Multimodality Adaptive Intervention for Post-Inpatient Hospitalization Suicide Risk Reduction

The goal of this clinical trial is to learn whether a combination of brief digital and clinician-delivered interventions can help adults leaving a psychiatric hospitalization cope with suicidal thoughts and prevent suicide-related events. The main questions it aims to answer are: * Are people who receive automated smartphone messages when they report suicidal thoughts after leaving the hospital less likely to have a suicide-related event than those who do smartphone self-monitoring alone? * Are people who have additional session(s) with a clinician in the four weeks after leaving the hospital less likely to have a suicide-related event than those who receive additional brief self-guided intervention(s)? Participants will be asked to: * Make a personalized safety plan (of coping strategies to use when feeling suicidal) before leaving the hospital * Do self-monitoring of suicidal thoughts and related experiences on their smartphone for four weeks after leaving the hospital * Complete a longer set of research questionnaires at the start of the study and five more times during the 12 weeks after leaving the hospital Depending on which study group they are in and whether they benefit from initial smartphone interventions, participants may or may not: * Receive automated smartphone messages reminding them of coping strategies to use for suicidal thoughts * Receive up to three additional sessions with a study clinician * Receive up to three brief online self-guided interventions The study interventions last for the four weeks after leaving the hospital. Participants will also be asked permission to share information from their health records about care received for 12 weeks after leaving the hospital.

Inclusion Criteria: * Adult status (18+ years-old) * Ownership of a smartphone (iOS or Android) * Inpatient admission due to suicidal thoughts or suicide attempt Exclusion Criteria: \- Presence of any factor that impairs an individual's ability to comprehend and effectively participate in the study, including an inability to speak or write English fluently, the presence of gross cognitive impairment due to florid psychosis, intellectual disability, dementia, acute intoxication, or the presence of extremely agitated or violent behavior