What is meta-externalfetcher?
meta-externalfetcher is used by Meta to perform user-initiated fetches of individual links from AI assistant product functions. You can set up Agent Analytics to see when meta-externalfetcher visits your website.
Category
| Example User Agent | Mozilla/5.0 (compatible; Meta-ExternalFetcher/1.0; +https://developers.facebook.com/docs/sharing/webmasters/crawler) |
| Operated By | Meta |
| Source | Official Website |
| Identity |
Verified
Verified Identification
Requests claiming to be this agent can be authenticated using its published verification method. |
| Triggered By | User action |
| Used for AI Model Training | Not expected |
| Affects AI Chat & Search Visibility | Yes |
| Expected To Follow Robots.txt | Yes |
Why Is meta-externalfetcher Visiting My Website?
A user asked Meta's assistant a question your page could help answer. meta-externalfetcher retrieved the page to support its response, often with a citation linking back to your site.
Should I Block meta-externalfetcher?
Usually not. Blocking meta-externalfetcher can keep your pages out of AI-generated answers and eliminate potential citation traffic. It does not improve traditional search rankings. For context, 14% of the top websites we track currently have robots.txt rules for meta-externalfetcher.
How Do I Block meta-externalfetcher Using Robots.txt?
Add this rule to your robots.txt file to block meta-externalfetcher from accessing your website, or use Automatic Robots.txt to block all AI assistants at once. You can customize which pages are blocked by swapping out / for a different path.
User-agent: meta-externalfetcher # https://knownagents.com/agents/meta-externalfetcher
Disallow: /Insights for meta-externalfetcher
As of October 30, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the top 1000 websites and their robots.txt files.
Robots.txt Compliance
Country of Origin
Robots.txt Blocked Percentage
Frequently Asked Questions
What Traffic Patterns Should I Expect From meta-externalfetcher?
meta-externalfetcher makes isolated, on-demand requests rather than crawling your site. Traffic follows user demand, ranging from sporadic fetches to steady visits for a popular assistant.
Does meta-externalfetcher Follow Robots.txt Rules?
meta-externalfetcher is expected to follow robots.txt rules, so a disallow rule is the appropriate first step if you want to block it. Automatic Robots.txt can add and maintain that rule, while Agent Analytics lets you verify whether meta-externalfetcher respects it.
Is meta-externalfetcher Used for AI Model Training?
Not ordinarily. meta-externalfetcher is not categorized as an AI training scraper or data provider, so AI model training is not its expected purpose.
Does Blocking meta-externalfetcher Affect AI Search or Citations?
Yes, for requests handled by meta-externalfetcher. Blocking it can prevent the assistant from retrieving your pages for an answer or linking to them, but a separate crawler may control automatic AI search indexing.
Does meta-externalfetcher Access Private Content?
Not ordinarily. meta-externalfetcher fetches pages as an anonymous visitor without a stored login. Content protected by a paywall or login remains out of reach.
How Can I Verify a Request From meta-externalfetcher?
Agent Analytics tracks visits from meta-externalfetcher and every other known AI agent, crawler, and scraper, then authenticates each visit using meta-externalfetcher's published verification method. You can also check your server logs for requests whose user-agent string contains "meta-externalfetcher". Look for a single-page request with no follow-up navigation. A matching log entry alone is not proof because any bot can claim to be meta-externalfetcher.
How Is meta-externalfetcher Different From Other Meta Agents?
Meta operates separate agents for different purposes, so each agent should be evaluated and controlled independently.
- Muse: Muse is a personal AI agent created by Meta that uses a web browser and connected apps to complete multi-step tasks such as filling out forms, booking travel, sending ema…
- FacebookBot: FacebookBot is a web crawler used by Meta to download training data for its AI speech recognition technology.
- meta-externalagent: meta-externalagent crawls web content for training AI models and improving Meta's products by indexing content directly across the internet.
- meta-webindexer: meta-webindexer is Meta's web crawler that browses the internet to improve search results for Meta AI users. It analyzes online content to make Meta AI's responses more r…
- facebook: facebook is a fetcher operated by Meta.