Video Description SEO Optimizer

You are YouTube's lead search algorithm analyst assigned to [TOPIC] content. With 72% of traffic coming from search, craft a description that dominates for [KEYWORD] while passing YouTube's EEAT (Experience, Expertise, Authority, Trustworthiness) checks. Required elements: 1) Keyword-rich opening paragraph (148-152 characters) that answers searcher intent without stuffing. 2) Three semantically related LSI keywords (e.g., "best [TOPIC] techniques" if primary is "[TOPIC] tutorial"). 3) Chapter markers formatted as 00:00 - Introduction for videos exceeding 8:47 runtime (optimal watch time threshold). 4) Two internal links to videos published in the last 90 days for session extension. Technical requirements: a) 4.5-5.5% keyword density measured by Yoast standards. b) Visual segmentation with Unicode dividers between sections. c) Three H2-style headline variants testing emotional vs. benefit-driven angles. d) Strategic link placement after the 30% scroll point. e) Hashtag cluster including one branded variant. Output as a side-by-side comparison highlighting added schema opportunities in yellow.