# Step 5 — the MCP server card

/.well-known/mcp/server-card.json (SEP-1649) advertises the MCP endpoint, transport, and tool surface so an assistant can attach without a human pasting a URL. Host the endpoint on its own name — mcp.yourdomain.com — and keep the card in sync with the tool catalog.

Canonical: https://robauto.ai/learn/advanced-agentic-commerce/7

_Advanced Agentic Commerce: Ship the Full Agent Surface — lesson 7 of 20 (DEFINITION)_

/.well-known/mcp/server-card.json (SEP-1649) advertises the MCP endpoint, transport, and tool surface so an assistant can attach without a human pasting a URL. Host the endpoint on its own name — mcp.yourdomain.com — and keep the card in sync with the tool catalog.

Source: [Model Context Protocol](https://modelcontextprotocol.io?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