geolint

geolint

ESLint for AI search. Lint your website for AI-search readiness — AI crawler access, llms.txt, structured data and citability.

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30-second quickstart

No install, no config:

npx @iliasabk/geolint check yoursite.com

geolint fetches the page, its robots.txt and llms.txt, evaluates 51 known AI crawler tokens against your robots.txt, runs 52 audit rules, and prints a scored report with a concrete fix for every finding.

Why

• AI answers are the new front page. ChatGPT, Perplexity, Claude, Copilot and Google AI Overviews send traffic — or don't — based on whether their crawlers can fetch and quote your pages.
• Most sites accidentally block or confuse AI crawlers. A stale Disallow: /, a noindex left over from staging, a client-rendered page that looks empty to a bot that doesn't run JavaScript.
• Existing tools are blocklists or score-only web apps. They tell you to block everything, or give you a number with no path to improve it. geolint is the linter: concrete findings, concrete fixes, runnable in CI on every PR.

What it checks

52 rules across 5 categories — geolint rules lists them all, and docs/rules.md documents what each rule checks, why it matters and how to fix violations.

Category	Rules	Examples
AI Crawler Access	10	ai-crawler/search-bots-blocked, ai-crawler/wildcard-block-all, ai-crawler/user-fetch-bypass, ai-crawler/stale-tokens
llms.txt	12	llms-txt/missing, llms-txt/invalid-structure, llms-txt/broken-links, llms-txt/relative-links
Structured Data	7	schema/no-jsonld, schema/invalid-jsonld, schema/missing-article-fields
Citability	12	content/thin-content, content/no-h1, content/missing-dates, content/no-question-headings
Technical Foundation	11	technical/client-rendered, technical/https, technical/slow-response, technical/sitemap-missing

What a report looks like

Real output, auditing the bundled demo site (examples/demo-site, which deliberately blocks two bots) — trimmed for width:

$ geolint check localhost:4173 --ignore technical/https

  geolint v0.2.1 — AI-search readiness
  http://localhost:4173/
  200 OK · text/html · TTFB 113ms · robots 200 · llms.txt 404

  ██████████████████████████░░░░  86/100  Grade B

  CATEGORIES
    AI Crawler Access     ███████░░░   70  ✗ 2 errors
    llms.txt              █████████░   92  ⚠ 1 warning · 1 hint
    Structured Data       █████████░   88  ⚠ 1 warning · 3 hints
    Citability            ████████░░   82  ⚠ 2 warnings · 3 hints
    Technical Foundation  ██████████  100  ✓ clean

  AI CRAWLER ACCESS — 49/51 allowed · 2 blocked
    OpenAI
      GPTBot                        ✓  training
      OAI-SearchBot                 ✓  search
      ChatGPT-User                  ✓  user-fetch
    Perplexity
      PerplexityBot                 ✗  search
      Perplexity-User               ✓  user-fetch
    Google
      Googlebot                     ✓  search
      Google-Extended               ✓  training
    … 51 tokens total, grouped by vendor …

  FINDINGS
    AI Crawler Access
      ✗ ai-crawler/search-bots-blocked  PerplexityBot is blocked by robots.txt — Perplexity cannot use your pages as AI answer sources
          fix: Remove the Disallow covering PerplexityBot in robots.txt, or add an explicit "Allow: /" for it.
          evidence: Disallow: / (matched by PerplexityBot)
    llms.txt
      ⚠ llms-txt/missing                No llms.txt found
          fix: Create /llms.txt at the site root: an H1 title, a short blockquote summary, and ## sections linking to your key content.
          evidence: http://localhost:4173/llms.txt → HTTP 404

  ────────────────────────────────────────────────────────────────────
  2 errors · 4 warnings · 7 hints · 32/44 checks passed

Every finding carries a rule id, a severity, the evidence geolint matched, and a fix. Compare two pages or two competitors head-to-head:

geolint check a.com --compare b.com

Commands

Command	What it does	Key flags
geolint check <url>	Audit a single URL	--format, --fail-under, --only/--ignore/--category, --compare, --baseline, --badge, --verbose
geolint crawl <url>	Crawl same-origin pages and audit the whole site	--max-pages, --max-depth, --concurrency, --fail-under
geolint init <url>	Crawl the site and generate a llms.txt	-o, --max-pages
geolint diff <old.json> <new.json>	Compare two JSON reports: score delta, added/resolved findings	—
geolint rules	List the 52 audit rules	--category, --format table|json|markdown
geolint bots	List the 51 known AI crawlers and the impact of blocking each	--format table|json
geolint mcp	Run an MCP server on stdio for AI assistants	--timeout

Full flag reference: docs/configuration.md.

Run it in CI

GitHub Action

- uses: iliasabk/geolint@v1
  id: geolint
  with:
    url: https://example.com
    fail-under: 80

- uses: github/codeql-action/upload-sarif@v3
  if: always()
  with:
    sarif_file: ${{ steps.geolint.outputs.sarif-file }}

The action produces score/grade step outputs, a SARIF report for GitHub code scanning, and a markdown report for job summaries and PR comments. Full recipes — SARIF upload, updating a single PR comment, baseline drift detection — in docs/github-action.md.

Any other CI

npx @iliasabk/geolint check https://example.com --fail-under 80

Exit code is 1 when the score drops below the gate (or findings regress against --baseline), 0 otherwise — works in GitLab CI, CircleCI, npm scripts, pre-deploy hooks.

