Altdown

This site, as an agent sees it

altdown.org publishes every page in the format it describes. Each page names its Markdown copy, each copy names its page, and one index lists them all. The examples below are generated from the live files on every build.

Every page and its copy

Page Copy
/ /index.md
/1.0/ /1.0/index.md
/agents/ /agents/index.md
/changes/ /changes/index.md
/spec/ /spec/index.md

The head of the specification page 

<link rel="canonical" href="https://altdown.org/spec/">
<link rel="alternate" type="text/markdown" href="/spec/index.md">
<link rel="alternate" type="application/feed+json" href="/altdown.json" title="Altdown index">

The top of its copy 

---
altdown: 1
canonical: https://altdown.org/spec/
title: Altdown Specification
published: 2026-10-31T00:00:00Z
updated: 2026-10-31T22:20:27Z
lang: en
tokens: 10730
tokenizer: cl100k_base
author: Vivek Chopra
signals: search=yes, ai-input=yes, ai-train=yes
generator: altdown.org-gen 0.1
---

# Altdown Specification

Version 1.0 (Draft) · October 31, 2026
…

robots.txt 

User-agent: *
Content-Signal: search=yes, ai-input=yes, ai-train=yes
Allow: /

Sitemap: https://altdown.org/sitemap.xml
Altdown: https://altdown.org/altdown.json

The index

The full index is at /altdown.json. Its entry for the specification:

{
  "id": "https://altdown.org/spec/",
  "url": "https://altdown.org/spec/",
  "title": "Altdown Specification",
  "date_published": "2026-10-31T00:00:00Z",
  "date_modified": "2026-10-31T22:20:27Z",
  "attachments": [
    {
      "url": "https://altdown.org/spec/index.md",
      "mime_type": "text/markdown",
      "size_in_bytes": 44714,
      "_altdown": {
        "tokens": 10730,
        "signals": "search=yes, ai-input=yes, ai-train=yes"
      }
    }
  ]
}

What this site does

Check it yourself 

curl -s https://altdown.org/spec/ | grep 'type="text/markdown"'
curl -sI https://altdown.org/spec/index.md | grep -i content-type
curl -s https://altdown.org/robots.txt | grep Altdown
curl -s https://altdown.org/altdown.json | head