A robots.txt file asks agents to stay away from certain paths. Whether they do is a different matter. SynthTrail shows the paths agents really opened, so you can compare behaviour with your rules.
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You write a robots.txt, add some paths and assume they are respected. Well-behaved crawlers honour it. Many agents acting for a user, and any that choose not to, do not. Without evidence, you do not know which is which.
Open a session trail and read the list of paths the agent opened. Then check them against the paths in your robots.txt. A path you disallowed that shows up in a trail was opened regardless of your request.
This is not a live testing tool: SynthTrail does not fetch your robots.txt and score agents automatically. It gives you the real trail to compare with. And remember that robots.txt is not security; protect private content with sign-in.
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