Show your score as a README badge

npx @iliasabk/geolint check https://example.com --badge
# → writes geolint-badge.svg + prints the markdown snippet to paste

Commit the SVG, or regenerate a shields endpoint JSON in CI (--badge-endpoint) for a badge that never goes stale.

Output formats

-f pretty (default) renders the terminal report above. The machine formats:

• -f json — the full ScanReport: findings, per-category scores, bot access matrix
• -f sarif — SARIF 2.1.0, upload straight to GitHub code scanning
• -f markdown — PR-comment/job-summary-ready tables
• -f html — a self-contained interactive report (score ring, findings filter, bot matrix) you can share or host anywhere

Add -o report.json to write to a file; stdout stays clean for piping.

geolint on the real web

The repo dogfoods itself: a nightly workflow re-audits eight well-known sites and commits the scores back, and the showcase site publishes the full interactive reports — github.com, anthropic.com, stripe.com and more, regenerated on every push to main.

Programmatic API

import { scan } from '@iliasabk/geolint';

const report = await scan('https://example.com', {
  ignore: ['technical/https'],
  timeout: 10_000,
});

console.log(report.score, report.grade);          // e.g. 86 'B'
for (const f of report.findings) {
  console.log(f.severity, f.ruleId, f.message, f.fix);
}

scan(url, options) returns a typed ScanReport. Also exported: the bot registry (AI_BOTS, botsByPurpose), the rule registry (allRules, ruleById), robots.txt/llms.txt parsers, badge generators, scorers and all four reporters.

Use it from AI assistants (MCP)

geolint mcp speaks the Model Context Protocol over stdio — Claude Desktop, Cursor, VS Code and Windsurf can audit sites, generate llms.txt and compare URLs as native tools:

// claude_desktop_config.json / ~/.cursor/mcp.json
{
  "mcpServers": {
    "geolint": {
      "command": "npx",
      "args": ["-y", "@iliasabk/geolint", "mcp"]
    }
  }
}

Five tools: audit_url, generate_llms_txt, compare_urls, list_rules, list_ai_bots — all read-only, with structured output and per-call timeouts. Setup for every client: docs/mcp.md.

The bot registry is the point

geolint bots lists 51 AI crawler tokens with a purpose-aware impact assessment — because "should I block this bot?" has a different answer for each:

Purpose	Examples	If you block it
training	GPTBot, ClaudeBot, CCBot	absent from future training data
search	OAI-SearchBot, PerplexityBot, Claude-SearchBot	invisible in AI answers now
user-fetch	ChatGPT-User, Claude-User	invisible in AI answers now
mixed	Bytespider, Amazonbot, Diffbot	both

And two nuances other tools miss:

• Some fetchers ignore robots.txt. OpenAI, Perplexity and Meta document that their user-triggered fetchers (ChatGPT-User, Perplexity-User, Meta-ExternalFetcher) may not honor robots.txt. ai-crawler/user-fetch-bypass tells you when a Disallow won't work — enforce at the WAF/auth layer instead.
• Stale tokens. anthropic-ai, Claude-Web, FacebookBot are retired. ai-crawler/stale-tokens flags them and names the replacement token — a User-agent: anthropic-ai rule does nothing today.

Control-only tokens like Google-Extended and Applebot-Extended never fetch at all — they only set a preference — and geolint treats them accordingly.

What geolint is honest about

• llms.txt is a proposal, not a standard. No major AI vendor has committed to reading it — so llms-txt/* findings are weighted as warnings and hints, not errors. geolint still checks it (and geolint init generates it) because adoption is growing and the cost is one file.
• Correlation ≠ causation. The citability rules are grounded in published GEO research (quotations/statistics/citations measurably lift share-of-answer; AI crawlers other than Googlebot and Applebot don't execute JavaScript), but signals like question-shaped headings are hints, not facts — they're info severity and geolint says so.
• Every rule shows its reasoning. docs/rules.md documents why each rule exists; the research sources are in docs/research-notes.md, including the vendor docs behind every bot's robots.txt posture.
• The bot registry is a standalone reference. docs/ai-crawlers.md lists every tracked token with purpose, per-vendor robots.txt posture and vendor docs — the same data geolint bots and the list_ai_bots MCP tool expose.

Compared to the alternatives

	Purpose-aware bot registry	Per-vendor robots.txt posture	Runs in CI	Fix per finding	Generates llms.txt	Free / OSS
geolint	✅	✅	✅	✅	✅	✅
ai.robots.txt-style blocklists	❌	❌	n/a	❌	❌	✅
GEO-optimizer skills / prompt packs	❌	❌	❌	❌	❌	varies
llms.txt validators	❌	❌	some	partial	some	✅
Hosted GEO audit web apps	partial	❌	❌	partial	❌	❌

Details and the reasoning behind each column: docs/comparison.md. geolint also ships an MCP server, a score badge and regression baselines.

Roadmap

Planned for v0.4+:

• geolint watch — re-audit on deploys/file changes
• Custom rule API for project-specific checks
• Deeper schema coverage (more @type validators)
• Homebrew formula
• Report localization beyond English

Contributing

Issues and PRs welcome — see CONTRIBUTING.md. New rules are the best contribution: each needs a check(ctx), findings with fix, a test and a docs entry.

License

MIT · changelog · security

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