Worked on the bazelbuild/bazel repository to deliver a feature that enables automatic checkout of a repository’s default branch when using git_repository and new_git_repository rules, streamlining repository management for Bazel users. This update removes the need to specify a branch, tag, or revision, preventing incorrect assumptions such as defaulting to 'master' and reducing configuration errors in generated targets. The implementation involved Java and Shell scripting, leveraging version control best practices to improve reliability and usability of repository fetch operations. By addressing issues #27610 and #27611, the work accelerated onboarding and enhanced correctness in Bazel’s external dependency handling workflows.