Worked on the ibm-mas/cli repository to enhance registry configuration safety by developing and integrating Mirror Registry Prefix Validation. This feature enforced RFC 1123 subdomain compliance, ensuring that only valid registry prefixes could be configured during both interactive and non-interactive workflows. The approach relied on Bash and shell scripting, utilizing regular expressions to validate input and prevent misconfiguration. By embedding this validation directly into the configuration and mirroring processes, the work reduced the risk of invalid registry setups and improved deployment reliability. The solution provided clearer user guidance and contributed to safer, more predictable CLI-based registry management for users.