A typical American tech worker's "contract" covers IP assignment and NDA. None of the other stuff is legally binding, and either side is free to change it or walk at any time.
I wonder if this is partly why upper-end salaries get so sky-high when compared to other country's tech sectors. It might be accounting for a level of risk that you could be cut off at any moment, especially in at-will states.
Is that true? The company surely has terms for you, like expected working hours, terms about your sick leave, performance and health terms, out of office expectations, intellectual property disclosures and NDAs? Non-compete clauses? When does all that become binding if not through a contract?