A shorter, singular-named sibling to llms.txt — the same title-and-summary shape, without the full linked index.
Some generators publish this filename as a fallback in case a crawler looks for the singular form instead of the plural. It costs nothing to add alongside llms.txt.
Not part of the llmstxt.org specification and not documented as something any crawler specifically looks for. Publish it in addition to llms.txt, never as a replacement for it.
Site root: example.com/llm.txt
Fill this in and download llm.txt directly — the same generator lives in the full builder alongside the other 15 files.