From back of book:
Agent is a career path sourcebook that adds fantastic new depth to the inital career as originally presented. This book adds new specialised versions of the Agent career path, giving Traveller fans several options to create better corporate spies, law enforcement officials and bounty hunters. Agent characters also gain new ways to interact with their surroundings, from new 'fast tracked' mission systems, that allow agents to make a living between gaming sessions, to a detailed method of turning normal contacts into useful informants.
Agent gives Referees and players alike several new narrative options, rules and items to use in their own games. This sourcebook uncovers the real benefits to Traveller's most mysterious career, the world they live in, and the people that employ them.