i`
FacebookBot	Meta	`/FacebookBot/i`
YouBot	You.com	`/YouBot/i`
Webzio-Extended	Webz.io	`/Webzio-Extended/i`

Adding custom agents

To detect agents beyond the built-in list, pass a customAgents array to withAgentXP. Each entry requires a name string and a pattern regex.

withAgentXP({
  detection: {
    customAgents: [
      { name: 'MyBot', pattern: /MyBot\/\d+/i }
    ]
  }
})

Custom patterns are checked after the built-in list. The first match wins. For a full walkthrough including per-agent response customization, see the custom agents guide.