Instructions for recording terminal demos with VHS and converting the recordings into GIF images. The process uses Docker, a tool for running isolated environments, plus ffmpeg for video conversion.

Use it to run the demo build, troubleshoot recording problems, or regenerate GIFs from existing MP4 video files.

It documents the project’s recording pipeline and helps diagnose failed recordings or empty GIF files.

How babarot/gh-infra configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to babarot/gh-infra. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/babarot/gh-infra/main/.claude/skills/vhs-demo/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/babarot/gh-infra

Made for: Claude Code.

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/babarot/gh-infra/vhs-demo/github.svg)](https://agentmods.dev/skills/babarot/gh-infra/vhs-demo)

Your own site

<a href="https://agentmods.dev/skills/babarot/gh-infra/vhs-demo"><img src="https://agentmods.dev/badge/skills/babarot/gh-infra/vhs-demo/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/babarot/gh-infra/vhs-demo"><img src="https://agentmods.dev/badge/skills/babarot/gh-infra/vhs-demo.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,415 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	$0.00035	$0.01415
Opus 5.5	$0.00014	$0.00566
Sonnet 5.5	$0.00007	$0.00283
Haiku 4.5	$0.00003	$0.00142

Measured 18d ago against content hash fa0c29a35639, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

vhs-demo 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 18d 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.

.claude/skills/vhs-demo/SKILL.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.

VHS Demo Recording

Use this skill to run, debug, or regenerate gh-infra demo GIF recordings.

When To Use

Running mise run demo or docs/tapes/vhs.sh directly
Diagnosing why a recording failed or produced a 0-byte GIF
Regenerating GIFs from existing MP4s without re-recording
Understanding the recording pipeline

Prerequisites

Docker must be running
Go toolchain (for cross-compiling the Linux binary)

Recording some tapes

mise run demo demo demo-light records only the named tapes (docs/tapes/<name>.tape) and copies only their GIFs; docs/tapes/vhs.sh takes the names the same way. Use it after changing one scene instead of recording all of them. Only demo* tapes are copied to docs/public/; others, such as showcase (16:9, for use outside the docs), stay as docs/tapes/<name>.gif and .mp4. VHS needs an even width and height for the MP4.

Pipeline

mise run demo  (scripts/demo.sh)
  1. go build -o docs/tapes/.gh-infra  (GOOS=linux GOARCH=amd64)
  2. docs/tapes/vhs.sh
     a. docker build → gh-infra-vhs image (VHS + vim)
     b. For each *.tape in parallel:
        docker run --memory=1g --cpus=2 → produces .mp4
     c. For each .mp4 sequentially:
        docker run jrottenberg/ffmpeg:7-alpine → produces .gif
  3. Copy the recorded GIFs to docs/public/
  4. Clean up .gh-infra binary

Why MP4 → GIF Instead of Direct GIF

VHS's built-in GIF output is unreliable when multiple containers run in parallel on macOS. The workaround is to output MP4 only from VHS, then convert to GIF via ffmpeg with high-quality settings (lanczos scaling, sierra2_4a dithering, 256 colors).

Key Files

File	Role
`docs/tapes/vhs.sh`	Orchestrator: parallel recording + sequential GIF conversion
`docs/tapes/Dockerfile`	`ghcr.io/charmbracelet/vhs` + vim
`docs/tapes/*.tape`	VHS scenario files
`docs/tapes/setup*.sh`	Per-demo setup scripts (mock data, gh wrapper)
`docs/tapes/mock-gh`	Generic mock for `gh` CLI
`docs/tapes/.gh-infra`	Cross-compiled Linux binary (ephemeral)

Read the full file on GitHub · 123 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.

18d ago Changed · +4 lines fa0c29a35639
2mo ago First seen · 119 lines · 35 tokens per session scan A 5ab1b10c9a7e

Subscribe to this mod's changes

vhs-demo is a skill published in the GitHub repository babarot/gh-infra (140 stars, last pushed 3d ago), licensed MIT. It adds 35 tokens to every session and 1,415 once invoked, about $0.0001 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 2026-08-30.

Creative and media cli gh-extension github go

vhs-demo next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
vhs-demobabarot/gh-infra	Skill	140	3d ago	MIT	A	35	Claude Code
gh-attachsudosubin/gh-attach	Skill	45	10d ago	MIT	A	94	Claude Code, Codex
gh-stackgithub/gh-stack	Skill	1.7k	3d ago	MIT	A	80	Claude Code, Codex
pkup-enchantpPrecel/pkup-gen	Skill	12	2mo ago	MIT	A	59	Claude Code, Codex
pkup-genpPrecel/pkup-gen	Skill	12	2mo ago	MIT	A	27	Claude Code, Codex
dd-code-generationDataDog/pup	Skill	1.0k	yesterday	Apache-2.0	A	16	Claude Code
write-zot-themespatriceckhart/zot	Skill	359	yesterday	MIT	A	23	Claude Code, Codex

gh-infra: Skill for Claude Code