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.
npx agentmods add skills/steipete/agent-scripts/vm-labnpx skills add steipete/agent-scripts --skill vm-labgit clone --depth 1 https://github.com/steipete/agent-scriptsWhat 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 | $0.00025 | $0.01662 |
| Opus 5 | $0.00013 | $0.00831 |
| Sonnet 5 | $0.00005 | $0.00332 |
| Haiku 4.5 | $0.00003 | $0.00166 |
Grade B, and why
vm-lab scanned grade B 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 2d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
'sudo -u steipete -H /bin/zsh -lc '\''source ~/.zprofile 2>/dev/null || true; uname -a'\''' How it starts
The opening of the file, as written. The whole thing — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VM Lab
Use this when the task needs a clean macOS VM to test GUI automation, TCC prompts, screenshot capture, clicking, typing, performance, or "two-way validation" of Peekaboo-like tools.
Core idea: run the tool under test inside the guest, but verify it from outside the guest with Parallels screenshots and host-side observations. Do not close apps you do not own.
Safety Rules
- Treat the VM snapshot as disposable, not the host.
- Never print secrets. If
opis needed, follow the 1Password skill and run it only insidetmux. - Prefer fresh app windows you create yourself: TextEdit, a local HTML test page, or a small test app.
- Avoid modifying host state except temporary screenshots under
/tmp. - For git repos inside the VM, use HTTPS remotes and normal branch discipline.
VM Discovery
List VMs:
prlctl list --all
Get VM status/IP:
prlctl list --info "macOS Tahoe"
Run guest commands as Peter:
prlctl exec "macOS Tahoe" \
'sudo -u steipete -H /bin/zsh -lc '\''source ~/.zprofile 2>/dev/null || true; uname -a'\'''
Capture an independent host-side screenshot:
prlctl capture "macOS Tahoe" --file /tmp/vm-reference.png
sips -g pixelWidth -g pixelHeight /tmp/vm-reference.png
TCC / GUI Attribution
For macOS Screen Recording and Accessibility, the responsible process matters.
prlctl execis headless and can fail to produce useful Screen Recording attribution.- Launch the test command from a visible terminal app in the guest when Screen Recording is involved.
- Ghostty works as a GUI terminal if installed.
- After a first failed capture, check
System Settings > Privacy & Security > Screen & System Audio Recording. permissions statusrun throughprlctl execmay still report Screen Recording false after Ghostty is allowed; validate Screen Recording by rerunning the capture from Ghostty.
Open the Screen Recording pane:
prlctl exec "macOS Tahoe" \
'sudo -u steipete -H open "x-apple.systempreferences:com.apple.preference.security?Privacy_ScreenCapture"'
What ships with it
2 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.
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.
- 2d ago First seen · 173 lines · 25 tokens per session scan B fec816569176
vm-lab is a skill published in the GitHub repository steipete/agent-scripts (6,590 stars, last pushed today), licensed MIT. It adds 25 tokens to every session and 1,662 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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