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 JuanMarchetto/agent-skills --skill webreelgit clone --depth 1 https://github.com/JuanMarchetto/agent-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/juanmarchetto/agent-skills/webreel)<a href="https://agentmods.dev/skills/juanmarchetto/agent-skills/webreel"><img src="https://agentmods.dev/badge/skills/juanmarchetto/agent-skills/webreel/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/juanmarchetto/agent-skills/webreel"><img src="https://agentmods.dev/badge/skills/juanmarchetto/agent-skills/webreel.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 | $0.00089 | $0.03775 |
| Opus 5 | $0.00044 | $0.01887 |
| Sonnet 5 | $0.00018 | $0.00755 |
| Haiku 4.5 | $0.00009 | $0.00378 |
Grade A, and why
webreel 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 7d 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 — 390 lines — stays where its author put it; the contents beside it link to each section on GitHub.
webreel
webreel records scripted browser demos as MP4, GIF, or WebM with cursor animation, keystroke overlays, and sound effects. You define steps in a JSON config, and webreel drives headless Chrome, captures frames, and encodes with ffmpeg.
Installation
Install webreel as a project dependency so the version is pinned in the lockfile. This ensures deterministic recordings across machines and CI.
npm install webreel
If the project already has webreel in its dependencies, skip this step.
Prerequisites
webreel requires Chrome and ffmpeg, but you do NOT need to install them manually. Both are automatically downloaded to ~/.webreel on first run if not already present. Do not install Chrome or Chromium via puppeteer, playwright, or any other tool. webreel manages its own browser.
To download dependencies explicitly, or to fix corrupted/broken binaries:
npx webreel install
npx webreel install --force # delete cached binaries and re-download
To override the auto-downloaded binaries, set these environment variables:
CHROME_PATH- path to a Chrome or Chromium binary (used for preview)CHROME_HEADLESS_PATH- path to a chrome-headless-shell binary (used for recording)FFMPEG_PATH- path to an ffmpeg binary
If a recording fails with "No inspectable targets" or similar browser errors, the issue is almost certainly in the webreel config (wrong waitFor, missing element, timing), not a missing browser. Check the config and use --verbose to debug.
.gitignore
The .webreel directory is created at the project root during recording (frames, intermediate files). Add it to .gitignore:
.webreel
Quick start
# Scaffold a config
npx webreel init --name my-demo --url https://example.com
# Edit webreel.config.json with your steps
# Preview in a visible browser (no recording)
npx webreel preview my-demo
# Record the video
npx webreel record my-demo
npx resolves to the locally installed version when webreel is in devDependencies. Output lands in videos/ by default (configurable via outDir).
What ships with it
5 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.
- 7d ago First seen · 390 lines · 89 tokens per session scan A 65fa52195014
webreel is a skill published in the GitHub repository JuanMarchetto/agent-skills (5 stars, last pushed 5mo ago), licensed MIT. It adds 89 tokens to every session and 3,775 once invoked, about $0.0004 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 2026-09-03.
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