Search YouTube for videos by keyword or phrase. Returns video IDs, titles, durations, channels, view counts, and URLs. Results sorted by relevance.

List videos from a YouTube playlist or channel. Returns video IDs, titles, durations, upload dates, and URLs. Sorted by playlist or channel order.

Get detailed metadata for a single YouTube video. Returns title, channel, duration, upload date, view count, like count, comment count, description, tags, and thumbnail URL.

Extract the full transcript from a YouTube video. Supports auto-generated and manual captions. Returns plain text with word count and detected language. Results are cached locally.

Extract chapter markers and timestamps from a YouTube video. Returns chapter titles with start and end times. Not all videos have chapters. Returns empty list if none found.

Get top comments from a YouTube video sorted by popularity. Returns author, text, like count, and pinned status. Only top-level comments, no replies.

Get metadata for a YouTube channel. Returns channel name, handle, subscriber count, description, and channel URL.

Search YouTube for channels by keyword or phrase. Returns channel names, handles, subscriber counts, descriptions, and URLs.

Get metadata for a YouTube playlist. Returns title, channel, video count, last updated date, and description.

List all available download formats for a YouTube video. Returns format IDs, extensions, resolutions, FPS, codecs, and file sizes. Grouped by video+audio, video-only, and audio-only.

Save a summary or skill note to the local YouTube knowledge library. Overwrites existing content of the same type for the same video. Returns the saved file path.

List all saved items in the local YouTube knowledge library. Returns titles, channels, content types, tags, and save dates. Optionally filter by tag. Sorted by most recently saved.

Download a YouTube video to local disk. Use the quality parameter for automatic format selection with smart fallbacks, or formatId for a specific format from list_formats. Returns the downloaded file path, title, and format details.