---
title: "Markdown twin: glossary: Agent Ready HTML"
description: "Markdown twin defined: A markdown copy of a page at a predictable URL, such as page.md or page.html.md. A dated, sourced example follows."
canonical: https://agentreadyhtml.com/glossary/markdown-twin/
site: "Agent Ready HTML"
last_updated: 2026-11-04
section: "Glossary"
---

# Markdown twin: glossary: Agent Ready HTML

> Markdown twin defined: A markdown copy of a page at a predictable URL, such as page.md or page.html.md. A dated, sourced example follows.

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

# Markdown twin

In short

A markdown copy of a page at a predictable URL, such as page.md or page.html.md. Example: GitBook returns markdown when .md is appended to any published page URL. Related terms: Accept header, Content negotiation, Markdown negotiation, Vary: Accept, OpenAPI. Accept header: The request header that lists media types a client will take, with optional q weights.

## Source of the example

The example in the summary above is from [gitbook.com](https://gitbook.com/docs/publishing-documentation/llm-ready-docs), read 4 November 2026.

## Where it shows up on this site

-   [Guide: serve markdown on request](https://agentreadyhtml.com/guides/serve-markdown-on-request/)

## Neighbouring terms

-   [Accept header](https://agentreadyhtml.com/glossary/accept-header/): The request header that lists media types a client will take, with optional q weights.
-   [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.
-   [Markdown negotiation](https://agentreadyhtml.com/glossary/markdown-negotiation/): Content negotiation where Accept: text/markdown returns the page as markdown with Content-Type text/markdown.
-   [Vary: Accept](https://agentreadyhtml.com/glossary/vary-accept/): A response header telling caches that the body depends on the Accept header, so HTML and markdown are stored separately.
-   [OpenAPI](https://agentreadyhtml.com/glossary/openapi/): A machine-readable description of an HTTP API, usually openapi.json or openapi.yaml.

## Sources

1.  [gitbook.com](https://gitbook.com/docs/publishing-documentation/llm-ready-docs) https://gitbook.com/docs/publishing-documentation/llm-ready-docs, 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/).