Skill Compose is an open-source platform for building and running AI agents that use modular skills. It is intended for creating skill-powered agents without workflow graphs or a command-line interface, and the catalogue skills are examples of those agent capabilities.
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 dp-archive/archive --skill media-downloadergit clone --depth 1 https://github.com/dp-archive/archiveWrote 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/dp-archive/archive/media-downloader)<a href="https://agentmods.dev/skills/dp-archive/archive/media-downloader"><img src="https://agentmods.dev/badge/skills/dp-archive/archive/media-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/dp-archive/archive/media-downloader"><img src="https://agentmods.dev/badge/skills/dp-archive/archive/media-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 | $0.00112 | $0.01630 |
| Opus 5 | $0.00056 | $0.00815 |
| Sonnet 5 | $0.00022 | $0.00326 |
| Haiku 4.5 | $0.00011 | $0.00163 |
Grade A, and why
media-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 11d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- media-downloader — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Media Downloader
Download video/audio from 1500+ websites using yt-dlp. Supports format selection, subtitles, playlists, and custom output naming.
Quick Start
# Basic download (best quality)
yt-dlp "URL"
# Specific resolution
yt-dlp -f "bestvideo[height<=1080]+bestaudio/best[height<=1080]" "URL"
# With subtitles
yt-dlp --write-subs --sub-langs "en,zh" "URL"
# Audio only
yt-dlp -f "bestaudio" "URL"
Format Selection
Resolution Presets
| Request | Command |
|---|---|
| Best quality | -f "bestvideo+bestaudio/best" |
| 4K | -f "bestvideo[height<=2160]+bestaudio/best" |
| 1080p | -f "bestvideo[height<=1080]+bestaudio/best" |
| 720p | -f "bestvideo[height<=720]+bestaudio/best" |
| 480p | -f "bestvideo[height<=480]+bestaudio/best" |
List Available Formats
yt-dlp -F "URL" # Show all formats with codes
Advanced Format Selection
# Prefer MP4 container
yt-dlp -f "bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best" "URL"
# Specific format code (from -F output)
yt-dlp -f 137+140 "URL"
# Merge to specific container
yt-dlp --merge-output-format mkv "URL"
Subtitles
Download Subtitles
# Manual subtitles (human-created)
yt-dlp --write-subs --sub-langs "en,zh,ja" "URL"
# Auto-generated subtitles
yt-dlp --write-auto-subs --sub-langs "en" "URL"
# Both manual and auto
yt-dlp --write-subs --write-auto-subs --sub-langs "en,zh" "URL"
# Embed subtitles in video (MP4/MKV/WebM)
yt-dlp --write-subs --embed-subs "URL"
List Available Subtitles
yt-dlp --list-subs "URL"
Subtitle Format
# Convert to SRT
yt-dlp --write-subs --sub-format srt "URL"
# Available: srt, ass, vtt, lrc
Output Naming
Template Variables
| Variable | Description | Example |
|---|---|---|
%(title)s |
Video title | My Video |
%(id)s |
Video ID | dQw4w9WgXcQ |
%(ext)s |
File extension | mp4 |
%(upload_date)s |
Upload date | 20231215 |
%(uploader)s |
Channel name | Rick Astley |
%(playlist)s |
Playlist name | Best Songs |
%(playlist_index)s |
Position in playlist | 01 |
%(resolution)s |
Video resolution | 1920x1080 |
What ships with it
1 file 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.
- 11d ago First seen · 223 lines · 112 tokens per session scan A e6b951b56366
media-downloader is a skill published in the GitHub repository dp-archive/archive (1,107 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 112 tokens to every session and 1,630 once invoked, about $0.0006 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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