Here is the gold standard. Krishna defines renunciation in the mode of goodness (sāttviko tyāgaḥ). It happens when a person vigorously performs their prescribed duty (niyataṁ kriyate) for one reason only: because it ought to be done (kāryam ity eva). While doing the work, they completely discard two things: psychological attachment to the action itself (saṅgaṁ tyaktvā) and the obsessive craving for the end result or fruit (phalaṁ caiva).