Markdown Negotiation Tester
Check if a website serves Markdown content for AI agents. Tests 4 mechanisms: content negotiation (Accept: text/markdown), .md URLs, HTML link tags, and Link HTTP headers.
We will send requests to this URL testing all 4 Markdown for Agents mechanisms.
Results
Content Negotiation
Server responds with text/markdown when Accept: text/markdown header is sent.
Content-Type:
Vary: Accept: ✓ Yes ✗ Missing
Frontmatter:
Size:
.md URL
A Markdown version is available at the .md extension of the URL.
URL:
Content-Type:
Size:
Tried:
<link> Tag
HTML contains a <link rel="alternate" type="text/markdown"> tag pointing to a Markdown version.
href:
Link HTTP Header
The server sends a Link HTTP header with rel="alternate" and type="text/markdown".
URL:
Markdown Preview
What is Markdown for Agents?
Markdown for Agents is a set of mechanisms that allow websites to serve content in Markdown format to AI agents. Instead of parsing complex HTML, agents can request clean Markdown — reducing token usage by up to 80%. There are 4 complementary mechanisms:
Content Negotiation — The server responds to Accept: text/markdown with Markdown content.
.md URLs — A Markdown version is available at /page.md alongside /page.
<link> Tag — The HTML includes <link rel="alternate" type="text/markdown" href="..."> for discovery.
Link Header — The HTTP response includes a Link header pointing to the Markdown version.