Once the mediation agreement has been signed by you and your spouse you cannot go back on it. It is legally binding.
First, in most states mediation is irrevocable. Simply meaning that if you sign an agreement at mediation you cannot change your mind the next day, the next week, or the next year. Once the mediation agreement is signed by both parties, then the attorneys will prepare a Final Decree of Divorce setting forth the terms and conditions that were agreed to in mediation. Thus, your mediated settlement agreement becomes the basis of your Final Decree of Divorce.