AI agents can now generate UI from design systems, but only if those systems are structured for machine consumption. An agent-ready design system requires five elements: machine-readable tokens, documented component APIs, design-to-code parity between Figma and code, usage rules encoded in machine-readable form, and a mechanism to feed context to the agent (MCP server, agents file, or routing). Without these, agents produce drift at scale. A practical six-step path is outlined: export tokens to structured files, achieve Figma-code parity, document component props inline, encode usage rules as automated checks, connect a context method, and assign an owner to prevent drift. Common mistakes include relying on screenshots, assuming shared context, confusing UI kits with design systems, and skipping enforcement.