Worked on the zio/zio repository to enhance developer onboarding and productivity by updating the testing documentation. Focused on clarifying the use of sbt testOnly and providing detailed Markdown examples for running tests tagged as slow, the work aimed to reduce confusion and streamline local development workflows. The documentation improvements addressed common pain points around targeted test execution, aligning local practices with continuous integration expectations. By leveraging skills in documentation and Markdown, the update enabled contributors to run specific or slow-tagged tests more efficiently, ultimately supporting faster iteration cycles and clearer guidance for both new and existing developers working with zio/zio.