In January 2026, Sebastian Müller enhanced module resolution diagnostics for the astral-sh/ruff repository by updating the output to display the full final search path, replacing the previous truncated format. Using Rust and leveraging strong debugging and testing skills, he improved the diagnosability of unresolved imports by ensuring that developers can now see the actual paths considered during module resolution, with all paths available in verbose mode. The implementation included a clear test plan, validation through cargo test extended, and manual verification on the relevant configuration. This targeted feature addressed a specific usability issue, resulting in more transparent and efficient debugging workflows.