The Foot object represents a rigged three-bone foot. The foot rig is created from a collection of six or more guide objects: Middle Pivot; Right Pivot; Left Pivot; and at least 3 objects running from the start of the foot to the end of the toe (this means the foot must be at least a two bone chain). Extra items are added onto the length of the foot.
The rig created by MakeFoot contains a foot control and roll control. It can optionally create a distribution control, typically used for the dog leg IK distribution. This IK distribution control is created by default by MakeDogLeg.
See CDK Object Reference for complete list of objects available in the Character Development Kit.