Anyone who consults a lawyer about possibly engaging the lawyer for a matter is a prospective client. Even where no engagement follows, what the lawyer learned may not be used or revealed except as Rule 1.9 would allow for a former client, and the lawyer may not act against the prospective client in the same or a substantially related matter where the information received could cause significant harm, a bar that extends to the lawyer's firm. The firm may nonetheless act where the affected client and the prospective client both consent in writing after full information, or where the lawyer who took the information limited it to what was reasonably needed to decide whether to accept the matter, is promptly walled off from the matter, and the prospective client is told in writing without delay.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.