The term "agent" is simply the Console's way of referring to users who can do at least something (view the schema, manage property settings, create and delete user profiles) within the Console. This section of the documentation provides information on managing your agents and agent accounts.
All about agents: users who have administrative rights to
Accessing the Manage Agents Page
How to get where you're
going, at least when it comes
Console Roles and Permissions
What can be done in the Console, and who can do it.
Console Roles and Dashboard Permissions
How Console roles and Dashboard permissions align (hint: they don't).
So what exactly can an Application Configuration Manager do?
Profile Access Filters
Details the three user profile access types that can be assigned to agents.
Limit agents to a specific set
of profiles (e.g., only profiles from the US).
Change the default search attributes shown to one or
Creating an Agent
The create-an-agent process, including information on how
to accept an agent invitation.
Blocking Access for
Temporarily suspend an
agent's access to user
Deleting an Agent
Remove an agent's account and all of his or her permissions.
Filtering for Agents
Filter your list of agents by name or by email address.
Exporting Agent Data
Save information about all
your agents to a comma-separated values file.