Add it to Claude Design
Claude builds the design system for you from its files.
Add the "OpenCode" design system to my Claude design systems. Its files, already in Claude's Design System format, are in https://github.com/feimacode/open-design-agent-kit/tree/main/claude-design-systems/opencode-ai/project. Build a Design System artifact from them.
Or in Claude's Add design system, pick the GitHub repo option with feimacode/open-design-agent-kit and the folder claude-design-systems/opencode-ai.