answer-beacon

Check that your built static site is ready for answer engines and AI search: direct answers, FAQ schema, llms.txt, AI crawler access and E-E-A-T signals.

Answer engines (ChatGPT search, Perplexity, Claude, Google AI Overviews) quote pages that answer a question in the first sentence, mark it up, let their crawlers in and show who wrote it and when. Sites lose that in small ways: a blanket User-agent: * Disallow: / that also blocks GPTBot, FAQ schema whose questions are not on the page, a question heading followed by a 200-word preamble, an llms.txt with broken links. answer-beacon reads the build, robots.txt and llms.txt and reports each gap with the file, line, severity and a concrete fix.

CLI, library and GitHub Action. Node.js 18+, zero runtime dependencies. Works on any static build output (Astro, Next.js output: 'export', Eleventy, Hugo, Jekyll, Docusaurus, VitePress, plain HTML) and runs offline: point it at the folder your build writes. By Louis Wright.

Features

Direct answers: question-style headings (What…, How…, …?) must be followed by a paragraph or list that answers them, and the first paragraph should be short enough to quote (--max-answer-words, default 60).
FAQ / QAPage / HowTo schema: every Question needs name and acceptedAnswer.text (QAPage also accepts suggestedAnswer), FAQ questions must be visible on the page, HowTo needs steps with text, and pages answering 3+ questions are nudged to add FAQPage.
llms.txt: present, H1 title, ## sections of - [name](url): notes links, and internal links that exist in the build.
AI crawler access in robots.txt: GPTBot, OAI-SearchBot, ChatGPT-User, ClaudeBot, Claude-SearchBot, PerplexityBot and Google-Extended allowed by default (--allow-bots), with --block-bots for crawlers you want kept out (CCBot, Bytespider, ...). Uses real robots.txt group and longest-match semantics, including User-agent: * fallback.
AI meta tags: noai/noimageai and bot-specific <meta name="GPTBot" content="noindex"> on pages you want quoted.
E-E-A-T: article-like pages need an author and a date; dateModified must not precede datePublished; homepage Organization/Person/WebSite schema; an About or Contact page.
Text/JSON/SARIF/Markdown output, --fail-on, exit codes 0/1/2, allowlist with expiry, severity overrides, GitHub Action with job summary.

Scope

answer-beacon only reads robots.txt for AI-crawler rules; general robots.txt hygiene is covered by securitytxt-sentinel. Meta robots / X-Robots-Tag indexability is index-beacon, and general schema.org validation is schema-beacon.

Rules

Rule	Default severity	What it means
`ai-crawler-blocked`	high	robots.txt blocks an AI crawler you want to allow (GPTBot, ClaudeBot, PerplexityBot, Google-Extended, ...)
`ai-crawler-allowed`	medium	robots.txt allows an AI crawler you asked to block
`ai-meta-blocked`	medium	Page meta tags block AI use (noai, noimageai, or a bot-specific noindex for an AI crawler)
`faq-schema-invalid`	high	FAQPage / QAPage JSON-LD is missing Question name or acceptedAnswer text
`faq-schema-mismatch`	medium	FAQ schema questions do not appear as visible text on the page
`howto-schema-invalid`	medium	HowTo JSON-LD has no step list or steps without text
`question-no-answer`	medium	Question-style heading is not followed by a paragraph answering it
`answer-too-long`	low	The first paragraph after a question heading is too long to quote as a direct answer
`faq-schema-missing`	low	Page has several question headings with answers but no FAQPage/QAPage schema
`llms-txt-missing`	low	No /llms.txt in the build
`llms-txt-invalid`	medium	llms.txt does not follow the format (H1 title, optional > summary, ## sections of - name links)
`llms-txt-link-missing`	medium	llms.txt links to a page that is not in the build
`author-missing`	low	Article-like page has no author (meta author, JSON-LD author or rel=author)
`date-missing`	low	Article-like page declares no published or modified date
`date-modified-before-published`	low	dateModified is earlier than datePublished
`eeat-pages-missing`	info	No about or contact page found in the build
`organization-schema-missing`	info	Homepage has no Organization/Person/WebSite JSON-LD
`allowlist-expired`	medium	An allowlist entry is past its `expires` date
`allowlist-unused`	info	An allowlist entry matched nothing

Install and run

npx answer-beacon dist
npx answer-beacon dist --block-bots CCBot,Bytespider --fail-on medium
npx answer-beacon public --allow-bots GPTBot,PerplexityBot --max-answer-words 45
npx answer-beacon out --no-llms-txt --not-articles "/docs/**"

Pages are mapped to URLs the way static hosts serve them: index.html → /, blog/index.html → /blog/, about.html → /about.html (or /about with --clean-urls). Pass --base-url with your public URL, or let it be inferred from canonical / og:url tags. Meta-refresh redirect stubs and 404.html are skipped. X-Robots-Tag and Link headers are read from Netlify/Cloudflare _headers and vercel.json.

