The Belle II experiment is located at the KEK High Energy Accelerator Research Organization in Tsukuba, Japan.
It is designed to perform measurements in all fields of heavy flavour physics, including measurements of rare B decays.
This talk presents the recent progress in the hadronic and semileptonic tagging algorithm, current sensitivity studies
for the future measurement of $B^+ \rightarrow \tau^+ \nu$ at Belle II, and the validation of the newly developed reconstruction tools
on the full dataset recorded by the preceding Belle experiment.