A tool for recording scripted browser demonstrations as MP4, GIF, or WebM video files.

Use it to create product demos, screen recordings, previews, and other repeatable browser videos from a JSON script.

It removes the need to record browser actions manually and can add cursor movement, keystrokes, and sound effects.

webreel — Skill for Claude Code by JuanMarchetto/agent-skills

Install

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.

Any agent

npx skills add JuanMarchetto/agent-skills --skill webreel

Clone the repo

git clone --depth 1 https://github.com/JuanMarchetto/agent-skills

Made for: Claude Code.

Or install webreel, the plugin that ships this one along with the rest of its 1 skill.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/juanmarchetto/agent-skills/webreel/github.svg)](https://agentmods.dev/skills/juanmarchetto/agent-skills/webreel)

Your own site

<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.

Your own site · 80×15

<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>

Per session 89 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,775 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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 5.5	$0.00036	$0.01510
Sonnet 5.5	$0.00018	$0.00755
Haiku 4.5	$0.00009	$0.00378

Measured 2mo ago against content hash 65fa52195014, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo 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.

skills/webreel/SKILL.md · 390 lines

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).

Read the full file on GitHub · 390 lines

Files

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.

Changes

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.

2mo ago First seen · 390 lines · 89 tokens per session scan A 65fa52195014

Subscribe to this mod's changes

webreel is a skill published in the GitHub repository JuanMarchetto/agent-skills (5 stars, last pushed 7mo ago), licensed MIT. It adds 89 tokens to every session and 3,775 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 2026-09-03.

Browser automation Claude Code Creative and media Evaluation ai-agents ai-tools automation browser-automation

webreel next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
webreelJuanMarchetto/agent-skills	Skill	5	7mo ago	MIT	A	89	Claude Code
x402browser-use/browser-use	Skill	121k	yesterday	MIT	A	166	Claude Code
browser-usebrowser-use/browser-use	Skill	121k	yesterday	MIT	A	54	Claude Code, Codex
remote-browserbrowser-use/browser-use	Skill	121k	yesterday	MIT	A	22	Claude Code
cloudbrowser-use/browser-use	Skill	121k	yesterday	MIT	A	177	Claude Code
opencli-autofixjackwener/OpenCLI	Skill	31k	4d ago	Apache-2.0	A	61	Claude Code
opencli-adapter-authorjackwener/OpenCLI	Skill	31k	4d ago	Apache-2.0	A	38	Claude Code

webreel

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

webreel

Installation

Prerequisites

.gitignore

Quick start

What ships with it

What this file has done since we first saw it

webreel compared with skills from other repositories