Agent
An agent is someone who helps cheaters, for example by partnering with them or luring another player into a crooked game.
The simple explanation
An agent, in the language of cheating, is someone who helps a cheater. He may partner with other players in a cheating scheme, work with dealers or casino staff, or bring a victim into a crooked game where he will be cheated. Agents are part of the machinery of a scam.
A closer look
The word is generic, covering several roles. It differs from an alone player, who cheats without help, and from collusion, in which several players share the benefit of cheating. Agents often make the scheme possible: they find the victim, set up the game or pass information. If you are invited to a private game by a stranger and something seems wrong, it is wise to walk away.
A practical example
A man invites a visitor to a private game where the other players are cheating together. He is acting as an agent for the cheats.
Full explanation
An agent is someone who helps cheaters, for example by partnering with them or luring another player into a crooked game.
An agent is a generic term referring to someone colluding with one or more cheaters. He might partner with other players in a cheating scheme or with dealers and employees.
An agent can also be the person who lures another player into a crooked game in which that player will be cheated.
The role is often to bring in the victim or to supply information, rather than to cheat openly himself.
Games in reputable casinos and poker rooms are monitored, which makes such schemes harder.