Returns the schema for every report type visible to the calling client whose columns are known ahead of a run. Each entry pairs a report_type_id with the ordered columns that report type produces. Report types that do not support a schema are omitted from the list. Each entry echoes the context_parameters it was resolved against, always the report type's own defaults - post parameter values to a single report type's schema to resolve it against your own context. Use this to discover output shapes across report types in one call instead of requesting each schema by id.