llms.txt checker and generator

llms.txt is a community convention from llmstxt.org, not a standard. A file that passes every check here gains no ranking and no guaranteed AI citation; the convention only proposes a shape for a markdown index that language models can read. The checker validates that shape: one H1 title, an optional blockquote summary, H2 sections with markdown link lists, and it probes up to 20 listed links for reachability. The proxy hands back at most the first 4,096 characters of the response, so a larger file is checked on that prefix and the report says so. The generator parses each line strictly as Title | URL | optional description and reports every line it cannot use.