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FF meowmusic-youtube-mp3

Package and reuse the MeowMusicServer-patched YouTube fallback workflow: Windows Chrome cookie export/sync to server, server-side yt-dlp/yt-dlp-ejs/ffmpeg setup, old-source-first with YouTube fallback, and MV-to-MP3 extraction/caching. Use when Claude needs to wire YouTube audio acquisition into MeowMusicServer or a similar music service, debug YouTube download failures, refresh cookies from a Windows Chrome profile, or implement a local-cache MP3 flow from YouTube videos.

Blockedguard blocked the skill: signs of malicious behaviour
ClawHub Agent Skills author: joe12801 v0.1.0 MIT-0 8 files · 1 script body ≈ 1 022 tokens Open the sourceclawhub.ai↗ analyzed 3 d ago

As a process F 43/100 · Will not run — References files that are not bundled: scripts/windows/sync_cookie.bat, scripts/windows/open_youtube.bat

ProcedureYouTubeMedia and videotype and topics are labelled automatically from the skill text
Runs in: OpenClaw Claude / Claude Code ChatGPT / Codex Gemini CLI Cursor GitHub Copilot / VS Code Qwen Code Kimi Code CLI Z.ai (GLM) DeepSeek (Deep Code) Mistral Vibe LangChain (deepagents) Goose OpenCode
JSON
Technical rating
F
38/100
safety, quality, tests
Safety 60%
9
Quality 40%
82
Run on models
none yet
Process rating
F
43/100
Will not run
References files that are not bundled: scripts/windows/sync_cookie.bat, scripts/windows/open_youtube.bat
Tools and files w 18
0
Result and completion w 14
0
Inputs and preconditions w 11
0
the three weakest of ten parameters · all ten
Guard blocked this skill: critical findings below. Do not install it until the author fixes them.

What is at stake

The skill contains fragments that, in the wrong hands, cost money or data. Below: what the installer risks and what the author should do.

Exfiltration
If you install

The instructions or scripts send data out: environment variables, keys, file contents, chat history. You may never notice, because the agent performs the upload as "part of the task".

For the author

If the upload is not needed for the task, remove it: catalogs flag such skills and delist them. If it is needed, name the destination explicitly, say what leaves the machine, and give the user a switch.

How to improve

  1. Remove the critical guard findings (secrets, dangerous commands, hidden instructions): while they stand the skill is blocked and cannot grade above F.
  2. The text references files that are not there: add them or drop the references.
For the model run — optional
  • Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
  • A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.

Guard findings · 5

  • critical Exfiltration exfil-send-secrets-to-url references/cookie-api-and-sync.md:62
    Instruction to send secrets/history to an external endpoint
    3. POST cookie text to the server API.
  • high Exfiltration intent-browser-credential-store references/cookie-api-and-sync.md:60
    Accesses a browser credential / cookie store
    1. Export cookies from Chrome/Edge/Firefox with `yt-dlp --cookies-from-browser`.
  • high Exfiltration intent-browser-credential-store SKILL.md:45
    Accesses a browser credential / cookie store
    On Windows, export cookies from Chrome with:
Medium and low: 2
  • medium Exfiltration intent-browser-credential-store SKILL.md:3
    Accesses a browser credential / cookie store (quoted — discussed, not commanded)
    description: "Package and reuse the MeowMusicServer-patched YouTube fallback workflow: Windows Chrome cookie export/sync to server, server-side yt-dlp/yt-dlp-ejs/ffmpeg setup, old-source-first with Yo
    quoted
  • medium Exfiltration intent-browser-credential-store SKILL.md:48
    Accesses a browser credential / cookie store (the skill's own vendor host)
    yt-dlp --cookies-from-browser chrome:Default --cookies youtube-cookies.txt --skip-download https://www.youtube.com/watch?v=…
    vendor-host

Files scanned: 8. Evidence is masked. Grey chips explain why severity was lowered.

Against the Agent Skills spec

  • warning missing-ref reference to a missing file: scripts/windows/sync_cookie.bat
  • warning missing-ref reference to a missing file: scripts/windows/open_youtube.bat

Process rating: all ten parameters 43/100

Will not run. References files that are not bundled: scripts/windows/sync_cookie.bat, scripts/windows/open_youtube.bat
  • 0Tools and files. 2 referenced file(s) missing: scripts/windows/sync_cookie.bat, scripts/windows/open_youtube.bat
  • 0Result and completion. Does not say what the result is
  • 0Inputs and preconditions. Does not say what the process needs to start
  • 0Progress reporting. Says nothing while it works
  • 20When it triggers. No condition that starts the skill
  • 30Running it twice. 1 mutating operations with no state check
  • 100Steps. 44 steps
  • 100Failures and branches. 5 branches, has a failure section
  • 100Consistency. Name and required fields are in place
  • 100Execution cost. Instruction body is 1022 tokens

Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.

Quality signals

  • +5Description has no quoted example phrases that should trigger the skill
  • +4Description does not say when NOT to use the skill (false activations)
  • +3Output format is not stated: the model decides each time
  • +1No license
  • +2Single-language instructions
  • +3Description length 477: enough signal without eating the budget
  • +4Structure: 9 headings
  • +3Step-by-step instructions: 44 items
  • +4Has examples (1 code blocks)
  • +4Reference files are cited in the instructions (3 of 4)
  • +3All 2 scripts are documented

Quality base 70; lint remarks subtract, signals add up to 100. Result: 82.

External checks

ClawHub: suspicious
This skill is coherent for MeowMusic YouTube fallback work, but it moves browser cookies to a server and changes system packages without enough safety controls.
LLM: suspicious (high) · VirusTotal: · 29 May 2026