You will be provided notice that they are claiming that you breached the stipulation and are seeking a writ of possession on that basis; you will therefore have the opportunity to go to court and dispute their case. You could also file an application for relief, such as by filing what's often known as an "order to show cause" (a request for a court order), either pre-emptively, if you believe they are harassing you or otherwise violating the stipulation, or after a writ is issued.