Ask your host, or the maker of the WooCommerce plugin that runs your bookings, shop or contact form, whether it offers an agent door (an MCP server or an API) on your own domain, and name it in your llms.txt.
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A customer's assistant can ask you a question and come back for your answer, instead of telling them to call.
Add send_message to your MCP server, or publish an A2A agent card at /.well-known/agent-card.json whose endpoint answers A2A requests.
Publish a door that takes messages: an A2A agent whose endpoint answers, a send_message tool on an MCP server, or an agent inbox.
What counts: send_message, contact, ask_question, create_support_ticket, POST /messages. An agent inbox, an A2A agent whose endpoint answers, or a tool that sends you a message or opens a support ticket, on an MCP server of your own or one your UCP profile declares as a service. Email, phone, forms and chat widgets are made for people, so they don't count, and neither does a question-answering tool your website platform puts on every store.