The goal of this clinical trial is to test a disclosure intervention among people in treatment for opioid use disorder. The main question it aims to answer is whether people who receive a disclosure intervention have better treatment- and recovery-related outcomes one year after receiving the intervention. Participants will complete a brief disclosure intervention designed to help them (1) make key disclosures related to disclosure and (2) build skills to disclose. Researchers will compare results to participants in a waitlist comparator condition, who receive the intervention at the end of the study.