During August 2025, rareboy@naver.com developed and tested a duplicate issue prevention workflow for the planetarium/agent8 repository, focusing on automation and CI/CD improvements using JavaScript, YAML, and GitHub Actions. The workflow automatically detected new issues with duplicate titles and posted warning comments to maintain issue hygiene. After evaluating the impact, rareboy identified unintended side effects and promptly rolled back the workflow to preserve repository stability. This work demonstrated a disciplined approach to rapid prototyping, risk assessment, and rollback within CI/CD pipelines, reflecting a thoughtful balance between innovation and reliability in automation practices over a focused one-month engineering period.