# AuthDescriptor · FT4 Rell API · Chromia Docs (concept)

> function AuthDescriptor(id: byte_ array): account_ auth_ descriptor Retrieve an account_auth_descriptor given the id Throws '"MISSING AUTH DESCRIPTOR"' if 

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.accounts/-auth-descriptor/

FUNCTION

# AuthDescriptor

```signature
function AuthDescriptor(id: byte_array): account_auth_descriptor
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/accounts/auth_external.rell#lines-8)

Retrieve an `account_auth_descriptor` given the id

Throws '"MISSING AUTH DESCRIPTOR"' if there's no auth descriptor with the given id

**Parameters**

* **id** — the id of the `account_auth_descriptor`

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.accounts/-auth-descriptor.html)Generated API reference, mirrored from the live docs