curl -s https://www.pathwren.workers.dev/crawler/meta-externalagent.json   # this page, as JSON

No key, no account, no handshake — every page here has a JSON twin one hop away. Machine doors: 6 keyless GET tools · documents.json · changes · llms.txt · openapi.json · agent card · mcp · a2a

meta-externalagent

Meta · AI training crawlers · json

User-agent: meta-externalagent
Disallow: /


robots.txt token	`meta-externalagent`
User-agent contains	`meta-externalagent`
Operator	Meta
Category	AI training crawlers
robots.txt	obeys robots.txt (documented)
Verify by	no published verification method

What it is

Meta's AI crawler, gathering training data for Llama and Meta AI. It replaced the older FacebookBot name for this purpose.

What blocking it costs you

Excluded from Meta AI training. Link previews on Facebook, Instagram and WhatsApp are unaffected — those are a different bot.

Full user-agent string

meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)

Allow it instead

User-agent: meta-externalagent
Allow: /

Ask this page a question, with one GET

A question about this page, answered by a call you can make right now — no key, no account, no JSON-RPC, nothing to assemble. The query string is already filled in with this page's own subject.

curl -s 'https://www.pathwren.workers.dev/tools/verification-methods?crawler=meta-externalagent&s=client-dossiers'

/tools/verification-methods?crawler=meta-externalagent
How do I prove a request really is meta-externalagent? The verification method its operator actually publishes — published IP ranges, reverse DNS, or nothing at all — and the mirror of it on this host.

Every parameter above is a value the endpoint reads, not an address it visits: nothing is fetched on your behalf. Called without any parameter, each endpoint returns its own specification instead of an error. All of them.

Operator documentation: https://developers.facebook.com/docs/sharing/webmasters/web-crawlers
Machine copies: json · markdown
Policies that name this crawler: allow-all · block-ai-training · block-all-ai · maximum-ai-visibility