Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add nikhilbhansali/youtube-data-skills --skill youtube-thumbnail-analyzergit clone --depth 1 https://github.com/nikhilbhansali/youtube-data-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/nikhilbhansali/youtube-data-skills/youtube-thumbnail-analyzer)<a href="https://agentmods.dev/skills/nikhilbhansali/youtube-data-skills/youtube-thumbnail-analyzer"><img src="https://agentmods.dev/badge/skills/nikhilbhansali/youtube-data-skills/youtube-thumbnail-analyzer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nikhilbhansali/youtube-data-skills/youtube-thumbnail-analyzer"><img src="https://agentmods.dev/badge/skills/nikhilbhansali/youtube-data-skills/youtube-thumbnail-analyzer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00133 | $0.01588 |
| Opus 5 | $0.00067 | $0.00794 |
| Sonnet 5 | $0.00027 | $0.00318 |
| Haiku 4.5 | $0.00013 | $0.00159 |
Grade A, and why
youtube-thumbnail-analyzer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 180 lines — stays where its author put it; the contents beside it link to each section on GitHub.
YouTube Thumbnail Analyzer
Download and visually analyze thumbnails from top-performing YouTube videos for any topic or channel.
Usage
/youtube-thumbnail-analyzer "air fryer recipes"
/youtube-thumbnail-analyzer @ChannelHandle
/youtube-thumbnail-analyzer --topic "Python tutorial" --max 20
/youtube-thumbnail-analyzer @ChannelHandle --top 15
Instructions
Step 1: Parse Arguments
Input mode (one of):
- Topic/keyword: search YouTube for top videos on this topic
- Channel (
@handle, URL, or ID): use this channel's top videos
Also:
- --max N (optional): number of thumbnails to download (default: 20, max: 50)
- --scan-limit N (optional, channel mode): cap uploads scanned (default: whole channel)
Step 2: Get the API Key
Check Claude memory for a YouTube Data API v3 key. If not found, ask:
"I need a YouTube Data API v3 key to fetch video data. You can get one from the Google Cloud Console. Please paste your key."
Step 3: Run the Bundled Script
Run scripts/fetch_thumbnails.py — resolve the path relative to this skill's own directory:
# Topic search
YT_API_KEY=API_KEY python3 <skill-dir>/scripts/fetch_thumbnails.py --topic "TOPIC" --max 20
# Channel
YT_API_KEY=API_KEY python3 <skill-dir>/scripts/fetch_thumbnails.py --channel "@handle" --max 20
Dependencies: pip3 install google-api-python-client requests.
The script ranks videos by views, downloads the highest-resolution thumbnail available
(maxres → sd → hq → mq), and writes an index.md alongside the images.
Step 4: Read the Data
reports/data/thumbnail-analysis-<slug>-<YYYY-MM-DD>.json
Thumbnails land in reports/thumbnails/<slug>-<YYYY-MM-DD>/ with an index.md in
the same folder. The JSON's videos[].thumbnail_path gives each image's full path.
Step 5: Visually Analyze the Thumbnails
This is the step that makes this skill unique — Claude can see images.
Read each downloaded thumbnail with the Read tool (it supports images). For each:
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 180 lines · 133 tokens per session scan A 982514a150fa
youtube-thumbnail-analyzer is a skill published in the GitHub repository nikhilbhansali/youtube-data-skills (2 stars, last pushed 24d ago), licensed MIT. It adds 133 tokens to every session and 1,588 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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