Signal
Machine-readable page representation
Serving a token-light Markdown copy of a page, either via same-URL Accept negotiation or a distinct .md mirror, and advertising it with rel=alternate, hands agents a cheaper-to-read representation of the same facts.
Per-platform status
Where a platform documents relevant behavior, its status and source are shown. Undocumented platforms show "unknown" - honest unknowns, never invented.
| Platform | Status | Notes | Source |
|---|---|---|---|
| ChatGPT | Unknown | Not documented by this platform. | - |
| Gemini / Google AI Mode | Unknown | Not documented by this platform. | - |
| Perplexity | Unknown | Not documented by this platform. | - |
| Copilot | Unknown | Not documented by this platform. | - |
| Claude | Unknown | Not documented by this platform. | - |
Evidence and sources
This signal is typed hypothesis (Low confidence).
- Vercel, Making agent-friendly pages with content negotiation (opens in new tab) · 2026-02-03
- Pronovix, How to serve Markdown to AI agents (opens in new tab) · 2026-03-24
- MDN, HTTP content negotiation (opens in new tab)
- Mintlify, Cloudflare, and Vercel agent-Markdown guides (opens in new tab) · 2026-01-29
- Google, Optimizing your website for generative AI features on Google Search (opens in new tab)
How to act on this
Ship a .md mirror or Accept negotiation with a rel=alternate hint and a canonical on the HTML, but do not attribute a selection outcome to it.
Handbook chapters