Borrowing it
Nothing to install: this file belongs to nguyenyou/scalex. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/nguyenyou/scalex/main/.agents/skills/capture-banners/SKILL.mdgit clone --depth 1 https://github.com/nguyenyou/scalexWrote 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/nguyenyou/scalex/capture-banners)<a href="https://agentmods.dev/skills/nguyenyou/scalex/capture-banners"><img src="https://agentmods.dev/badge/skills/nguyenyou/scalex/capture-banners/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/nguyenyou/scalex/capture-banners"><img src="https://agentmods.dev/badge/skills/nguyenyou/scalex/capture-banners.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 | $0.00099 | $0.00582 |
| Opus 5.5 | $0.00040 | $0.00233 |
| Sonnet 5.5 | $0.00020 | $0.00116 |
| Haiku 4.5 | $0.00010 | $0.00058 |
Grade A, and why
capture-banners 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 1mo 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.
What it actually says
Capture Banners
The Scalex project has 4 banner images that are rendered from HTML source files. When the HTML is edited, the PNGs must be re-captured to stay in sync.
Banner inventory
| HTML source | PNG output | Purpose |
|---|---|---|
site/readme-banner-dark.html |
site/readme-banner-dark.png |
GitHub README banner (dark mode) |
site/readme-banner-light.html |
site/readme-banner-light.png |
GitHub README banner (light mode) |
site/og-banner.html |
site/og-banner.png |
OpenGraph social preview (dark) |
site/og-banner-light.html |
site/og-banner-light.png |
OpenGraph social preview (light) |
Required viewport size
All banners are designed at 1200 x 630 pixels. The HTML <body> is hardcoded to this size. The Chrome DevTools viewport must match exactly, otherwise the screenshot will crop or include extra whitespace.
Capture procedure
Use Chrome DevTools MCP tools. For each banner:
-
Open or navigate to the HTML file using a
file://URL:file:///absolute/path/to/scalex/site/readme-banner-dark.html -
Resize the viewport to 1200x630:
mcp__chrome-devtools__resize_page(width=1200, height=630) -
Take a screenshot and save directly to the PNG path:
mcp__chrome-devtools__take_screenshot( filePath="site/readme-banner-dark.png", format="png" ) -
Repeat for the remaining 3 banners. You can reuse the same tab by navigating to the next HTML file.
Notes
- The Kestrel mascot image (
Kestrel.png) is referenced by relative path in the HTML, so the file:// URL must point to thesite/directory for it to render. - After capturing, the PNGs are ready to commit — no post-processing needed.
- If the images look wrong (missing mascot, broken layout), check that the HTML references are correct relative to the
site/directory.
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.
- 1mo ago First seen · 52 lines · 99 tokens per session scan A 807fc29cd576
capture-banners is a skill published in the GitHub repository nguyenyou/scalex (110 stars, last pushed 1mo ago), licensed MIT. It adds 99 tokens to every session and 582 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-08-30.
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