Worked on stabilizing data processing workflows in the galaxyproject/galaxy repository by addressing a critical bug in the SplitPairedAndUnpairedTool. Focused on backend development using Python, the solution involved replacing a history_content_type-based routing check with a more robust sub-collection element-count inspection, ensuring that unpaired and singleton datasets are handled without causing IndexError crashes. The approach improved reliability for end-user workflows by unwrapping singletons in the unpaired handler and validating the fix against a tracked issue for long-term maintainability. Enhanced code readability and maintainability through clearer branching logic and inline documentation, contributing to a more stable and maintainable backend system.