llms.txt and llms-full.txt Presence.
Plain-text files at the site root that tell AI engines what the site is about, where to find canonical content, and provide a direct content corpus. An emerging standard with rapidly growing adoption.
How to improve llms.txt and llms-full.txt presence
- Create /llms.txt at site root with site description, core URLs, guides, case studies, tools
- Create /llms-full.txt at site root with full-content corpus of cornerstone pages (~50K words)
- Update both files quarterly when new cornerstone content is added
- Link to llms.txt from /ai.txt for additional discoverability
How to measure progress
Verify both files load correctly. Track AI crawler hits on both files in Cloudflare AI Crawl Control.
Common mistakes that erode llms.txt and llms-full.txt presence
- Skipping llms-full.txt because it seems redundant — it's not, AI crawlers ingest it differently
- Letting llms.txt go stale — refresh quarterly
- Including marketing fluff in llms.txt — keep it factual and structural
How CiterLabs handles llms.txt and llms-full.txt presence
CiterLabs serves both files at citerlabs.com and provides a free /tools/llms-txt-generator for any site.
Which AI engines weight this most
This factor most strongly affects citation decisions in:
- Claude (Anthropic) — Second-largest enterprise AI assistant by API usage.
- ChatGPT (OpenAI) — Leading consumer AI assistant by usage, with 700M+ weekly active users as of 2026.
- Perplexity AI (Perplexity) — Fastest-growing AI search engine by volume.
Want CiterLabs to ship llms.txt and llms-full.txt presence for you?
A 60-day GEO Sprint addresses llms.txt and llms-full.txt presence alongside the four other GEO mechanisms. Fixed fee, +20pt citation lift guarantee, full refund if we miss.