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, reducing the risk of configuration errors and improving workflow reproducibility. Her work focused on configuration management, ensuring that the tool’s metadata accurately reflected required parameters. Although the contribution was limited to a single bug fix, it demonstrated careful attention to detail and a clear understanding of workflow reliability.