Sample output

answer-beacon — https://example.com
6 indexable page(s); 5 question heading(s); robots.txt found; llms.txt found

HIGH     faq.html:1 Question "No answer?" is missing acceptedAnswer.text [faq-schema-invalid]
         ↳ fix: Each Question needs "name" and acceptedAnswer with "text".
HIGH     robots.txt robots.txt blocks GPTBot from / [ai-crawler-blocked]
         ↳ fix: Add "User-agent: GPTBot\nAllow: /" or remove the Disallow, or move GPTBot to blockBots if this is intended.
HIGH     robots.txt robots.txt blocks OAI-SearchBot from / (via User-agent: *) [ai-crawler-blocked]
         ↳ fix: Add "User-agent: OAI-SearchBot\nAllow: /" or remove the Disallow, or move OAI-SearchBot to blockBots if this is intended.
HIGH     robots.txt robots.txt blocks ChatGPT-User from / (via User-agent: *) [ai-crawler-blocked]

Options

answer-beacon 1.0.0 — check your built static site is ready for answer engines and AI search

Usage: answer-beacon [site-dir] [options]

Site
      --base-url <url>        Public URL of the site, e.g. https://example.com (default: inferred from canonical/og:url)
      --include <globs>       Only check these pages (file or URL path globs, comma-separated)
      --exclude <globs>       Skip these pages
      --clean-urls            Pages are served without .html (about.html -> /about)
Checks
      --allow-bots <names>     AI crawlers that must be allowed in robots.txt (default: GPTBot, OAI-SearchBot,
                               ChatGPT-User, ClaudeBot, Claude-SearchBot, PerplexityBot, Google-Extended)
      --block-bots <names>     AI crawlers that must be blocked
      --max-answer-words <n>   Longest acceptable direct answer paragraph (default 60)
      --no-llms-txt            Do not require /llms.txt
      --not-articles <globs>   Pages that should not be checked for author/date

Common
  -c, --config <file>     JSON config (default: .answer-beacon.json or "answerBeacon" in package.json)
  -f, --format <fmt>      text (default) | json | sarif | markdown
      --json <file>       Also write a JSON report
      --sarif <file>      Also write SARIF 2.1.0
      --markdown <file>   Also write Markdown (e.g. for a job summary)
      --fail-on <sev>     critical | high | medium | low | info | none (default: high)
      --list-rules        Print rules and default severities
      --no-fixes          Hide fix suggestions in text output
      --no-color          Disable colours
  -v, --version / -h, --help

Exit codes: 0 = passed, 1 = findings at or above --fail-on, 2 = usage, config or read error.

Configuration and allowlist

Options can live in .answer-beacon.json (or a "answerBeacon" key in package.json, or --config <file>):

{
  "failOn": "medium",
  "severity": {
    "ai-crawler-blocked": "low"
  },
  "allowlist": [
    {
      "rule": "llms-txt-missing",
      "subject": "llms.txt",
      "reason": "llms.txt is being written",
      "expires": "2027-03-31"
    }
  ],
  "allowBots": [
    "GPTBot",
    "ClaudeBot",
    "PerplexityBot",
    "Google-Extended"
  ],
  "blockBots": [
    "CCBot"
  ],
  "maxAnswerWords": 60
}

severity changes a rule's severity, or turns it "off".
allowlist entries suppress matching findings. Each needs a reason and matches on any combination of rule, file, subject (globs with *) and match (a substring of the message). Add expires (YYYY-MM-DD) so the exception is time-boxed: once it lapses the finding comes back along with an allowlist-expired finding (medium). Entries that no longer match anything are reported as allowlist-unused (info).

Config can also set baseUrl, include, exclude and cleanUrls. The config file is looked up in the site directory first, then in the current directory, so .answer-beacon.json can live at your repository root. Other keys: allowBots, blockBots, maxAnswerWords, "requireLlmsTxt": false, notArticles (globs) and faqMinQuestions (default 3).

Output and exit codes

--format text (default), json, sarif (SARIF 2.1.0 for GitHub code scanning) or markdown (for job summaries and PR comments). --json, --sarif and --markdown write extra report files in the same run.
--fail-on <severity> sets the threshold (critical, high, medium, low, info, none; default high).
Exit codes: 0 passed, 1 findings at or above --fail-on, 2 usage, config or read error.

GitHub Action

permissions:
  contents: read
  security-events: write   # only needed for the SARIF upload
jobs:
  answer-beacon:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
        with: { persist-credentials: false }
      - run: npm ci && npm run build   # produce the static site first
      - uses: MrLouisWright/answer-beacon@v1
        with:
          path: dist
          fail-on: high
          sarif: answer-beacon.sarif
      - uses: github/codeql-action/upload-sarif@v3
        if: always()
        with: { sarif_file: answer-beacon.sarif }

Input	Description	Default
`path`	Built site directory (e.g. dist, public, _site)	`.`
`base-url`	Public URL of the site, e.g. https://example.com
`fail-on`	Failure threshold	`high`
`config`	Config file path
`sarif` / `json`	Write SARIF / JSON report to this path
`job-summary`	Add the Markdown report to the job summary	`true`
`args`	Extra CLI arguments

The action runs the bundled CLI with Node 20; it has no dependencies to install. Pin it to a commit SHA if your policy requires it.

Library

import { check, parseRobots, robotsAllows, parseLlmsTxt } from "answer-beacon";
const report = check("dist", { blockBots: ["CCBot"] });
robotsAllows(parseRobots(txt), "GPTBot", "/"); // { allowed, explicit }

Types are included.

Requirements

Node.js 18 or newer. Zero runtime dependencies.

Support

If this project is useful to you, you can support its development with a donation: Buy me a coffee. It helps keep these tools maintained, documented and free for everyone.

Credit (optional)

Free to use under MIT, no attribution required. If answer-beacon helps you, a link back is appreciated:

<a href="https://louiswright.co.uk">Built with answer-beacon by Louis Wright</a>

[![Built with answer-beacon by Louis Wright](https://img.shields.io/badge/built%20with-answer--beacon-blue)](https://louiswright.co.uk)