Free tools
llms.txt checker
Looks for /llms.txt and /llms-full.txt and checks the structure the convention asks for: one H1 title, a short summary, and sections of links. A common failure is a site answering 200 with its HTML 404 page — that's reported separately.
These run against the live URL from my server. Nothing you enter is stored or logged beyond the request itself.
Want the fixes, not just the findings?
The checks tell you what's there. Working out what to do about it is the consulting.