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 aviz85/claude-skills-library --skill youtube-downloadergit clone --depth 1 https://github.com/aviz85/claude-skills-libraryWrote 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/aviz85/claude-skills-library/youtube-downloader)<a href="https://agentmods.dev/skills/aviz85/claude-skills-library/youtube-downloader"><img src="https://agentmods.dev/badge/skills/aviz85/claude-skills-library/youtube-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/aviz85/claude-skills-library/youtube-downloader"><img src="https://agentmods.dev/badge/skills/aviz85/claude-skills-library/youtube-downloader.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00032 | $0.00703 |
| Opus 5.5 | $0.00013 | $0.00281 |
| Sonnet 5.5 | $0.00006 | $0.00141 |
| Haiku 4.5 | $0.00003 | $0.00070 |
Grade A, and why
youtube-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 1mo 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 1mo ago First seen · 92 lines · 32 tokens per session scan A 655086c9d8f9
youtube-downloader is a skill published in the GitHub repository aviz85/claude-skills-library (50 stars, last pushed 3mo ago), with no licence file. It adds 32 tokens to every session and 703 once invoked, about $0.0001 per session on Opus 5.5. 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.
Other skills, from other repositories
media-download
Download video (or audio) from YouTube, Rumble, and other yt-dlp-supported sites via the media-downloader MCP server, and natively store the downloaded media into the epistemic-graph knowledge graph as a content-addressed blob + :MediaAsset. Use when the agent must fetch a video by URL and optionally persist the raw…
youtube
Use whenever the user mentions YouTube, video uploads, channel management, playlists, video SEO, or any YouTube Data API operation. Manages videos, playlists, comments, captions, subscriptions, thumbnails, analytics, and more.
image-zoom-360
Boost product confidence with high-res image zoom, 360-degree spin views, and inline video so shoppers can examine products closely before buying.
media-expert
Expert-level media production, content management, streaming, broadcasting, and media technology systems. Use when the user mentions video, streaming, broadcast, CMS, or production, or when the task involves Media Production, Streaming and Broadcasting, Technologies, or Standards and Protocols.
video-to-skill
Turn a video, tutorial, playlist, or course into an installed, evidence-grounded course Skill that can teach, give practice and feedback, apply demonstrated methods, and answer reference questions. Use when the user provides video sources and wants reusable learning or operational capability.
faceless-youtube
Use when creating and automating faceless YouTube channels using AI-generated scripts, TTS voiceovers, stock footage, and automated publishing workflows with zero on-camera presence.