# Content-Signal directive

[3 · Permit](/category/permit/)

| Content-Signal directive |
| --- |
| Category | [Permit](/category/permit/) |
| Also known as | Content-Signal, ai-train, ai-input |
| Related | [Content Signals Policy](/protocols/cloudflare-content-signals-policy/), [AI Crawler User-Agent Tokens in robots.txt](/protocols/ai-crawler-tokens-robots/) |

[Permit](/category/permit/) Content-Signal is a machine-readable policy directive introduced by Cloudflare's Content Signals Policy that publishers place in robots.txt or HTTP response headers (Content-Signal: search=yes, ai-input=yes, ai-train=no) to express separate permissions for search indexing (search), live RAG/grounding retrieval (ai-input), and foundation model training (ai-train). It complements per-bot User-agent rules (GPTBot, ClaudeBot, OAI-SearchBot) and aligns with the IETF AIPREF vocabulary effort. Used by: cloudflare-content-signals-policy, ai-crawler-tokens-robots.

## Instances

Not applicable.

## See also

- [Content Signals Policy](/protocols/cloudflare-content-signals-policy/)
- [AI Crawler User-Agent Tokens in robots.txt](/protocols/ai-crawler-tokens-robots/)

## References

- [https://blog.cloudflare.com/content-signals-policy/](https://blog.cloudflare.com/content-signals-policy/) (2026-09-05) VERIFIED
- [https://developers.cloudflare.com/bots/additional-configurations/managed-robots-txt/](https://developers.cloudflare.com/bots/additional-configurations/managed-robots-txt/) (2026-09-05) VERIFIED

[JSON](/terms/content-signal/index.json) · [Markdown](/terms/content-signal/index.md) · [OKF v0.2](/okf/terms/content-signal.md)