From their README

install the 1Password CLI and turn on “Biometric Unlock for 1Password CLI” under the Developer tab of the 1Password preferences. Do this even if your Mac does not support Touch ID.

1Password preferences

Use the Search Keyword (default: 1p) to interact with your 1Password items. Set the actions for each ↩ modifier in the User Configuration.

Alfred search for 1p

Uncommon but useful actions, such as toggling vaults, can be accessed via :1pextras.

Alfred search for :1pextras

Results for managing vaults

To report a problem, run !1pdiagnostic.

⤓ Download Workflow

On Alfred 4 use alternative link