Missing meta description
Part of Documentation, UX & Accessibility, which counts for 15% of the overall score. When this check fires it deducts 2 points from that category, once per scan, no matter how many places it turns up.
What it detects
No <meta name="description"> tag found, which hurts SEO/link-preview quality.
Why it matters
When there is no meta description, search engines and link unfurlers (Slack, iMessage, social cards) pick an arbitrary snippet of page text to show under your link, and it usually reads badly. Writing your own does not change ranking much, but it changes whether people click and what your shared links look like. It is a small, fully controllable piece of how the page presents itself.
How to fix it
Add <meta name="description" content="..." /> to the <head> of each HTML document, one or two plain sentences (roughly 150 characters) saying what the page offers. Write it for a human deciding whether to click, not as a keyword list. Give each page its own description rather than duplicating one across the site.
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