---
title: "Content-Signal: glossary: Agent Ready HTML"
description: "Content-Signal defined: A declaration of permitted AI uses (ai-train, search, ai-input), sent as a robots.txt line or a response header."
canonical: https://agentreadyhtml.com/glossary/content-signal/
site: "Agent Ready HTML"
last_updated: 2026-11-04
section: "Glossary"
---

# Content-Signal: glossary: Agent Ready HTML

> Content-Signal defined: A declaration of permitted AI uses (ai-train, search, ai-input), sent as a robots.txt line or a response header.

Source: https://agentreadyhtml.com/glossary/content-signal/
Site: Agent Ready HTML
Last reviewed: 2026-11-04

# Content-Signal

In short

A declaration of permitted AI uses (ai-train, search, ai-input), sent as a robots.txt line or a response header. Example: Markdown for Agents responses carry Content-Signal: ai-train=yes, search=yes, ai-input=yes. Related terms: Edge conversion, Content negotiation. Edge conversion: Turning origin HTML into another format at the CDN, without changing the origin.

## Source of the example

The example in the summary above is from [blog.cloudflare.com](https://blog.cloudflare.com/markdown-for-agents/), read 4 November 2026.

## Where it shows up on this site

-   [Method](https://agentreadyhtml.com/method/)

## Neighbouring terms

-   [Edge conversion](https://agentreadyhtml.com/glossary/edge-conversion/): Turning origin HTML into another format at the CDN, without changing the origin.
-   [Content negotiation](https://agentreadyhtml.com/glossary/content-negotiation/): The HTTP mechanism where the client states preferred formats in the Accept header and the server picks a representation for the same URL.

## Sources

1.  [blog.cloudflare.com](https://blog.cloudflare.com/markdown-for-agents/) https://blog.cloudflare.com/markdown-for-agents/, read 4 November 2026

Last reviewed 4 November 2026

Edition

Crawl

2026-11-04

Page updated

2026-11-04

Method

How the viewer reads a page, how a file is graded and how a platform is scored: [the method page](https://agentreadyhtml.com/method/).