Claude Code Skills Marketplace is a collection and marketplace of skills, plugins, agents, and instructions that extend Claude Code with specialized development workflows. It is for developers who want to install existing workflows or create, validate, and package their own Claude Code skills.
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 daymade/claude-code-skills --skill youtube-downloadergit clone --depth 1 https://github.com/daymade/claude-code-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/daymade/claude-code-skills/youtube-downloader)<a href="https://agentmods.dev/skills/daymade/claude-code-skills/youtube-downloader"><img src="https://agentmods.dev/badge/skills/daymade/claude-code-skills/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/daymade/claude-code-skills/youtube-downloader"><img src="https://agentmods.dev/badge/skills/daymade/claude-code-skills/youtube-downloader.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector warn
SkillSpector: 2 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 YARA Match · line 44 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.
- medium Excessive Agency · line 326 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 | $0.00074 | $0.04752 |
| Opus 5 | $0.00037 | $0.02376 |
| Sonnet 5 | $0.00015 | $0.00950 |
| Haiku 4.5 | $0.00007 | $0.00475 |
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 5d 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 — 510 lines — stays where its author put it; the contents beside it link to each section on GitHub.
YouTube Downloader
Overview
Enable reliable video and audio downloads from YouTube and HLS streaming platforms (Mux, Vimeo, etc.) using yt-dlp and ffmpeg. This skill provides workflows for:
- YouTube downloads (up to 4K) using PO token providers or browser cookies
- HLS stream downloads with authentication headers
- Handling protected content and troubleshooting common download failures
Non-Technical User Experience (Default)
Assume the user is non-technical. Do not ask them to run commands. Execute everything yourself and report progress in plain language. Avoid mentioning tooling unless the user asks.
Default flow:
- Ask for the URL (if not provided).
- Fetch video metadata (title/uploader/duration/thumbnail) and confirm it matches the user's intent.
- If yt-dlp is blocked by “confirm you’re not a bot”, fall back to YouTube oEmbed for title/uploader/thumbnail (duration may be unknown).
- Offer simple choices (video vs. audio-only, quality, subtitles, save location).
- Proceed with sensible defaults if the user does not specify:
- Video download at best quality
- MP4 merged output
- Single video only (no playlists)
- Download and report the final file path, file size, and resolution (if video).
Offer choices in user-friendly terms:
- “Download the video in best quality (default)”
- “Download audio only (MP3)”
- “Pick a quality: 1080p / 720p / 480p / 360p”
- “Include subtitles (if available)”
- “Save to the Downloads folder (default) or tell me another folder”
Always render the thumbnail when available:
- If metadata includes a thumbnail URL, include it using Markdown image syntax:
.
Ask before doing extra work:
- Confirm playlist downloads (can be large).
- Confirm installing/upgrading dependencies if missing.
- Ask before extracting browser cookies.
- If using cookies, never mention cookie counts or raw cookie details in user-facing responses. Say “used your Chrome login session”.
- If verification is required, automatically set up a local PO Token helper (no user actions). If Docker is missing or fails, do not attempt to install Docker—switch to the browser-based PO Token provider instead.
What ships with it
3 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.
- 5d ago Changed · +1 lines d75d90722029
- 7d ago First seen · 509 lines · 74 tokens per session scan A e67f1ff2eb48
youtube-downloader is a skill published in the GitHub repository daymade/claude-code-skills (1,385 stars, last pushed yesterday), licensed MIT. It adds 74 tokens to every session and 4,752 once invoked, about $0.0004 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 2026-09-03.
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