A job offer is an agreement for $x compensation for x hours worked. A contract specifies what that work is and is not. If it's not in the contract and I don't

A job offer is an agreement for $x compensation for x hours worked. A contract specifies what that work is and is not. If it's not in the contract and I don't do it, well that sucks, for my employer. Without a contract I could be fired for cause.