Search YouTube for videos (no API key). Returns id, title, channel, published, views, duration, snippet per hit. Use filters to narrow: uploadDate for recency, sortBy view_count to find what performs.

Full metadata + engagement for one video: title, channel, publish date, views, likes, likesPer1kViews (resonance signal, typical range 10-50), category, keywords, description, hasCaptions.

Fetch a video's transcript as clean plain text. Resilient: tries InnerTube, then the timedtext caption track, then local yt-dlp if installed. Long transcripts are chunked — check totalChars and call again with offsetChars to continue.

Batch transcript fetch (max 10 videos, 3 at a time). Per-video failures don't kill the batch — failed entries carry an error field. Each transcript is truncated to fit; use get_transcript with offsetChars for full text of long ones.

Channel metadata (name, subscribers, description) plus its recent uploads with views — enough to read a channel's strategy, cadence, and what performs.

YouTube's autocomplete for a seed term — a direct read on real search demand. Use for keyword research: seed a niche term, get what people actually type. Chain suggestions of suggestions to map a topic space.