Worked on stabilizing test workflows in the scylladb/scylla-cluster-tests repository by addressing a persistent file permission issue that affected artifact downloads under strict umask settings. Delivered a targeted bug fix in Python, applying robust permission handling within shell scripting contexts to ensure downloaded files default to 644 permissions. This change eliminated permission-denied errors during extraction steps, particularly for the scylla user, and reduced the need for manual intervention in CI environments. The update improved the reliability of cluster test executions by lowering test flakiness and streamlining automated workflows, demonstrating a focused approach to bug fixing and file system management.