{"id":"PUN-004","name":"Comma after introductory material","domain":"punctuation","layer":"sentence","strength":"context_default","human_logic":"IF introductory material is long, clausal, or potentially misread, THEN add a comma before the main clause ELSE use the lightest mark that preserves clarity.","when":{"all":[{"path":"sentence.introduction.exists","operator":"eq","value":true},{"any":[{"path":"sentence.introduction.type","operator":"eq","value":"clause"},{"path":"sentence.introduction.word_count","operator":"gte","value":5},{"path":"sentence.introduction.misread_risk","operator":"eq","value":true}]}]},"then":[{"action":"insert","target":"sentence.introduction.boundary","value":","}],"else":[{"action":"retain","target":"current_text","reason":"No triggering condition is present."}],"unless":[],"because":"A visible boundary prevents the introduction from being parsed as part of the main clause.","diagnostics":[],"examples":{},"source_ids":["BK-002","BK-007","WEB-011"],"laka":{"smallest_sufficient_intervention":true,"primary_axes":["scope","depth","magnitude","reversibility"]},"requires_facts":["sentence.introduction.exists","sentence.introduction.type","sentence.introduction.word_count","sentence.introduction.misread_risk"],"tests":[],"sources":[{"id":"BK-002","title":"The Blue Book of Grammar and Punctuation","creator":"Jane Straus; Lester Kaufman","domain":"grammar_reference","type":"Book","note":"Accessible grammar, punctuation, examples, and exercises.","url":null},{"id":"BK-007","title":"The Copyeditor's Handbook","creator":"Amy Einsohn; Marilyn Schwartz","domain":"copyediting","type":"Book","note":"Professional copyediting practice, grammar, and editorial process.","url":null},{"id":"WEB-011","title":"Grammar, Punctuation, and Sentence Structure","creator":"Purdue Online Writing Lab","domain":"grammar_reference","type":"University writing resource","note":"Practical mechanics, clause, sentence, punctuation, and style guidance.","url":"https://owl.purdue.edu/owl/general_writing/index.html"}],"defined_in":{"file":"08-punctuation-rules.json","title":"Punctuation as Meaning and Boundary","slug":"punctuation-rules"}}