How can I figure out the right way "who is the user running the Agent"?

[aditya-scio]

I want to pass in the user context into the action group so that I can personalise the action based on the user.
As per the documentation -- I couldn't find who would be the user running the "agent"?
-- I looked at the traces and I don't have any specific leads as well.

Could someone point me to what i'm missing?