All extracted data, meta-data and codebook for the first phase of the DECOMPOSE project (Disentangling psychological interventions for mental disorders into a taxonomy of active ingredients project ERC-2021-STG-101042701), involving retrieval of detailed intervention description, such as protocols or manuals, for all evidence-based psychological interventions included in netword meta-analyses of trials for the following disorders: schizophrenia and other psychotic, borderline personality disorder, bipolar disorder, substance use disorder, anorexia nervosa and bulimia nervosa. The data support the following publication: Blithikioti, C., Tomei, G., Visconti, F., Gómez-Gómez, I., Cristea, I.A. (under review). Accessibility and public availability of treatment protocols and manuals for evidence-based psychological interventions for severe mental disorders: Meta-research evaluation