core + attic (Attic Area): these terms have been either deprecated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

agent

Canonical URL: http://schema.org/agent

Thing > Property > agent

The direct performer or driver of the action (animate or inanimate). e.g. John wrote a book.

Usage: Between 100 and 1000 domains
Values expected to be one of these types
Organization
Person
Used on these types
Action

Schema Version 3.4