Worked on the facebook/buck2-prelude repository to enhance error reporting for circular dependencies within build systems. Focused on improving the clarity and actionability of diagnostics by capturing specific dependency details when cycles were detected in the dependency graph. Utilized Python to update the post_order_traversal logic, enabling it to provide detailed explanations that identify both the source and target of problematic dependencies. This approach streamlined debugging by surfacing precise cycle information, reducing the time required to resolve build failures. The work demonstrated depth in dependency management and error handling, contributing to more stable and maintainable builds for Buck2 prelude users.