# Step 1 — Link headers (RFC 8288 / 9727)

The homepage response itself should point at your machine files. Emit Link headers with registered relations: api-catalog, service-desc, service-doc, describedby. One HEAD request and the agent knows where everything lives — no HTML scraping.

Canonical: https://robauto.ai/learn/advanced-agentic-commerce/3

_Advanced Agentic Commerce: Ship the Full Agent Surface — lesson 3 of 20 (DEFINITION)_

The homepage response itself should point at your machine files. Emit Link headers with registered relations: api-catalog, service-desc, service-doc, describedby. One HEAD request and the agent knows where everything lives — no HTML scraping.

Source: [IETF RFC 9727 §3](https://www.rfc-editor.org/rfc/rfc9727#section-3?utm_source=robauto)

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