Ditte Jacobs contributed to the nf-core/modules repository by addressing a metadata configuration issue in the GATK4 BaseRecalibrator module. She updated the meta.yml file using YAML to enforce mandatory inputs for known_sites and known_sites_tbi, removing their previous 'optional' status. This change aligned the module’s configuration with the GATK4 tool manual, ensuring that workflows require the correct input files and reducing the risk of configuration errors. Her work focused on configuration management, improving the reliability and reproducibility of BaseRecalibrator workflows. The update enhanced tool usage by lowering runtime failures and supporting more robust pipeline execution within the nf-core/modules ecosystem.