  Within the Standard Model Effective Field Theory framework, with operators up
to dimension 6, we perform a model-independent analysis of the
lepton-flavour-violating processes involving tau leptons. Namely, we study
hadronic tau decays and $\ell$--$\tau$ conversion in nuclei, with $\ell =
e,\mu$. Based on available experimental limits, we establish constraints on the
Wilson coefficients of the operators contributing to these processes. Our work
paves the way to extract the related information from Belle II and foreseen
future experiments.
