Agent is a cancelled action / sandbox style game that was in development in 2003 by Rockstar San Diego / Angel Studios, for the Playstation 2 and Xbox. There are not many info available on the project, as it was never officially announced, but we can assume that it was going to be somehow similar to the GTA series. In the end the game was never finished for unknown reasons, but it’s possible that Rockstar San Diego had to shift resources to finish Red Dead Revolver. Only few screens and a video from an ealry prototype / tech demo are saved in the gallery below, to preserve its existence.
A new project also called Agent is now in development at Rockstar North for the Playstation 3, but we are not sure if the 2 games are somehow related. As we can read in Wikipedia, Agent by Rockstar Nord will be set in the world of the late 1970s and it will “take players on a paranoid journey into the world of counter-intelligence, espionage, and political assassinations”.