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.
67
81%
Does it follow best practices?
Impact
—
No eval scenarios have been run
Risky
Do not use without reviewing
Security
3 findings — 1 high severity, 2 medium severity. You should review these findings carefully before considering using this skill.
W007: Insecure credential handling detected in skill instructions
What this means
The skill handles credentials insecurely by requiring the agent to include secret values verbatim in its generated output. This exposes credentials in the agent’s context and conversation history, creating a risk of data exfiltration.
Why it was flagged
Insecure credential handling detected (high risk: 1.00). The skill instructs extracting browser cookies and copying authentication headers from DevTools into yt-dlp/ffmpeg commands (or passing cookie files/--cookies-from-browser), which requires embedding sensitive cookies/auth tokens verbatim in commands/requests and thus risks secret exfiltration.
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 performs runtime installation and execution of remote code: it runs pip install against the PYPI mirror (https://pypi.tuna.tsinghua.edu.cn/simple) to install providers (e.g., bgutil-ytdlp-pot-provider / yt-dlp-getpot-wpc) and may docker run the remote image brainicism/bgutil-ytdlp-pot-provider, both of which fetch and execute external code that the skill relies on for PO Token functionality.
W013: Attempt to modify system services in skill instructions
What this means
The skill prompts the agent to compromise the security or integrity of the user’s machine by modifying system-level services or configurations, such as obtaining elevated privileges, altering startup scripts, or changing system-wide settings.
Why it was flagged
Attempt to modify system services in skill instructions detected (low risk: 0.30). The skill directs the agent to run host commands, install packages/plugins, start Docker-based services and extract browser cookies (modifying machine state and accessing sensitive data) but it does not request sudo, modify system files that require elevated privileges, or create user accounts.
- Repository
- daymade/claude-code-skills
- Commit
0f104ea
- 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.