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 mad-coders/fullpage-screenshot-ai-skill --skill fullpage-screenshotgit clone --depth 1 https://github.com/mad-coders/fullpage-screenshot-ai-skillWrote 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/mad-coders/fullpage-screenshot-ai-skill/fullpage-screenshot)<a href="https://agentmods.dev/skills/mad-coders/fullpage-screenshot-ai-skill/fullpage-screenshot"><img src="https://agentmods.dev/badge/skills/mad-coders/fullpage-screenshot-ai-skill/fullpage-screenshot/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/mad-coders/fullpage-screenshot-ai-skill/fullpage-screenshot"><img src="https://agentmods.dev/badge/skills/mad-coders/fullpage-screenshot-ai-skill/fullpage-screenshot.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 | $0.00069 | $0.01002 |
| Opus 5 | $0.00034 | $0.00501 |
| Sonnet 5 | $0.00014 | $0.00200 |
| Haiku 4.5 | $0.00007 | $0.00100 |
Grade A, and why
fullpage-screenshot 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 12d 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 — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Full-page screenshots across breakpoints
Capture a whole page - not just the visible viewport - at several widths in one run, and get a report that doubles as a responsive-layout check.
Install
make install # into ~/.claude/skills, available in every project
make check # confirm it is installed and a browser will start
make install-project puts it in ./.claude/skills instead, so it travels
with a repository. make link symlinks rather than copies, so git pull
updates the installed skill. make uninstall removes it.
Quick start
make capture URL=https://example.com
# or
node scripts/capture.mjs --url https://example.com --out ./screenshots
Widths default to 375,768,992,1200,1440. Override with --widths.
If a capture will not start, node scripts/capture.mjs --check lists every
browser it can find and reports which of them actually launch.
Why not just take a screenshot
Three things make this harder than it looks, and the script handles all three.
A viewport screenshot is not a page screenshot. Most tooling captures what is on screen. Stitching slices by scrolling breaks on sticky headers, which reappear in every slice. Use the browser's own full-page capture instead.
Images decode late. A full-page capture fires before lazy or still-decoding
images finish, and you get half-loaded photography in an otherwise perfect
screenshot. The script waits for every <img> to settle first.
The page may need setting up. Behind basic auth, a cookie banner, a state
toggle. --auth covers credentials; --prepare runs arbitrary JS in the page
before the shot.
The report is the point
Every run prints one row per capture:
width requested captured height status
375 375 375 4205 ok
768 768 773 3865 OVERFLOWS BY 5px
A full-page capture expands to fit horizontal overflow. So when the captured width exceeds the requested width, the page overflows sideways at that breakpoint - which is a layout bug you would otherwise have to hunt for. The screenshots come with a free responsive audit attached.
What ships with it
3 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.
- 12d ago First seen · 111 lines · 69 tokens per session scan A f436fb05c503
fullpage-screenshot is a skill published in the GitHub repository mad-coders/fullpage-screenshot-ai-skill (2 stars, last pushed 27d ago), licensed MIT. It adds 69 tokens to every session and 1,002 once invoked, about $0.0003 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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