GOV.UK Design System

GOV.UK scores 1 of 8 and takes twelfth place. The ratings come from the Government Digital Service’s own site, repositories and npm package, and it has no tie to Simbolik. Every No here was shown by a 404 or an empty listing on November 8, 2026; a negative cannot be proved past that, so a new announcement would change it.

The first 4 signs make the score out of 8: 2 points for a Yes, 1 for a Partly, none for a No. Typed props are rated beside them and left out of the score.

• Design tokens: Partly, 1 point. govuk-frontend 6.6.0 publishes its values as Sass settings and CSS. The only JSON in the package is component fixtures, the macro options and an asset manifest. Proof: govuk-frontend in the npm registry (opens in a new tab), checked November 8, 2026.
• Agent access: No, 0 points. No official MCP server was found on the site, in the alphagov organization or on npm. A community server exists and calls itself unofficial. Proof: govuk-frontend-mcp on GitHub (opens in a new tab), checked November 8, 2026.
• Docs: No, 0 points. https://design-system.service.gov.uk/llms.txt answered 404, as did llms-full.txt and the Markdown versions of pages. The Markdown source sits on GitHub, but it is not published for agents. Proof: the research’s request to that address, checked November 8, 2026.
• Guidance: No, 0 points. Neither repository has an AGENTS.md, CLAUDE.md or rules file at its root, and the site has no section on AI agents. Proof: govuk-frontend on GitHub (opens in a new tab), checked November 8, 2026.
• Typed props: Partly, not scored. Each component has a documented options table for its Nunjucks macro, with a name, type and description, and the package ships macro-options.json. There are no TypeScript types. Proof: the button’s Nunjucks options (opens in a new tab), checked November 8, 2026.

Teams building UK government services that need accessible pages rendered on the server. An agent can still use it by reading the HTML and Nunjucks examples, as long as a person tells it what the system will not.

• Its audience. It is made for UK government services, and its look says so.
• Licenses. The code is MIT; the written content is under the OGL, the UK government’s open license for its content, which was not checked in detail.
• No help for agents. Plan to write every rule and every pointer yourself.

Most of the 7 missing points can be narrowed on your side, in this order: an AGENTS.md that points agents at the Nunjucks options tables and the accessibility rules, a JSON file of the Sass settings your service uses, and a local copy of the Markdown source for the components you rely on. A server is the last and largest step, and the community one is unofficial, so weigh who keeps it running. How to raise your design system’s score sets out that order, and the best AI-ready design systems, ranked show what each step is worth.