{"id":"CPY-016","name":"Email subject matches message and destination","domain":"copywriting","layer":"phrase","strength":"hard_constraint","human_logic":"IF a subject line creates curiosity or a promise, THEN the email and linked destination must satisfy it ELSE revise.","when":{"path":"copy.email_subject.exists","operator":"eq","value":true},"then":[{"action":"verify","target":"copy.email_subject.payoff","across":["email_body","linked_destination"]},{"action":"revise","target":"copy.email_subject","when":"mismatch"}],"else":[{"action":"retain","target":"current_text","reason":"No triggering condition is present."}],"unless":[],"because":"Open-rate tactics that break the content promise trade attention for distrust.","diagnostics":[],"examples":{},"source_ids":["BK-029","BK-032","WEB-012"],"laka":{"smallest_sufficient_intervention":true,"primary_axes":["scope","depth","magnitude","reversibility"]},"requires_facts":["copy.email_subject.exists"],"tests":[],"sources":[{"id":"BK-029","title":"The Adweek Copywriting Handbook","creator":"Joseph Sugarman","domain":"copywriting","type":"Book","note":"Direct-response copy principles, sequencing, and engagement.","url":null},{"id":"BK-032","title":"The Copywriter's Handbook","creator":"Robert W. Bly","domain":"copywriting","type":"Book","note":"Benefits, headlines, offers, direct response, and business copy.","url":null},{"id":"WEB-012","title":"Advertising and Marketing Basics","creator":"U.S. Federal Trade Commission","domain":"advertising_compliance","type":"Regulatory guidance","note":"Advertising claims must be truthful, non-deceptive, fair, and appropriately substantiated.","url":"https://www.ftc.gov/business-guidance/advertising-marketing"}],"defined_in":{"file":"16-copywriting-rules.json","title":"Persuasive and Direct-Response Copy Rules","slug":"copywriting-rules"}}