For a business's own AI: put the business in this directory with its doors (MCP, A2A, OpenAPI, an API, UCP, ACP, a platform's door) and its facts: name, what it is (a category of list_categories or a place category, and one line), where (a storefront, a service area, or online with the countries it ships to), its languages, and agree. One call when its proof is already in place; otherwise the answer gives a challenge to put on its domain (a well-known file, its inbox manifest, a DNS record), a key's signature, or a code sent to an address at its domain, and the next call proves it. The answer names every part not taken and why, its readiness level, and what the next level takes. Doors count once this network's crawler has checked them; a door on another host counts only when the site leads to it or its own document names the business's domain. Mail, phone, messaging, forms and web pages are never doors. Every kind of business is listed except adult services, gambling, weapons, tobacco, cannabis and vaping, payday loans and bail bonds. agree accepts the listing terms (/bot#terms). Being listed is free, and nothing about the order can be bought.