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 besoeasy/open-skills --skill using-youtube-downloadgit clone --depth 1 https://github.com/besoeasy/open-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/besoeasy/open-skills/using-youtube-download)<a href="https://agentmods.dev/skills/besoeasy/open-skills/using-youtube-download"><img src="https://agentmods.dev/badge/skills/besoeasy/open-skills/using-youtube-download/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/besoeasy/open-skills/using-youtube-download"><img src="https://agentmods.dev/badge/skills/besoeasy/open-skills/using-youtube-download.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, 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 Tool Misuse · line 19 Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.Fix: Limit tool chaining depth and validate the output of each tool before passing it to the next. Require explicit user approval for multi-step chains.
- medium Privilege Escalation · line 19 Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.Fix: Avoid sudo/root unless strictly required. Prefer least-privilege patterns. If elevation is needed, document the justification and scope.
- medium Privilege Escalation · line 22 Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.Fix: Avoid sudo/root unless strictly required. Prefer least-privilege patterns. If elevation is needed, document the justification and scope.
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 | $0.00023 | $0.00999 |
| Opus 5 | $0.00012 | $0.00500 |
| Sonnet 5 | $0.00005 | $0.00200 |
| Haiku 4.5 | $0.00002 | $0.00100 |
Grade B, and why
using-youtube-download scanned grade B with 2 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o /usr/local/bin/yt-dlp && sudo chmod a+rx /usr/local/bin/yt-dlp Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
sudo curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o /usr/local/bin/yt-dlp && sudo chmod a+rx /usr/local/bin/yt-dlp How it starts
The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.
YouTube Download Skill
Teach how to download YouTube videos as video files and MP3 audio, defaulting to highest quality.
Prerequisites
yt-dlp(recommended fork of youtube-dl): https://github.com/yt-dlp/yt-dlpffmpeg(for merging/conversion)
Install (Linux/macOS):
python3 -m pip install -U yt-dlp
# or
sudo curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o /usr/local/bin/yt-dlp && sudo chmod a+rx /usr/local/bin/yt-dlp
# ffmpeg
sudo apt install ffmpeg # Debian/Ubuntu
brew install ffmpeg # macOS (Homebrew)
Windows: use the yt-dlp.exe release and install ffmpeg for Windows.
Download highest-quality video (merged MP4)
This downloads the best video and best audio and merges them into an MP4 (default highest quality).
yt-dlp -f "bestvideo+bestaudio/best" --merge-output-format mp4 -o "%(title)s.%(ext)s" <VIDEO_URL>
Notes:
-f "bestvideo+bestaudio/best"prefers separate best video and audio streams and falls back to the single best format.--merge-output-format mp4ensures a widely compatible container.- Output template
%(title)s.%(ext)snames the file by video title.
To force a max resolution (e.g., 1080p):
yt-dlp -f "bestvideo[height<=1080]+bestaudio/best" --merge-output-format mp4 -o "%(title)s.%(ext)s" <VIDEO_URL>
Download as MP3 (highest audio quality)
Extract and convert the best available audio to MP3 (highest quality):
yt-dlp -x --audio-format mp3 --audio-quality 0 -o "%(title)s.%(ext)s" <VIDEO_URL>
Options:
-x/--extract-audioextracts audio.--audio-format mp3converts to MP3.--audio-quality 0tells ffmpeg to use best VBR quality.
If you prefer 320kbps constant bitrate MP3:
yt-dlp -x --audio-format mp3 --postprocessor-args "-b:a 320k" -o "%(title)s.%(ext)s" <VIDEO_URL>
Download a playlist
Download an entire playlist (preserve order):
yt-dlp -f "bestvideo+bestaudio/best" --merge-output-format mp4 -o "%(playlist_index)s - %(title)s.%(ext)s" <PLAYLIST_URL>
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 · 123 lines · 23 tokens per session scan B 85b424e98967
using-youtube-download is a skill published in the GitHub repository besoeasy/open-skills (132 stars, last pushed 7d ago), licensed MIT. It adds 23 tokens to every session and 999 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 2 findings (asks for root, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
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powerpoint
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sherpa-onnx-tts
Local text-to-speech via sherpa-onnx (offline, no cloud).
sag
ElevenLabs text-to-speech with mac-style say UX.
video-frames
Extract frames or short clips from videos using ffmpeg.
ax-java-audio
Use when writing Java code with dev.axllm:ax for audio input/output, OpenAI Responses audio mapping, realtime event folding, and generated package audio examples.