setup

A setup command that checks a computer and installs the dependencies needed by the screencast-desktop plugin. It checks display layout, screen capture, video encoding, and narration readiness.

In plain words
What is it for?
Preparing a Windows machine for desktop demo recording, including installing packages, checking ffmpeg, and explaining when voiceover is unavailable.
Why use it?
It identifies missing or misconfigured parts before desktop automation or recording fails, including Python packages, ffmpeg, and voice settings.

Command

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.

agentmods
npx agentmods add commands/jhamidun/screencast-desktop/setup
Clone the repo
git clone --depth 1 https://github.com/JHamidun/screencast-desktop
Per session 26 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 440 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00026 $0.00440
Opus 5 $0.00013 $0.00220
Sonnet 5 $0.00005 $0.00088
Haiku 4.5 $0.00003 $0.00044

Measured yesterday against content hash d46b4838734d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

setup 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 yesterday.

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.

commands/setup.md · 53 lines

What it actually says

Prepare this machine for the screencast-desktop plugin.

  1. Run the diagnostics and show me its output in full:
python "${CLAUDE_PLUGIN_ROOT}/server/doctor.py"

It checks the things that break silently: display scaling, monitor layout (non-primary monitors have negative coordinates), presence of encoders, whether window capture actually works, and whether a voice for narration is available.

  1. If it reported missing packages — install them:
pip install -r "${CLAUDE_PLUGIN_ROOT}/requirements.txt"
  1. If ffmpeg is not found — you need the full build (the stripped-down ones lack the required filters): winget install Gyan.FFmpeg, then verify with ffmpeg -version.

  2. Voiceover needs ELEVENLABS_API_KEY — in the environment variables or in a .env file in the plugin root (ELEVENLABS_API_KEY=..., optionally ELEVENLABS_VOICE_ID=...). Without it everything else works, the video will just have no voice — say so, do not treat it as an error.

  3. If the UI automation binary is missing from the plugin — download it. It is deliberately not shipped with the package: it is a third-party project (sbroenne/mcp-windows, MIT), weighs about 60 MB, and is updated separately. The script verifies the checksum against the one published in the release and installs nothing without a match:

python "${CLAUDE_PLUGIN_ROOT}/server/fetch_ui_binary.py"
  1. Check that both plugin servers are connected:
claude mcp list

screencast and windows-ui should respond.

At the end, say in one line whether the machine is ready to record or what is missing. Do not report success until you have seen the command output.

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.

  1. yesterday First seen · 53 lines · 26 tokens per session scan A d46b4838734d

Subscribe to this mod's changes

setup is a command published in the GitHub repository JHamidun/screencast-desktop (0 stars, last pushed 7d ago), licensed MIT. It adds 26 tokens to every session and 440 once invoked, about $0.0001 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 2026-08-31.