Developed a new dataset introspection feature for the zarr-developers/VirtualiZarr repository, introducing the nrefs() method to count total virtual chunk references within datasets. Focused on enhancing API quality and reliability, the work included expanding test coverage with targeted unit tests and updating both API documentation and release notes to support the new functionality. Leveraged Python for API development and data processing, while also applying automated formatting and test fixture improvements to streamline maintenance. The approach emphasized maintainability and reduced downstream debugging, ensuring that users and contributors benefit from clearer documentation and more robust, well-tested code in the project.