swiftlang/swift-package-manager ? reverse-engineered prompt

Build me a Swift command line tool for managing Swift packages, like a polished package manager for Swift projects. I want it to help people create packages, add and update dependencies from GitHub, resolve versions, build and test code, and show clear help when someone runs it from the terminal. It should work well on macOS and Linux, and feel reliable for both personal projects and team use. Please make the basic commands easy to understand, with good error messages and sensible defaults. If you need to check the latest Swift package manager docs online while you work, go for it. I care most that it feels like a real tool someone could use right away to organize Swift code, reuse other packages, and build their project without a lot of fuss.