The spy is one of the more unique class in the game of team fortress 2. On default he is armed with a knife, a invisibility watch, a disguise kit, and a sapper. Once you combine all for of his items he can become very deadly and if played right help the team win. Below I listed the names of the default items and their basic functionalities. Knife
: The knife is the Spy's most deadly weapon and is guaranteed to be a one hit kill if stabbed from the back. The spy must get close to the adversary and stab him in the back in order to automatically kill him. The knife can also be used to attack from the side or the front but isn't as deadly and is not the best choice to pick.Sapper
: The sapper is used mostly as a support weapon and can disrupt buildings created by engineers. It can be used when under disguise and when used it will render the building unusable until the Engineer removes the sapper. If the sapper is not removed within a limited amount of time the building will be destroyed and the Spy will gain a point.Invisibility watch
: The invisibility watch is used to cloak the spy if he wants to sneak in behind enemy lines. There is always a timer on the watch that shows how much cloak the spy has left. If he runs out he will become uncloaked. While a spy is clocked he will not be able to attack or sap until the clock either ends or the Spy manually uncloaks himself.Disguise kit
: The disguise kit is used by the Spy to disguise himself as one of the enemy players. When looked at from a friendly player there is a mask on the spy with a picture of the class he is disguised as. If the spy comes into physical contact with the enemy team they will be blocked instead of walking through teammates and therefore realize that you are a Spy.Revolver/Pistol
: This weapon is the spy's only ranged weapon and can be very effective if used properly. It is one of the harder weapons to use and can potentially deal a lot of damage. For some users it may be used as a last resort weapon but if used correctly it can deal crits with headshots and therefore kill the enemy.