EU interoperability rules push design systems to expose accessibility metadata

Tech · 5 min read

The European Commission's updated interoperability guidance includes a requirement for component libraries used by public services to expose machine-readable accessibility metadata, including test traces and token provenance. The mandate aims to make cross-agency UI reuse safer and more auditable.

Practically, the rule means design systems must publish not only component code but also associated test artifacts, token history, and a declared accessibility level for each component. The guidance specifies a lightweight JSON schema for metadata to facilitate tooling and discovery.

Design system teams are already adapting, building export pipelines from Figma and Storybook to generate the metadata bundles automatically. Some vendors are offering hosted registries that validate the metadata against the Commission's schema and run scheduled checks.

Experts say the mandate will raise the bar for public-sector UX but warn about the cost burden for smaller municipalities; EU funding streams are being discussed to help consolidate shared canonical component libraries.