BC download-anything
Find and download virtually any digital resource from the internet — ebooks, academic papers, movies, TV shows, music, software, images, fonts, courses, and more. Covers both English and Chinese internet ecosystems. Includes CLI tool workflows (yt-dlp, aria2, gallery-dl, spotdl), resource site directories, cloud drive search engines (百度/阿里/夸克网盘搜索), and search techniques (Google dorks). Use when the user wants to: (1) download a video, audio, or media from a URL, (2) find and download an ebook or academic paper, (3) find and download software, (4) search for any digital resource, (5) batch download images or media from a gallery/site, (6) download torrents or magnet links, (7) find free stock assets (images, video, audio, fonts), (8) search Chinese cloud drives for resources, or (9) any task involving finding or downloading digital content from the internet.
As a process C 50/100 · Has gaps — weak spots: result and completion, inputs and preconditions, failures and branches
What is at stake
Medium-severity findings: the skill is probably honest, but read what alarmed the scanner.
Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.
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".
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
- 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 · 7
✓ No critical or high findings
Medium and low: 7
-
medium Exfiltration
intent-browser-credential-storereferences/education.md:68Accesses a browser credential / cookie store (documentation of a security skill)yt-dlp --cookies-from-browser chrome "URL"
security skill -
medium Exfiltration
intent-browser-credential-storereferences/tools-reference.md:79Accesses a browser credential / cookie store (documentation of a security skill)yt-dlp --cookies-from-browser chrome "URL"
security skill -
medium Exfiltration
intent-browser-credential-storereferences/video.md:98Accesses a browser credential / cookie store (documentation of a security skill)yt-dlp --cookies-from-browser chrome "https://www.bilibili.com/video/BV..."
security skill -
medium Exfiltration
intent-browser-credential-storescripts/dl-video.sh:39Accesses a browser credential / cookie store (detector / deny-list definition)echo "⚠ Bilibili requires login cookies. Log in via Chrome/Firefox first." >&2
detector -
low Exfiltration
intent-browser-credential-storescripts/dl-video.sh:31Accesses a browser credential / cookie store (negated — the text forbids it)# Bilibili returns HTTP 412 without cookies. Try Chrome first, then Firefox.
negated
A further 2 matches are quotations in this security skill's documentation and are not counted as findings.
Files scanned: 18. Evidence is masked. Grey chips explain why severity was lowered.
Against the Agent Skills spec
✓ No remarks against the Agent Skills spec
Process rating: all ten parameters 50/100
- 0Result and completion. Does not say what the result is
- 0Inputs and preconditions. Does not say what the process needs to start
- 0Failures and branches. Linear process with no failure handling
- 0Progress reporting. Says nothing while it works
- 60Tools and files. Uses tools (web) that frontmatter does not declare
- 70When it triggers. States when to use, but not when not to
- 85Steps. 4 steps, 1 vague phrases
- 100Consistency. Name and required fields are in place
- 100Execution cost. Instruction body is 1245 tokens
- 100Running it twice. No mutating operations
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)
- +3Description length 869: 120–800 characters recommended
- +3Output format is not stated: the model decides each time
- +1No license
- +2Single-language instructions
- +4Structure: 8 headings
- +3Step-by-step instructions: 4 items
- +4Has examples (2 code blocks)
- +4Reference files are cited in the instructions (9 of 9)
- +3All 7 scripts are documented
Quality base 70; lint remarks subtract, signals add up to 100. Result: 88.