In California the rate conversation is a technical conversation
Most staffing sales training treats the rate discussion as a negotiation about value. In California it is at least partly a calculation, because the state calculates overtime on the length of the working day as well as the working week, and because worksite patterns that generate meal and rest premiums are common in exactly the sectors that use the most contingent labour.
The practical consequence is that an agency quoting on a weekly overtime assumption for a site running extended shifts has already lost money before the first timesheet arrives. Recording the shift pattern, the overtime assumption and any premium exposure on the job order turns that from an unpleasant surprise into a priced-in number the account manager can explain.
The client usually is not trying to catch you out
Operations managers rarely think about how a shift pattern interacts with a rate. They think about coverage. An agency that raises the question during intake looks like a supplier who understands the site, which is a better position to negotiate from than the one you occupy after an invoice dispute.