SAN FRANCISCO — The California Supreme Court came down in support of employer arbitration agreements as expected Monday, but it left open a door for plaintiffs attorneys looking to keep their claims in court.

The opinion largely favored defendants seeking to use arbitration agreements to keep disputes with their employees from turning into class proceedings. There was a silver lining for plaintiffs attorneys, however, as the court ruled that the right to initiate state Labor Code actions under the Private Attorney Generals Act can’t be waived.