# Prominent summary block

> Prominent summary block: The llms.txt contract recommends a short summary at the top of every page; agents quote it directly.

- Source: /checks/summary
- Site: AgenticWebScore
- Language: English

---
The llms.txt contract recommends a short summary at the top of every page; agents quote it directly.

| Property | Value |
| --- | --- |
| Check id | `summary` |
| Dimension | Content Accessibility (22%) |
| Tier | Recommended — pool 20 pts |
| Weight inside tier | 1 |
| Impact | Medium |
| Maturity | Draft — A published specification that is not yet ratified. |
| Conditional | No |
| Publishing skill | `page-summary` |
| Standards | — |

## What is measured

The scanner strips `<script>`, `<style>` and `<noscript>` from the homepage `/`, takes the main content region (`<main>`, otherwise the body) and reads its first 1000 characters. Pass when a 40-320 character paragraph appears there before the first `<h2>` — an element whose `class` or `id` contains `summary`, `lede` or `intro` also counts; partial when a summary exists but starts after the first `<h2>` or falls outside 40-320 characters; fail when the first 1000 characters of main content hold no such paragraph. The llms.txt contract asks for this short summary at the top of every page.

## Reproduce it yourself

You do not have to take our word for any of this. Run the same measurement against your own domain:

```bash
DOMAIN="https://example.com"
curl -sL "$DOMAIN/" | perl -0777 -ne 's{<(script|style|noscript)[^>]*>.*?</\1>}{}gsi; m{<main[^>]*>(.*?)</main>}si and $_=$1; s/<[^>]*>/ /g; s/\s+/ /g; print substr($_,0,260),"\n"'
```

## The fix

This is the artifact to ship. It is the complete change, not a description of one.

```html
<main>
  <h1>Token efficiency for agent-readable pages</h1>
  <p class="summary">
    Content-to-markup ratio is the share of a page's bytes an agent can actually read: below 15%
    most of your HTML is scaffolding, and every wrapper div is billed to someone's context window.
  </p>
  <h2>How the ratio is measured</h2>
  <p>We strip script, style and template blocks, remove the remaining tags and divide the visible
  characters by the raw HTML size.</p>
</main>
```

> Keep it to two or three sentences: the block is quoted verbatim, so "Welcome to our website" spends the quote on nothing.

## Related checks

| Check | Tier | Impact | Same skill |
| --- | --- | --- | --- |
| `markdown-negotiation` — Markdown content negotiation | Recommended | Critical | — |
| `headings` — Semantic heading structure | Essential | High | — |
| `meta` — Title and summary metadata | Essential | High | — |
| `jsonld` — JSON-LD structured data | Essential | Critical | — |
| `faq-schema` — FAQ / question-answer schema | Recommended | High | — |
| `breadcrumb` — Breadcrumb / navigation schema | Emerging | Low | — |
| `lang` — Language declaration and multilingual access | Recommended | Medium | — |
| `no-js-fallback` — Content that needs no JavaScript | Essential | High | — |