{"id":"CPY-003","name":"Headline makes one credible promise","domain":"copywriting","layer":"phrase","strength":"hard_constraint","human_logic":"IF a headline is used, THEN make its audience relevance, benefit or curiosity, and credible scope legible ELSE revise.","when":{"path":"copy.headline.exists","operator":"eq","value":true},"then":[{"action":"verify","target":"copy.headline","require":["audience_relevance","benefit_or_curiosity","credible_scope"]},{"action":"revise","target":"copy.headline","when":"requirement_missing"}],"else":[{"action":"retain","target":"current_text","reason":"No triggering condition is present."}],"unless":[],"because":"The headline earns attention by promising a relevant payoff without outrunning proof.","diagnostics":[],"examples":{},"source_ids":["BK-029","BK-030","BK-032","BK-036"],"laka":{"smallest_sufficient_intervention":true,"primary_axes":["scope","depth","magnitude","reversibility"]},"requires_facts":["copy.headline.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-030","title":"Breakthrough Advertising","creator":"Eugene M. Schwartz","domain":"copywriting","type":"Book","note":"Market awareness, sophistication, desire, and message strategy.","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":"BK-036","title":"Ogilvy on Advertising","creator":"David Ogilvy","domain":"advertising","type":"Book","note":"Research, clarity, headlines, layouts, and brand communication.","url":null}],"defined_in":{"file":"16-copywriting-rules.json","title":"Persuasive and Direct-Response Copy Rules","slug":"copywriting-rules"}}