Cursor Composer is the premium feature within Cursor that allows AI to edit multiple files at once with full project context. Request a feature and Composer creates new files, modifies existing ones, updates imports, and maintains consistency across your codebase. The AI understands your project structure, dependencies, and patterns. Features include multi-file refactoring, feature implementation, bug fixing across files, and architectural changes. More powerful than single-file AI assistants. Requires Cursor Pro subscription but transforms how developers work with AI by allowing project-level changes rather than file-by-file editing.