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.
87
88%
Does it follow best practices?
Impact
78%
1.59xAverage score across 3 eval scenarios
Risky
Do not use without reviewing
Quality
Discovery
100%Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.
This is an excellent skill description that hits all the marks. It provides specific capabilities (downloading, extracting, troubleshooting), names concrete tools and platforms, includes a comprehensive 'Use this skill when...' clause with natural trigger terms, and is distinctive enough to avoid conflicts with other skills. The inclusion of specific error types (nsig extraction failures, 403 errors, cookie extraction problems) is particularly valuable for routing troubleshooting requests.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions: 'Download YouTube videos', 'HLS streams (m3u8)', 'extracting audio', 'handling protected streams with authentication headers', 'troubleshooting download issues'. Also names specific tools (yt-dlp, ffmpeg) and platforms (Mux, Vimeo). | 3 / 3 |
Completeness | Clearly answers both what (download videos, extract audio, handle protected streams, troubleshoot issues) AND when with explicit 'Use this skill when...' clause listing specific trigger scenarios including error types. | 3 / 3 |
Trigger Term Quality | Excellent coverage of natural terms users would say: 'YouTube videos', 'HLS streams', 'm3u8', 'Mux', 'Vimeo', 'yt-dlp', 'ffmpeg', 'downloading videos', 'extracting audio', 'nsig extraction failures', '403 errors', 'cookie extraction'. These are terms users would naturally use when seeking help. | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive with clear niche: video downloading specifically via yt-dlp/ffmpeg, with platform-specific mentions (YouTube, Mux, Vimeo) and technical error types (nsig, 403, cookies). Unlikely to conflict with general media or file handling skills. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
77%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a comprehensive and highly actionable skill with excellent workflow clarity and concrete executable examples. The main weaknesses are verbosity (particularly in the non-technical user experience section and some redundant troubleshooting content) and the monolithic structure that could benefit from splitting detailed sections into reference files.
Suggestions
Move the detailed HLS stream section to a separate reference file (e.g., references/hls-downloads.md) and link to it from the main skill
Consolidate the troubleshooting sections - there's overlap between 'Troubleshooting Quick Reference' and error handling mentioned in the SOP/checklist
Trim the 'Non-Technical User Experience' section - Claude understands how to interact with users; focus on the specific choices and defaults rather than explaining interaction patterns
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill contains useful information but is verbose in places, with some redundancy between sections (e.g., troubleshooting items repeated, multiple explanations of PO token setup). The 'Non-Technical User Experience' section explains interaction patterns Claude should already understand. | 2 / 3 |
Actionability | Provides fully executable commands throughout with specific examples for yt-dlp, ffmpeg, and the bundled script. Commands are copy-paste ready with clear parameter explanations and concrete output expectations. | 3 / 3 |
Workflow Clarity | Multi-step processes are clearly sequenced with explicit validation checkpoints (verify installation, check formats, verify download quality). The SOP and Agent Execution Checklist provide clear error recovery paths and feedback loops for common failures. | 3 / 3 |
Progressive Disclosure | References external files appropriately (references/po-token-setup.md) but the main document is quite long with content that could be split out. The HLS section and troubleshooting could be separate reference files to keep the main skill leaner. | 2 / 3 |
Total | 10 / 12 Passed |
Validation
100%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 11 / 11 Passed
Validation for skill structure
No warnings or errors.
- Repository
- daymade/claude-code-skills
- Commit
392d34c
- Reviewed
Table of Contents
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