Guillermo Sanz López worked on the 6G-Library repository, focusing on standardizing component metadata to improve documentation and onboarding. He introduced new metadata fields such as depends_on and tags by updating public.yaml and README.md files across multiple components, enhancing the mapping of dependencies and overall discoverability. His approach included refining README templates and documentation practices, making it easier for new contributors to understand and use the library. Guillermo applied his skills in configuration management and documentation, utilizing Markdown and YAML to implement these changes. The work addressed the need for clearer component descriptions and more organized project information, though limited in scope.