(1) Any party, or a party’s legal representative, may file the written agreement or a memorandum summarizing the written agreement with the court having jurisdiction over the estate or trust. However, if a special representative is a party to the written agreement, the agreement or a memorandum of its terms may not be filed within thirty (30) days of the agreement’s execution by all parties unless the written consent of the special representative is filed along with, or included within, the provision of such agreement or memorandum. The agreement or a memorandum of its terms may be filed after a special representative has commenced a proceeding under section 15-8-304, Idaho Code, only after the court has determined that the special representative has adequately represented and protected the parties represented. Failure to complete any action authorized or required under this subsection does not cause the written agreement to be ineffective and the agreement is nonetheless binding and conclusive on all persons interested in the estate or trust.