Video downloader

Skill bcastelino/agent-skills-kit/skills/video-downloader

Download YouTube videos with customizable quality and format options. Use when the user asks to download, save, or grab YouTube videos. Supports various quality settings (best, 1080p, 720p, 480p, 360p), multiple formats (mp4, webm, mkv), and audio-only downloads as MP3.From its SKILL.md

Install

npx -y skills add bcastelino/agent-skills-kit --skill video-downloader

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

One thing to look at

2 stars2 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

SKILL.md

2.6 KB, 610 tokens by cl100k_base, as published. Nobody here has run it

YouTube Video Downloader

Download YouTube videos with full control over quality and format settings.

Quick Start

The simplest way to download a video:

python scripts/download_video.py "https://www.youtube.com/watch?v=VIDEO_ID"

This downloads the video in best available quality as MP4 to /mnt/user-data/outputs/.

Options

Quality Settings

Use -q or --quality to specify video quality:

best (default): Highest quality available
1080p: Full HD
720p: HD
480p: Standard definition
360p: Lower quality
worst: Lowest quality available

Example:

python scripts/download_video.py "URL" -q 720p

Format Options

Use -f or --format to specify output format (video downloads only):

mp4 (default): Most compatible
webm: Modern format
mkv: Matroska container

Example:

python scripts/download_video.py "URL" -f webm

Audio Only

Use -a or --audio-only to download only audio as MP3:

python scripts/download_video.py "URL" -a

Custom Output Directory

Use -o or --output to specify a different output directory:

python scripts/download_video.py "URL" -o /path/to/directory

Complete Examples

Download video in 1080p as MP4:

python scripts/download_video.py "https://www.youtube.com/watch?v=dQw4w9WgXcQ" -q 1080p

Download audio only as MP3:

python scripts/download_video.py "https://www.youtube.com/watch?v=dQw4w9WgXcQ" -a

Download in 720p as WebM to custom directory:

python scripts/download_video.py "https://www.youtube.com/watch?v=dQw4w9WgXcQ" -q 720p -f webm -o /custom/path

How It Works

The skill uses yt-dlp, a robust YouTube downloader that:

Automatically installs itself if not present
Fetches video information before downloading
Selects the best available streams matching your criteria
Merges video and audio streams when needed
Supports a wide range of YouTube video formats

Important Notes

Downloads are saved to /mnt/user-data/outputs/ by default
Video filename is automatically generated from the video title
The script handles installation of yt-dlp automatically
Only single videos are downloaded (playlists are skipped by default)
Higher quality videos may take longer to download and use more disk space

What ships with it: 1 file

4.2 KB alongside SKILL.md, 1 of them executable

scripts/

download_video.pyruns4.2 KB

Gives 0 of the 12 instructions most video audio skills give in 610 tokens

Counted across 619 of the 725 authors here whose files we hold, read 2026-09-06

Read product marketing context firstin 13 of 619, across 7 files
Define the core visual thesis in one sentencein 11 of 619, across 3 files
Break the concept into 3 to 6 scenesin 11 of 619, across 3 files
Render the smallest working version firstin 11 of 619, across 3 files
Start with a low-quality smoke test renderin 11 of 619, across 3 files
Add captions for accessibility and engagementin 11 of 619, across 5 files
Write the scene outline before writing codein 11 of 619, across 3 files
Specify subject, action, camera, style, and moodin 11 of 619, across 5 files
Decide what each scene provesin 10 of 619, across 2 files
Export one clean thumbnail framein 10 of 619, across 2 files
Pick the right tool for the jobin 10 of 619, across 4 files
Run the test suite before proposing a fixin 8 of 619, across 7 files

Said here and by no other author read

Specify video quality using the quality flag
Specify output format using the format flag
Download audio only using the audio flag

Grouped from the skills themselves: near-identical wordings counted once, and counted by distinct author, so one author publishing three of these counts once. Length counted with cl100k_base; the agent that loads this file may tokenize it differently.