Glossary

robots.txt

robots.txt is the plain-text file at the root of a site that tells crawlers, by user-agent, which paths they may fetch.

By Reflexa Technologies — the team building Reflexa, the agent that works on your site · updated 16 October 2026

Why it matters

It is the first door. A Disallow that covers a page stops a compliant crawler from ever reading it — and a User-agent: * rule applies to every AI crawler not named separately.

How to see it on your own site

Open https://yourdomain/robots.txt and read the groups.

Free tool →

Checked by Reflexa: Does your robots.txt let AI crawlers in? — part of the 23 checks on every page check.

Related terms

Questions people ask.

What is robots.txt?

robots.txt is the plain-text file at the root of a site that tells crawlers, by user-agent, which paths they may fetch.

Why does it matter for AI visibility?

It is the first door. A Disallow that covers a page stops a compliant crawler from ever reading it — and a User-agent: * rule applies to every AI crawler not named separately.

How do I see it on my own site?

Open https://yourdomain/robots.txt and read the groups. The free tool does it for you →

See it measured on your site.

The free page check runs the 23 checks on your public pages — the terms on this page, observed on your pages.

Run the free check →