agent, a gent

Agent or agent means someone authorized to act on behalf of another person, or in an official capacity --
The real estate agent called; she left a message.
He is studying to be an FBI agent.

Agent may also mean a force or cause, one that produces a specific result, literally or figuratively --
Agent orange was used to defoliate large tracts of land during the Vietnam war.
Gin was the agent of his downfall.

A gent or a gent means one ( a ) well-mannered, civilized male person ( gent, short for gentleman ) --
He is a gent; he's always polite.
He'd never insult anyone; he's a gent, a real gent.

Now that you know that, you can say --
"The agent is a gent and a scholar; he's been very helpful."