소개
This skill empowers Claude to act as a senior userscript engineer, providing precise metadata headers, handling complex DOM mutations via MutationObservers, managing persistent state through GM_* APIs, and ensuring cross-browser compatibility. It is designed for developers who need to automate repetitive web tasks, inject custom functionality into third-party websites, or intercept network requests without the overhead of building full browser extensions. By following standardized patterns and security checklists, it ensures that generated scripts are performant, secure, and easy to maintain across various browser environments.