Your landing page says "streamline your workflow with intelligent automation." Your customer, describing the same problem to a friend, says "I spend every Friday copying numbers between three tools and I want to die." One of these phrasings converts; you paid an agency for the other one.

Voice-of-customer copy is the oldest law in marketing — write in the words buyers use, not the words vendors invent — and the reason everyone breaks it is supply: getting real customer phrasing means interviews, surveys, review-mining. Meanwhile people describe their problems on camera constantly: review videos, day-in-the-life vlogs, "how I finally fixed X" tutorials. The phrasing goldmine is public and spoken; it just needs mining.

deep_search finds where your buyers talk: reviews of your category, workflow vlogs, complaint-driven tutorials — transcript-level search, so "videos where people describe struggling with <problem>" actually returns those moments, evidence-timestamped.

library_import_youtube_video and get_youtube_transcript extract the ore: import the richest videos and pull the verbatim passages where real users describe the pain, the workaround and what "fixed" feels like — in the exact vocabulary your headlines should be wearing. The phrasing file that comes out (frustration verbs, before/after language, the words they don't use — usually your feature names) is the cheapest conversion-rate work you'll do this quarter.