Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add isjiamu/jiamu-skills --skill video-downloadergit clone --depth 1 https://github.com/isjiamu/jiamu-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/isjiamu/jiamu-skills/video-downloader)<a href="https://agentmods.dev/skills/isjiamu/jiamu-skills/video-downloader"><img src="https://agentmods.dev/badge/skills/isjiamu/jiamu-skills/video-downloader/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/isjiamu/jiamu-skills/video-downloader"><img src="https://agentmods.dev/badge/skills/isjiamu/jiamu-skills/video-downloader.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high YARA Match · line 139 YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).Fix: Remove the malware payload or compromised file entirely. Investigate how it entered the skill and audit all other artifacts for additional indicators of compromise.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00058 | $0.01307 |
| Opus 5 | $0.00029 | $0.00654 |
| Sonnet 5 | $0.00012 | $0.00261 |
| Haiku 4.5 | $0.00006 | $0.00131 |
Grade A, and why
video-downloader scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 209 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Video Downloader
Overview
Download videos from YouTube, Bilibili, Twitter/X, TikTok, and 1000+ other websites using yt-dlp. Supports multiple quality options, audio extraction, and automatic format selection.
When to Use This Skill
Invoke this skill when users:
- Provide a video URL and want to download it
- Ask to download videos from any website
- Want to extract audio from online videos
- Need to download videos in specific quality (1080p, 4K, etc.)
- Request help with video download issues
Quick Start
When a user provides a video URL:
# Run the bundled download script
python3 scripts/download.py "VIDEO_URL"
Default output: ~/Downloads/Videos/
Prerequisites
Install yt-dlp
# macOS
brew install yt-dlp
# Cross-platform (pip)
pip install yt-dlp
# Update to latest version
brew upgrade yt-dlp # or: pip install --upgrade yt-dlp
Verify Installation
which yt-dlp && yt-dlp --version
Common Download Commands
Basic Download (Best Quality)
yt-dlp -P ~/Downloads/Videos "VIDEO_URL"
Specific Quality
# Best quality up to 1080p
yt-dlp -f "bestvideo[height<=1080]+bestaudio/best" -P ~/Downloads/Videos "VIDEO_URL"
# Best quality up to 720p
yt-dlp -f "bestvideo[height<=720]+bestaudio/best" -P ~/Downloads/Videos "VIDEO_URL"
# Best available (including 4K)
yt-dlp -f "bestvideo+bestaudio/best" -P ~/Downloads/Videos "VIDEO_URL"
Audio Only (MP3)
yt-dlp -x --audio-format mp3 -P ~/Downloads/Videos "VIDEO_URL"
List Available Formats
yt-dlp -F "VIDEO_URL"
Download with Subtitles
yt-dlp --write-subs --sub-lang zh,en -P ~/Downloads/Videos "VIDEO_URL"
Playlist Download
yt-dlp -P ~/Downloads/Videos "PLAYLIST_URL"
Bundled Script Reference
scripts/download.py
Convenience wrapper with sensible defaults:
# Basic usage
python3 scripts/download.py "VIDEO_URL"
# Options
python3 scripts/download.py "VIDEO_URL" -o ~/Desktop # Custom output
python3 scripts/download.py "VIDEO_URL" -f 1080 # Max 1080p
python3 scripts/download.py "VIDEO_URL" -a # Audio only (MP3)
python3 scripts/download.py "VIDEO_URL" -F # List formats
python3 scripts/download.py "VIDEO_URL" --subs # With subtitles
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 209 lines · 58 tokens per session scan A 9080e86d1842
video-downloader is a skill published in the GitHub repository isjiamu/jiamu-skills (134 stars, last pushed 2mo ago), licensed MIT. It adds 58 tokens to every session and 1,307 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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