Gage contributed to the swiftlang/swift-package-manager repository by enhancing the package edit workflow to support unsafe flags in edited packages. He updated the unsafeAllowedPackages logic to recognize .edited packages alongside .fileSystem, enabling developers to use unsafe flags safely during package editing. This change was implemented in Swift, leveraging skills in package management and software development. To ensure reliability and prevent regressions, Gage added a dedicated regression test, testUnsafeFlagsInEditedPackage, which verifies the new behavior. The work addressed a specific gap in the package manager’s functionality, improving both developer productivity and safety when working with SwiftPM and edited package configurations.