IBM Carbon

Carbon scores 8 of 8 and shares first place with Atlassian, Adobe Spectrum 2 and Ant Design. It is rated from outside, from IBM’s own pages, like the other 11, and it has no tie to Simbolik. It sits under Tokens and data here because its theme files show the W3C format at work in a public system, from the schema line down to each value.

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: Yes, 2 points. The @carbon/themes package ships each theme as a .tokens.json file whose $schema names the format’s 2025.10 version, with every value written as $value and $type. Proof: the white theme’s design tokens (opens in a new tab), checked November 8, 2026.
• Agent access: Yes, 2 points. IBM hosts an official MCP server at mcp.carbondesignsystem.com, and each user signs in with an IBMid. Proof: Carbon MCP, onboarding and setup (opens in a new tab), checked November 8, 2026.
• Docs: Yes, 2 points. An official llms.txt lists the docs, though most of its links lead to HTML pages, not Markdown, and there is no llms-full.txt. Proof: Carbon’s llms.txt (opens in a new tab), checked November 8, 2026.
• Guidance: Yes, 2 points. The same setup section installs the carbon-builder skill and a set of Cursor rules. The AGENTS.md in Carbon’s main repository is for its own contributors, so it is not what earns the points. Proof: Carbon MCP, onboarding and setup (opens in a new tab), checked November 8, 2026.
• Typed props: Yes, not scored. @carbon/react 1.120.0 ships its type declarations, and each component page documents its props. Proof: @carbon/react on npm (opens in a new tab), checked November 8, 2026.

Enterprise teams that want the fullest official agent kit on the board: design tokens in the open format, a hosted server, an index for language models and written rules, all from one maker. It fits internal tools and products that can look like IBM, and teams whose people can each get an IBMid.

• The sign-in. The hosted server needs an IBMid for every person who connects an agent. Check that before you plan a workflow around it.
• The terms. The packages and the skill are under Apache-2.0, but the hosted server runs under its own terms of use. Read them as you would any outside service.
• The links in the llms.txt. They point mostly at HTML pages, so an agent still unpicks menus and scripts on each one. Test a few pages your screens need.
• The status. On November 8, 2026 the setup page did not say whether the server is in preview, and the tool list was read, not run.

Carbon has no gap on the ranking, so readiness here is about fit, not points. An agent can load all of it, and the output will look like IBM. A product that should look like itself needs its own design tokens and its own rules, which is the custom row on the best AI-ready design systems, ranked. To see what that costs, read the cost and scope of making a design system AI-ready.