Part of the magic of asdf is that it reads a `.tool-versions` file from anywhere above your current directory and applies the correct version of each tool based on the listed value. (You can also configure a global default version for each tool in case your directory tree doesn't have a .tool-versions file with an entry for the tool you want to use.)

Does Nix allow for a similar workflow? It's really nice to be able to move between projects and automatically have the correct tool versions configured without having to run any special command.