design-drift prevents AI agents from drifting away from your design system in real time. Lock any of existing brands design systems and every Write/Edit to a UI file is automatically scanned. Colors, fonts, spacing, and border-radius checked against the brand's actual tokens. Violations surface inline with exact fix hints. No hardcoded data: tokens are extracted dynamically from bundled SKILL.md constraint files and DESIGN.md visual token files, both of which are open-source repositories.