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 sailingnaturali/claude-skills --skill record-web-gifgit clone --depth 1 https://github.com/sailingnaturali/claude-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/sailingnaturali/claude-skills/record-web-gif)<a href="https://agentmods.dev/skills/sailingnaturali/claude-skills/record-web-gif"><img src="https://agentmods.dev/badge/skills/sailingnaturali/claude-skills/record-web-gif/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/sailingnaturali/claude-skills/record-web-gif"><img src="https://agentmods.dev/badge/skills/sailingnaturali/claude-skills/record-web-gif.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 | $0.00063 | $0.01132 |
| Opus 5 | $0.00032 | $0.00566 |
| Sonnet 5 | $0.00013 | $0.00226 |
| Haiku 4.5 | $0.00006 | $0.00113 |
Grade A, and why
record-web-gif scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Record a Web App to a GIF
Drive Chrome with puppeteer-core (your system Chrome — no chromium download), capture
frames over CDP, and assemble a clean GIF with ffmpeg. One bundled script does all of it.
Prerequisites
ffmpegon PATH (brew install ffmpeg).puppeteer-coreresolvable from where you run the script:npm i puppeteer-corein a scratch dir and run the script from there (it uses your installed Chrome, so no large download).- Google Chrome (or Chromium) installed. Override with
--chrome PATHor$CHROME_PATH.
Quick start
Record a 12s clip and write the GIF in one command:
node record-gif.mjs "http://localhost:5173/" out.gif \
--duration 12000 --fps 15 --size 1000x630 --scale 800
For an app where you press a button to start an animation, and you want the UI chrome out of the frame:
node record-gif.mjs "http://localhost:5173/?demo=1" out.gif \
--wait-text Start --start-text Start --hide ".controls" \
--duration 31000 --fps 15
Options
| Flag | Purpose | Default |
|---|---|---|
--duration MS |
clip length | 12000 |
--fps N |
target capture rate | 15 |
--size WxH |
capture viewport | 1000x630 |
--scale W |
GIF width (height auto) — shrink for size | = capture width |
--headless |
run headless (see WebGL note) | off (headful) |
--wait-text "T" |
wait for an enabled <button> with this text before starting |
— |
--start-text "T" |
click the <button> with this text to begin |
— |
--hide "SEL" |
CSS selector to hide while recording (repeatable) | — |
--settle MS |
pause after load (lets tiles/fonts settle) | 1500 |
--chrome PATH |
Chrome/Chromium executable | auto-detect |
--keep-frames |
keep the temp frame dir | off |
The GIF is assembled with a 2-pass palette (palettegen/paletteuse) at the effective
capture rate, so playback is real-time with clean colors.
WebGL / canvas apps (MapLibre, three.js, charts) — read this
What ships with it
1 file 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 · 85 lines · 63 tokens per session scan A e732bbdc6510
record-web-gif is a skill published in the GitHub repository sailingnaturali/claude-skills (2 stars, last pushed 6d ago), licensed MIT. It adds 63 tokens to every session and 1,132 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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