Read what is said in a YouTube video, as plain text.

You get the whole thing by default. On a long video, narrow it with start_seconds and end_seconds so the response stays small. A caption line that straddles either edge of that window comes back whole rather than cut in half.

English is preferred, then a handful of widely spoken languages, and failing all of those whatever the video actually has. Check the language field on the way out and translate if you need to. The auto_generated field tells you whether a human wrote the captions or speech recognition did, which is worth knowing before you quote them.

The text has no timestamps in it. Shorts are not supported. If you only need the title, length or view count, youtube_video_facts is much cheaper.

List the videos in a YouTube playlist, in playlist order.

Returns watch URLs and the playlist title, nothing about the videos themselves. Use it to unpack a playlist, then call youtube_video_facts or youtube_transcript on the URLs you get back. A watch link that happens to be playing inside a playlist works here too.

Look up a YouTube video without reading its captions.

Gives you the title, channel, duration, publish date, view and like counts, the description, and which caption languages exist. Far cheaper than pulling a transcript, so start here when the question is about the video rather than its contents, or to check a video has captions before asking for them.