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 CraftOS-dev/CraftBot --skill universal-video-downloadergit clone --depth 1 https://github.com/CraftOS-dev/CraftBotWrote 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/craftos-dev/craftbot/universal-video-downloader)<a href="https://agentmods.dev/skills/craftos-dev/craftbot/universal-video-downloader"><img src="https://agentmods.dev/badge/skills/craftos-dev/craftbot/universal-video-downloader.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00056 | $0.00433 |
| Opus 5 | $0.00028 | $0.00217 |
| Sonnet 5 | $0.00011 | $0.00087 |
| Haiku 4.5 | $0.00006 | $0.00043 |
Grade A, and why
universal-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 4d 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.
What it actually says
Universal Video Downloader
Download videos from almost any platform using the powerful yt-dlp tool.
Features
- Platform Support: YouTube, Instagram, TikTok, Twitter/X, Facebook, and many more.
- Quality Selection: Choose from 144p up to 4K/8K resolutions.
- Automatic Cleanup: Files are deleted from the server immediately after successful upload to the chat.
- Smart Merging: Automatically merges high-quality video and audio streams into a single MP4 file.
Workflow
- Trigger: User sends a video link (e.g., YouTube, Instagram).
- Information Gathering: The agent uses
scripts/download.py infoto fetch available qualities and the video title. - User Choice: The agent presents resolutions to the user and asks which one they prefer.
- Download: Once selected, the agent runs
scripts/download.py downloadwith the specific Format ID. - Delivery: The agent sends the resulting file using the
messagetool withfilePath. - Cleanup: The agent must delete the file from disk using
rmimmediately after the message is successfully sent to save disk space.
Usage for Agents
1. Fetch Video Info
python3 scripts/download.py info "URL"
2. Download Specific Format
python3 scripts/download.py download "URL" "FORMAT_ID"
Safety & Storage
- This skill is intended for temporary processing.
- CRITICAL: Always delete the downloaded file after the user receives it to maintain disk space.
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.
- 4d ago First seen · 40 lines · 56 tokens per session scan A 95197d0c77bf
universal-video-downloader is a skill published in the GitHub repository CraftOS-dev/CraftBot (380 stars, last pushed yesterday), licensed MIT. It adds 56 tokens to every session and 433 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 2026-09-03.
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