hashicorp/vagrant ? reverse-engineered prompt

Build me a command line tool for creating and managing portable development environments.

I want to be able to initialize a project with a simple config file, bring a machine up, shut it down, and destroy it when I am done. It should support running locally with common virtual machine providers, and it should be easy to swap between providers like VirtualBox, VMware, Docker, or cloud based setups without changing the whole workflow.

The experience should feel like a real developer tool, so include clear commands, helpful output, and automatic downloading of a base environment when needed. Make it work on Windows, Mac, and Linux if possible, and keep the setup simple enough that someone can run a quick start command and get a working dev machine. If you need to check current docs or behavior, look them up online first.