The tradition of the Cabinet arose out of the debates at the 1787 Constitutional Convention regarding whether the president would exercise executive authority singly or collaboratively with a cabinet of ministers or a privy council. As a result of the debates, the Constitution vests “all executive power” in the president singly, and authorizes—but does not compel—the president to “require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices”. The Constitution does not specify what the executive departments will be, how many there will be, or what their duties should be.
then The first President of San Andreas, organized his principal officers into a Cabinet, and it has been part of the executive branch structure ever since. Cabinet consisted of five members: himself, Secretary of State, Secretary of the defense, Director of National intelligence and Attorney General. Vice President was not included in Cabinet because the position was initially regarded as a legislative officer (President of the Senate).It was not until the 20th century that Vice Presidents were regularly included as members of the Cabinet and came to be regarded primarily as a member of the executive branch.
Presidents have used Cabinet meetings of selected principal officers but to widely differing extents and for different purposes. Secretary of State advocated use of a parliamentary-style Cabinet government. In recent administrations, Cabinets have grown to include key staff in addition to department and various agency heads. President rick neil formed seven subcabinet councils to review many policy issues, and subsequent Presidents have followed that practice.