# Step 11 — Markdown content negotiation

Agents that send Accept: text/markdown should get clean Markdown; browsers asking for text/html keep the page. Prerender a .md twin per route, serve it with Vary: Accept and a token-count header, and rank markdown only when the client actually prefers it.

Canonical: https://robauto.ai/learn/advanced-agentic-commerce/13

_Advanced Agentic Commerce: Ship the Full Agent Surface — lesson 13 of 20 (PLAYBOOK)_

Agents that send Accept: text/markdown should get clean Markdown; browsers asking for text/html keep the page. Prerender a .md twin per route, serve it with Vary: Accept and a token-count header, and rank markdown only when the client actually prefers it.

Source: [Robauto — markdown index](https://robauto.ai/markdown-index.json)

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Machine surfaces: https://robauto.ai/llms.txt · https://robauto.ai/llms-full.txt · https://robauto.ai/.well-known/api-catalog