aeo.robots-txt-unreachable
robots.txt answers a server error or does not answer, and crawlers treat that as "crawl nothing" (RFC 9309).
What to change
Make /robots.txt answer 200, or 404 when there is none. A 5xx or a timeout stops well-behaved crawlers, AI crawlers included.
The documentation on developers.google.comA finding of this rule on a page carries the exact edits for that page: the markup it quotes, and what to write instead.
When it runs
Runs on every AEO audit: of a page, a crawl, a build directory or HTML. A warning is a problem that costs a page ranking, clicks or citations. Each finding takes 5 points off the page's score.
The severity here is the rule's usual one: a finding can be raised or lowered when the page gives a reason.
Run it, or skip it
Check a page for this rule alone, after a fix for instance:
npx @rivi-software/agentic-seo-check aeo https://example.com --rule aeo.robots-txt-unreachable
Or from an assistant, with the MCP tool seo_aeo_audit:
{
"url": "https://example.com",
"rules": [
"aeo.robots-txt-unreachable"
]
}
To leave it out of an audit, pass --disable aeo.robots-txt-unreachable on the command, or disableRules: ["aeo.robots-txt-unreachable"] to a tool.
More in AI answer engines
All 32 rules- Warning
aeo.article-dates-missingArticle structured data lacks datePublished (warning) or dateModified (info), which tell answer engines how fresh the content is. - Info
aeo.article-date-not-visibleThe article's structured data has a date, but the page shows none. - Info
aeo.organization-missingThe home page has no Organization (or Person) structured data. - Info
aeo.entity-same-as-missingOrganization or Person structured data has no sameAs links to the entity's profiles elsewhere. - Error
aeo.robots-blocks-search-crawlerrobots.txt blocks a search crawler whose index AI answers draw on: Googlebot (AI Overviews, AI Mode), Bingbot (Copilot) or Applebot (Siri, Spotlight). - Warning
aeo.robots-blocks-answer-botrobots.txt blocks a bot that fetches pages for AI answers or an AI search index (OAI-SearchBot, ChatGPT-User, Claude-SearchBot, Claude-User, PerplexityBot, Perplexity-User, Google-Extended, DuckAssistBot, MistralAI-User, Amzn-SearchBot, Amzn-User, meta-webindexer, meta-externalfetcher, MistralAI-Index, YandexAdditional). - Info
aeo.robots-blocks-training-botrobots.txt blocks a crawler that collects text to train AI models (GPTBot, ClaudeBot, Applebot-Extended, CCBot, meta-externalagent, Amazonbot, MistralAI-Training). - Warning
aeo.content-signal-blocks-answersA robots.txt Content-Signal line sets ai-input=no or search=no, asking answer engines not to use the pages in AI answers or search.