N.Y. Civil Practice Law & Rules § 2104: Stipulations

Rule 2104. Stipulations. An agreement between parties or their

attorneys relating to any matter in an action, other than one made

between counsel in open court, is not binding upon a party unless it is

in a writing subscribed by him or his attorney or reduced to the form of

an order and entered. With respect to stipulations of settlement and

notwithstanding the form of the stipulation of settlement, the terms of

such stipulation shall be filed by the defendant with the county clerk.