Glossary
Website and AI Search Glossary
Each entry starts with a short answer, then notes how Moonlit Tools uses the term where it applies.
Moon Score#
The Moon Score is Moonlit Tools' overall 0 to 100 number for a website. It combines the six Website Health areas (Site Health, Search, Content, Accessibility, Performance, and Security & Privacy) using published weights. Each scan saves its score with the scoring version, so scores from different versions are never compared. How scoring works.
Website Health#
Website Health is the set of six scored areas behind the Moon Score, and the page in Moonlit Tools that shows them. Each area starts at 100, and each issue lowers it by a little less than the one before, scaled by how many pages it affects. Areas that could not be checked are left out rather than scored as zero.
AI Readiness#
AI Readiness is a separate Moonlit Tools score for how easy a website is for AI search tools to reach, read and quote. It has five parts: Crawlability, Discoverability, Content Clarity, Structured Context and Media Context. It describes readiness only. It is not proof that an AI assistant cited the site, and blocking training-only crawlers never lowers it.
Quick Wins#
Quick Wins are up to 3 recommendations that Moonlit Tools picks from your ranked list: the lowest-effort fixes that recover the most Website Health points. The Free plan shows your Quick Wins with their evidence. Paid plans show the complete list too.
AEO#
AEO, or answer engine optimization, means making your website easy for AI assistants such as ChatGPT, Claude, Perplexity and Google's AI Overviews to find, read and quote. It builds on SEO with extra focus on clear answers that make sense on their own. What answer engine optimization is.
GEO#
GEO, or generative engine optimization, is another name for making content easy for generative AI answers to find and cite. The term comes from a 2023 research paper on how sources get chosen for AI-written answers. In practice it overlaps almost completely with AEO.
llms.txt#
llms.txt is a proposed plain-text file at the root of a website that gives AI tools a short summary of the site and links to its key pages. It is a community proposal, not a web standard, and Google says no special file is needed to appear in its AI features. Moonlit Tools notes whether a site has one, but it doesn't change AI Readiness.
AI Overviews#
AI Overviews are the AI-written summaries Google shows above some search results, with links to the pages they draw on. Google says a page needs to be indexed and eligible to show a snippet to appear as a link, and that no special markup is required. Moonlit Tools checks the parts you control, such as crawler access and snippet settings.
Core Web Vitals#
Core Web Vitals are Google's three measures of real-user page experience: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness, and Cumulative Layout Shift for visual stability. Good is 2.5 seconds or less, 200 milliseconds or less, and 0.1 or less, at the 75th percentile of visits. Moonlit Tools' Performance area uses Chrome UX Report data when it is published, alongside lab tests.
Regression#
A regression is something on a website that used to work and now doesn't, such as a broken link, a lost title or a blocked crawler. Moonlit Tools compares each scan with the previous comparable scan and flags new or worse findings, a category score that dropped, or a lower Moon Score. It says what changed, not why. What a website regression looks like.
robots.txt#
robots.txt is a text file at the root of a website that tells crawlers which paths they may fetch. A crawler follows only the group of rules that names it most specifically, falling back to the * group. It is a request, not a lock: some user-triggered bots may not follow it. Check yours with the free AI Crawler Checker.
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