Leafcutters bees are solitary bees, which means each female is fertile and she does all of the chores to raise her young. These solitary female bees can’t gather pollen and nectar, lay eggs, cut and gather leaves, and defend her nesting hole. Instead, she may be shy and wait for you to leave the vicinity of her nesting house or simply fly around you. Leafcutter bees are extremely gentle and allow you to approach their bee house without fear of being stung. Even though leafcutter bees are solitary, they like company because they build their nests near one another. There is no sharing of nests, however. Gregarious (neighborly) bees are perfect for farms where lots of bees are needed to pollinate the fields.
https://mx.yamaha.com/es/education/

Although leafcutter bees have stingers, they will only sting if their life is threatened. More times than not, stings are caused by being caught in clothing and the bee thinks it is being squished. Even if you are unfortunate enough to be stung, the effects are generally no worse than a mosquito bite.