This is the 9846th most frequent Polish word.
agentem
"Agentem" is the instrumental singular form of "agent," meaning "agent" or "representative" in English.
Here, 'agentem' is used as the instrumental form of the noun 'agent', denoting that Kowalski performs as an agent.
Pan Kowalski jest najlepszym agentem w naszej firmie.
Mr. Kowalski is the best agent in our company.
In this sentence, 'agentem' is used as the instrumental case referring to a role identified with an agent.
W grze strategicznej wcielałem się w agentem tajnej organizacji.
In the strategy game, I played the role of an agent of a secret organization.
Here, 'agentem' indicates the instrumental case, describing the mode of interaction involving the agent.