Someone or something that can act, such as a person, a team or a service, as in IAM.

%WardrikCore.Principal{id: "user:maria", attributes: %{org: "acme", team: "finance"}}

Principals come from three places:

• The agent's own, given to WardrikCore.start_agent/2 as :principal.
• A message's sender, given to WardrikCore.ask/3. The turn that answers acts for them.
• Whoever resumes a parked turn.

Core passes principals on but never reads their attributes. Those are yours, like IAM tags. Packages decide by them, such as a vault that keys secrets by id.