Aqsa Moss3fan developed the SwiftFixIt Diagnostic-Based Code Fix Framework for the swiftlang/swift-package-manager repository, focusing on automated, diagnostics-driven code corrections. Leveraging Swift and advanced skills in AST manipulation and compiler tooling, Aqsa designed a system that deserializes diagnostic information and applies in-place source code modifications. The framework processes diagnostic files to guide automated fix-its, establishing a foundation for future maintenance commands like swift fixit and swift migrate. Comprehensive unit tests were implemented to validate the end-to-end workflow, ensuring reliability and maintainability. This work laid a scalable groundwork for automated code maintenance within the Swift package management ecosystem.