Fetch a YouTube video's transcript.

Args: url: YouTube video URL or video ID languages: Preferred languages in priority order (e.g. ["en", "de"]). Defaults to English. format: Output format — one of: text, json, pretty, webvtt, srt preserve_formatting: Keep HTML formatting tags in the transcript text include_timestamps: When True with format="text", prefix each line with [HH:MM:SS]. Ignored for json/srt/webvtt/pretty (those formats already include timestamps). include_metadata: When True (default), prepend a [METADATA] block (title, channel, published, duration, views, description) before the transcript. Pass False for transcript-only output.

Fetch a YouTube video's transcript and return it with summarization instructions.

The LLM client should use the returned instructions and transcript to produce a summary. The output is structured into clearly-labeled sections so a human can review the prompt before letting the LLM act on it.

Args: url: YouTube video URL or video ID prompt: Custom summarization instructions. If omitted, a default summary prompt is used. languages: Preferred languages in priority order (e.g. ["en", "de"]). Defaults to English. include_timestamps: When True, prefix each transcript line with [HH:MM:SS]. include_metadata: When True (default), include a [VIDEO] block with title, channel, published date, duration, views, and description.

Fetch metadata (title, description, channel, upload date, duration, views, chapters, etc.) for a YouTube video.

Args: url: YouTube video URL or video ID

List the videos in a YouTube playlist (titles, IDs, channels, durations, views).

Per-video metadata is intentionally lean so the call stays fast even for big playlists. For full metadata on a specific video, call get_video_metadata with that video's ID.

Args: url: YouTube playlist URL (with ?list=...) or bare playlist ID limit: Maximum videos to return (default 500). Pass a smaller value to truncate. sort_by: Sort key — "index" (playlist order, default), "title", "duration", "views". "upload_date" is not supported in this fast-mode tool. order: "asc" (default) or "desc".

List available transcript languages for a YouTube video.

Args: url: YouTube video URL or video ID