A workflow for creating a narrated software demo video by driving the application, recording the useful actions, generating voiceover, and assembling the result.

Use it to make product overviews, onboarding walkthroughs, or launch videos with screen actions, narration, optional presenter footage, transitions, and a final MP4.

It separates rehearsal from the final replay so the finished demo follows a planned sequence instead of showing exploration or mistakes.

demo-video — Skill for Claude Code by mrieck/demoday-claude-plugin

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add mrieck/demoday-claude-plugin

Claude Code

/plugin install demoday

Made for: Claude Code.

Or install demoday, the plugin that ships this one along with the rest of its 6 skills, 1 command, 1 MCP server.

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/mrieck/demoday-claude-plugin/demo-video/github.svg)](https://agentmods.dev/skills/mrieck/demoday-claude-plugin/demo-video)

Your own site

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

Per session 116 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 7,330 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	$0.00116	$0.07330
Opus 5.5	$0.00046	$0.02932
Sonnet 5.5	$0.00023	$0.01466
Haiku 4.5	$0.00012	$0.00733

Measured 9d ago against content hash 6f3d9749ce4d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

demo-video 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 9d 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/demo-video/SKILL.md · 546 lines

How it starts

The opening of the file, as written. The whole thing — 546 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Making a demo video

You are producing a finished video of someone's software. Not a screen recording — a demo: narrated, paced, with an intro, transitions and a point.

$CLAUDE_PLUGIN_ROOT is the plugin root (outside Claude Code: the folder DemoDay is installed in — two directories above this file, the one holding scripts/, mcp/ and the top-level SKILL.md). Every command below runs from there unless stated. Each video is its own project directory under <repo>/demo/, named with a short kebab-case description of that video: demo/project-overview/ for a generic overview, demo/onboarding-flow/, demo/v2-launch/. A repo accumulates one subfolder per video. Pick the folder name when you pick the slug (they should match) and pass it as --project demo/<slug> on every script call — never bare --project demo, and never rely on the default project dir. The examples below write demo/<slug>; always substitute the real folder.

The one thing to understand first

Two passes. Never record yourself exploring.

Rehearsal — you drive the app through the demo_* MCP tools, taking a screenshot after each action, working out what is worth showing. Nothing is recorded. The result is an action script.
Performance — a runner replays that script deterministically, with eased cursor motion and human typing, while recording. No model in the loop, so the footage is smooth and has no dead air.

A recording of you thinking is unwatchable. This is why the split exists.

Order of operations

Narration is generated before any capture. Once a line is spoken you know exactly how long it takes, so the capture can be paced to land on it. Doing it the other way round produces rushed voiceover or silence at the end of every scene.

recon → direction → script → narration → rehearse → perform → presenter/b-roll → render → QA

0. Preflight

node scripts/doctor.mjs --install

Installs missing Node packages and Chromium, then checks keys, ffmpeg and macOS permissions, printing the exact fix for anything it cannot do itself. Do this before the first video on a machine and again whenever something fails mysteriously. If the demo_* tools are missing from your tool list even though the server is configured, the MCP server was started before its packages existed — reload MCP servers or restart the agent after --install, or use node scripts/stage.mjs (see §5).

Read the full file on GitHub · 546 lines

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.

9d ago Changed · +27 lines · +3 tokens per session 6f3d9749ce4d
1mo ago Changed · +120 lines c9740ab6694d
1mo ago Changed · -2 lines e878c3980667
2mo ago Changed · +42 lines 39d25a879107
2mo ago First seen · 359 lines · 113 tokens per session scan A ec35cf7cd7af

Subscribe to this mod's changes

demo-video is a skill published in the GitHub repository mrieck/demoday-claude-plugin (17 stars, last pushed 10d ago), licensed MIT. It adds 116 tokens to every session and 7,330 once invoked, about $0.0005 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 2026-08-31.

Claude Code Creative and media ai-video claude-code-plugin claude-plugin demo-video-generator demo-videos

demo-video next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
demo-videomrieck/demoday-claude-plugin	Skill	17	10d ago	MIT	A	116	Claude Code
chief-revenue-officercbrock84/headcount	Skill	2.6k	19d ago	MIT	A	0	Claude Code
chief-strategy-officercbrock84/headcount	Skill	2.6k	19d ago	MIT	A	93	Claude Code
support-operationscbrock84/headcount	Skill	2.6k	19d ago	MIT	A	77	Claude Code
ai-ml-governancecbrock84/headcount	Skill	2.6k	19d ago	MIT	A	83	Claude Code
paid-advertisingcbrock84/headcount	Skill	2.6k	19d ago	MIT	A	78	Claude Code
seo-strategycbrock84/headcount	Skill	2.6k	19d ago	MIT	A	74	Claude Code