At the moment, if you do a "devtool add" or a "devtool upgrade", you need to take care of moving the created recipe to a real layer manually; it would be nice to provide a single command (or option to update-recipe) that would do that for you. The tricky thing is when you do "devtool update-recipe" in this situation, your changes are only going into the workspace, whereas when you do it after doing "devtool modify" your changes go back to the "real" recipe that's already in a proper layer; this may be a little confusing if you don't know what's going on behind the scenes. If practical it would be nice to smooth this out; does it make sense to have a two-step process where you use "devtool update-recipe" to update the recipe in the workspace and then another command to copy/move that recipe and associated files to a real layer?
Fixed in oe-core fa550fcb9333d59b28fc0e4aebde888831410f5c.