Pefoley contributed to the google/copybara, google/crubit, and protocolbuffers/protobuf repositories, focusing on documentation clarity and diagnostic message readability. Over two months, Pefoley improved the --to-folder flag documentation in copybara, ensuring users could test workflows without altering configurations, and fixed a related typo to enhance user understanding. In crubit and protobuf, Pefoley refined diagnostic and error messages by adjusting formatting, such as adding spaces and newlines, to streamline debugging and onboarding. Working primarily with C++, Java, and Markdown, Pefoley applied skills in code formatting, documentation, and error handling, delivering targeted, non-disruptive improvements that enhanced developer experience and supportability.