Glossary
Content-Signal
In short
A robots.txt line from the Content Signals Policy that states yes or no for three uses: search, ai-input and ai-train. 6.4 percent of top-10,000 robots.txt files (380 of 5,938) carry a Content-Signal line. Example: Cloudflare's example: "Content-Signal: search=yes, ai-train=no". Related: What Content-Signals changes and robots.txt builder.
Definition
A robots.txt line from the Content Signals Policy that states yes or no for three uses: search, ai-input and ai-train.
Sourced example
Cloudflare's example: "Content-Signal: search=yes, ai-train=no". Source, read 2026-11-04.
How it shows up here
6.4 percent of top-10,000 robots.txt files (380 of 5,938) carry a Content-Signal line.
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Sources
Last reviewed 2026-11-04