Bolt
Missing robots.txt on a Bolt app
Bolt serves a live preview from the project you are editing. That preview is a public address. Code that looks private in the editor is still in the script the preview downloads.
A launch file, not a security boundary.
What the scan can see
The scan requests /robots.txt and /sitemap.xml. A 404, or an HTML app shell, counts as missing. A noindex meta tag or X-Robots-Tag on the homepage is a separate finding, because a public launch usually wants to be indexed.
What it does not do
robots.txt does not hide a URL that is already linked. It is not an access control.
The scan does not sign into Bolt or read the editor. It only requests the URL you paste and a short, fixed list of paths on that host.
What to do next
Serve a plain-text robots.txt and an XML sitemap. Remove noindex from the homepage if the app should be found. Keep noindex on private pages such as this scan report.
Questions
Does this open my Bolt project?
No. The scan does not sign into Bolt or read the editor. It only requests the URL you paste and a short, fixed list of paths on that host.
Can the scan prove missing robots.txt is fully fixed?
robots.txt does not hide a URL that is already linked. It is not an access control.
What should I do if the scan finds it?
Serve a plain-text robots.txt and an XML sitemap. Remove noindex from the homepage if the app should be found. Keep noindex on private pages such as this scan report.
Scan a URL you own
The same free check as the homepage. You confirm the app is yours before it runs.