youtube-downloader
Download YouTube videos and HLS streams (m3u8) from platforms like Mux, Vimeo, etc. using yt-dlp and ffmpeg. Use this skill when users request downloading videos, extracting audio, handling protected streams with authentication headers, or troubleshooting download issues like nsig extraction failures, 403 errors, or cookie extraction problems.
84
81%
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
Advisory
Suggest reviewing before use
Security
2 findings — 2 medium severity. This skill can be installed but you should review these findings before use.
W011: Third-party content exposure detected (indirect prompt injection risk)
What this means
The skill exposes the agent to untrusted, user-generated content from public third-party sources, creating a risk of indirect prompt injection. This includes browsing arbitrary URLs, reading social media posts or forum comments, and analyzing content from unknown websites.
Why it was flagged
Third-party content exposure detected (high risk: 1.00). The skill explicitly fetches and ingests content from public third‑party sources (YouTube, Mux, Vimeo, arbitrary video/m3u8 URLs)—see SKILL.md "Default flow: Fetch video metadata ... Always render the thumbnail" and scripts/download_video.py (fetch_oembed_info via urlopen and extensive yt-dlp downloads/retries)—and the agent reads that untrusted, user-generated content and uses it to decide actions (choose download flows, retry logic, start PO token providers, request cookies), so third‑party content can materially influence tool use.
W012: Unverifiable external dependency detected (runtime URL that controls agent)
What this means
The skill fetches instructions or code from an external URL at runtime, and the fetched content directly controls the agent’s prompts or executes code. This dynamic dependency allows the external source to modify the agent’s behavior without any changes to the skill itself.
Why it was flagged
Potentially malicious external URL detected (high risk: 0.90). The skill's runtime will fetch and execute remote code: it runs pip installs using the PYPI mirror https://pypi.tuna.tsinghua.edu.cn/simple and pulls/executes the Docker image brainicism/bgutil-ytdlp-pot-provider (docker run), which are required for the PO Token provider used by the downloader.
- Repository
- daymade/claude-code-skills
- Commit
80e94fd
- Audited
- Security analysis
Is this your skill?
If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.