Was Tirpitz a fleet in being or a surface-raider threat?

Should Tirpitz be understood as a fleet in being rather than as a surface raider?

The two roles overlapped: British forces concentrated to prevent a breakout precisely because Tirpitz could then threaten shipping as a surface raider.

A comment distinguishes roaming surface raiders, which disperse an opponent's forces, from a fleet in being, which draws them toward a force held in port. Tirpitz combined aspects of both in the reply's interpretation. British forces concentrated to prevent a breakout because the ship could then attack shipping as a surface raider. The threat did not depend on a German fleet seeking a conventional fleet action. German capital ships had generally operated piecemeal, limiting the comparison with a battle fleet such as the High Seas Fleet.