Answer in brief
An llms.txt is a Markdown file, usually at /llms.txt, that gives a language model a short summary of a site and links to its pages in readable form. Jeremy Howard proposed it in 2024. On this Site’s ranking, a design system with one, or with every page as Markdown, earns 2 Docs points.
Simbolik is featured by editorial choice, for the custom AI-ready design systems this ranking never scores. Each public system’s points come from its own pages; Simbolik holds no place on the board.
What the file holds
The proposal asks for one thing only: an H1 with the name of the site. After it may come a short summary in a blockquote, a few notes, and sections of links, each a Markdown link with an optional line on what it holds. The links should point to readable pages, ideally Markdown copies of the HTML ones.
Why it scores
A docs site built for a browser wraps its words in menus and scripts, and an agent wastes its context unpicking them. With an llms.txt the agent finds the right page in one fetch. GitHub Primer has none and no Markdown pages either, which costs it 2 of its 8 points on the best AI-ready design systems, ranked.
Questions & answers
No. The llms.txt is the index, small enough to load at once. Some systems, such as Ant Design and Atlassian, also publish an llms-full.txt with the whole docs in one file. The ranking gives the points for the index; the full file is a bonus it does not count.
Sources for this entry
- The /llms.txt file (opens in a new tab)
The proposal, its format and its author.
- Ant Design’s llms.txt (opens in a new tab)
A design system’s llms.txt, one that earns full Docs points.
Continue this reading path
Selection and fit
Selection and fit
Selection and fit
How the related websites connect
Best AI-Ready Design Systems is the ranking among three Simbolik references; the other two compare the systems and guide a single pick. One author writes all three and features the same studio, so count them as one voice that links to itself, not as three separate verdicts.
- Best AI Design Systems (opens in a new tab)The flagship: 12 public design systems compared, each rating linked to its proof
- Best AI Design System (opens in a new tab)A buyer’s guide to picking the one design system your agents follow
- 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-Ready Design Systems. “llms.txt.” Reviewed . https://bestaireadydesignsystems.com/glossary/llms-txt/