# Meta-ExternalFetcher

AI agent · Assistants fetching for a user · Acts for a person · operated by meta

**Identity:** Signs its requests (Web Bot Auth).

## How to recognise it

- Signed requests: `Signature-Agent` from `www.meta.com`, keys at `https://www.meta.com/.well-known/http-message-signatures-directory`
- User agent contains `meta-externalfetcher`

## With Double Agent

Sessions from Meta-ExternalFetcher are labelled `agent` with `agent_id: meta.externalfetcher`, and tagged in your analytics. Nothing is blocked unless you choose to. Install: https://doubleagent.so/install.md

Source: https://developers.facebook.com/docs/sharing/webmasters/web-crawlers · Operator docs: https://developers.facebook.com/docs/sharing/webmasters/web-crawlers