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

> @mount("ft4.is_ auth_ descriptor_ valid")
query is_ auth_ descriptor_ valid(account_ id: byte_ array, auth_ descriptor_ id: byte_ array): boolean Checks if

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.external.accounts/is_auth_descriptor_valid/

QUERY

# is\_auth\_descriptor\_valid

```signature
@mount("ft4.is_auth_descriptor_valid")
query is_auth_descriptor_valid(account_id: byte_array, auth_descriptor_id: byte_array): boolean
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/external/accounts/queries.rell#lines-182)

Checks if the specified auth descriptor is valid for the specified account. By valid,
it is meant that none of the rules of the auth descriptor has been violated yet.

Due to the nature of the available rules, a truthy response of this query should be
considered as valid only at the point of calling the query and might have changed
between the time of calling this query and the time when the auth descriptor is actually
used.

**Parameters**

* **account\_id** — the id of the account to check auth descriptor against
* **auth\_descriptor\_id** — the id of the auth descriptor to check

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