execute a class with operator

i can see how a class with operator can be run from a menu selection

but is there a way to run directly inside another class?

i tried to call it by the class name but it does not work

AddTrianRectBH()

and if i call it with the bl_idname
mesh.primitive_TrianRectBH_add

this does not recognise the mesh name as error

so how can you run it ?

Thanks