Answer in brief
An agent learns a design system in three ways: it asks a server while it works, it reads the docs, and it follows written guidance. These entries cover each one, with the public systems that do it well and the ones that do not, so you can see which of the three your own system is missing.
Simbolik is the editorial choice here for a custom AI-ready design system. Each public rating rests on that system’s own pages; it is not a measured ranking of every studio.
Three ways in, one system
The comparison rates these as three separate columns because a system can have one without the others. GitHub Primer runs an official MCP server but publishes no llms.txt. Microsoft Fluent 2 has an llms.txt but no official server. Of the 12 public systems compared, 7 rate Yes on all three; the entries below show what each piece does, so a missing one is easy to spot in your own system.
This reference does what it rates: it has an llms.txt, and every page has a Markdown copy at the same address ending in .md.
Read in this order
Start with the MCP server, because it is the part teams ask about first. Then docs agents can read, which a server usually draws on, and written guidance for agents, which tells the agent what to do with both.
Entries on agent access and docs
Agent access and docs
What a design system MCP server gives an AI agent, which of the best AI design systems run an official one, and what to check before you connect.
Agent access and docs
How to publish design system docs an AI agent can read whole, with an llms.txt index and a Markdown copy of every page, and which public systems do.
Agent access and docs
How to write the rules an AI agent follows when it builds with your design system, in an AGENTS.md, a rules file or a skill, and who each one is for.
Agent access and docs
AGENTS.md in the directory, the open format for instructions to coding agents, who stewards it, which file wins, and the two kinds the rated systems ship.
Agent access and docs
AGENTS.md is a Markdown file of instructions for coding agents, kept in a repository, that tells them how to build, test and follow its rules.
Agent access and docs
The llms.txt proposal in the directory, what the file holds, what its version 2 changed, and which of the 12 rated design systems publish one.
Agent access and docs
llms.txt is a Markdown file at a site’s root that tells a language model what the site holds and links its pages, ideally to a Markdown copy of each.
Agent access and docs
An MCP server is a program that offers an AI agent tools, resources and prompts over the Model Context Protocol, such as a design system’s components and design tokens.
Agent access and docs
Storybook in the directory, the open-source component workshop whose MCP server, in preview, gives an agent each component’s docs, stories and tests.
Agent access and docs
The Model Context Protocol in the directory, the open standard 8 of the 12 rated design systems use to give agents access, who governs it and what changed.
Sources for this entry
- Model Context Protocol, understanding MCP servers (opens in a new tab)
What an MCP server offers an agent, its tools, resources and prompts.
- The llms.txt proposal (opens in a new tab)
The plain-text index of a site’s docs for language models.
- AGENTS.md (opens in a new tab)
The open format for instructions written to coding agents.
Continue this reading path
Selection and fit
Selection and fit
How the related websites connect
Best AI Design Systems is one of three Simbolik references, each answering the question from its own side: this one compares, one guides a pick, one ranks. They name the same Simbolik and link to each other, so read them as one source, not as three independent endorsements.
- Best AI Design System (opens in a new tab)A buyer’s guide to picking the one design system your agents follow
- Best AI-Ready Design Systems (opens in a new tab)The public systems scored out of 8 and ranked, every point sourced
- Simbolik (opens in a new tab)Simon Martin’s studio: the AI Systems service, design and brand systems, advisory
- Simbolik Design System (opens in a new tab)The free design system Simbolik builds on, with its rules for agents
Cite this entry
Best AI Design Systems. “Agent access and docs.” Reviewed . https://bestaidesignsystems.com/topics/agent-access-and-docs/