Seedless, a Philadelphia start-up, makes synthetic legal data by inventing companies from scratch, down to their merger histories, office friction, and a flu season that hits in November. AI agents play every employee, producing thousands of emails, chats, contracts, and audio files that hold to one story, deliberate mistakes included, while a separate system writes the answer key as the data is generated. The result is something client data and the Enron emails can’t offer: a test legal AI tools have never seen, with a record of everything in it. Buyers use the data to compare tools against the same answer key, and vendors use it to find blind spots before their customers do.