Teaching AI agents your design system: Building a component contract with Google’s OKF

A versioned design-system contract can help coding agents avoid outdated React imports, deprecated components, and invalid props by providing an explicit source of truth for a specific library release. The tutorial demonstrates generating an Open Knowledge Format bundle for Primer React 38.40.1, with one Markdown-and-YAML concept file per component, resolved against TypeScript declarations to correct metadata inconsistencies and distinguish similarly named exports. The bundle includes generated API details, deprecation replacements, indexes for selective retrieval, and separately maintained team guides for decisions package metadata cannot provide. A short pointer in CLAUDE.md or AGENTS.md directs agents to open only relevant files, avoiding the large startup context of a single flat reference file. CI can combine TypeScript diagnostics with custom checks for deprecated imports and props, while regeneration and Git-status checks help ensure the contract remains synchronized with package updates. In a limited benchmark of five targeted UI tasks, the OKF bundle matched or exceeded the flat file’s first-attempt correctness while substantially reducing estimated cost, though it took somewhat longer and required more agent turns. The results suggest that selectively retrieved, maintainable documentation can be useful for larger or organization-specific APIs, but they do not prove that OKF itself is superior to all alternatives, and teams should measure tradeoffs such as maintenance effort, retrieval time, model behavior, and documentation scale in their own workflows.

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