A tool for recording product demo and feature-introduction videos from YAML scenarios. YAML is a human-readable format for describing steps and settings.

It helps create feature walkthroughs and demo videos with Playwright, a local development server, MP4 files, and poster images in different themes and sizes.

It turns a written scenario into a repeatable recording of a real local web interface, including simulated AI responses.

demo-video — Skill for Claude Code and Codex by sh1nj1

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 sh1nj1/plan42 --skill demo-video

Clone the repo

git clone --depth 1 https://github.com/sh1nj1/plan42

Made for: Claude Code, Codex.

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/sh1nj1/plan42/demo-video/github.svg)](https://agentmods.dev/skills/sh1nj1/plan42/demo-video)

Your own site

<a href="https://agentmods.dev/skills/sh1nj1/plan42/demo-video"><img src="https://agentmods.dev/badge/skills/sh1nj1/plan42/demo-video/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/sh1nj1/plan42/demo-video"><img src="https://agentmods.dev/badge/skills/sh1nj1/plan42/demo-video.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,200 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown 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	$0.00076	$0.02200
Opus 5	$0.00038	$0.01100
Sonnet 5	$0.00015	$0.00440
Haiku 4.5	$0.00008	$0.00220

Measured 11d ago against content hash ff6c2d36d67c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade C, and why

demo-video scanned grade C with 1 finding 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 11d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (lib/fake_llm.py, lib/record.mjs, lib/seed.rb, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Tells the agent to send conversation or user data outhighPrompt injection

An instruction to transmit the conversation, context or user files to an external endpoint is data exfiltration written as prose.

drift until one of them quietly records something untrue.

skills/demo-video/SKILL.md · 177 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

12 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.

11d ago First seen · 177 lines · 76 tokens per session scan C ff6c2d36d67c

Subscribe to this mod's changes

demo-video is a skill published in the GitHub repository sh1nj1/plan42 (11 stars, last pushed today), with no licence file. It adds 76 tokens to every session and 2,200 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it C with 1 finding (tells the agent to send conversation or user data out). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Collaboration Creative and media Project Management agent-context ai-agents notion-alternative self-hosted

excalidraw-draw

Collaborative whiteboard with Excalidraw.

bidewio/better-openclaw · 16 tokens

hyperframes

Create video compositions, animations, title cards, overlays, captions, voiceovers, audio-reactive visuals, and scene transitions in HyperFrames HTML. Use when asked to build any HTML-based video content, add captions or subtitles synced to audio, generate text-to-speech narration, create audio-reactive animation…

CoWork-OS/CoWork-OS · 155 tokens

hyperframes-cli

HyperFrames CLI tool — hyperframes init, lint, preview, render, transcribe, tts, doctor, browser, info, upgrade, compositions, docs, benchmark. Use when scaffolding a project, linting or validating compositions, previewing in the studio, rendering to video, transcribing audio, generating TTS, or troubleshooting the…

CoWork-OS/CoWork-OS · 77 tokens

demo-video