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 skills add Lykhoyda/rn-dev-agent --skill rn-device-controlgit clone --depth 1 https://github.com/Lykhoyda/rn-dev-agentWrote 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.
[](https://agentmods.dev/skills/lykhoyda/rn-dev-agent/rn-device-control)<a href="https://agentmods.dev/skills/lykhoyda/rn-dev-agent/rn-device-control"><img src="https://agentmods.dev/badge/skills/lykhoyda/rn-dev-agent/rn-device-control/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.
<a href="https://agentmods.dev/skills/lykhoyda/rn-dev-agent/rn-device-control"><img src="https://agentmods.dev/badge/skills/lykhoyda/rn-dev-agent/rn-device-control.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00098 | $0.06478 |
| Opus 5.5 | $0.00039 | $0.02591 |
| Sonnet 5.5 | $0.00020 | $0.01296 |
| Haiku 4.5 | $0.00010 | $0.00648 |
Grade A, and why
rn-device-control 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 21d 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.
How it starts
The opening of the file, as written. The whole thing — 539 lines — stays where its author put it; the contents beside it link to each section on GitHub.
rn-device-control — Device Lifecycle and State Extraction
Commands for controlling iOS Simulator and Android Emulator, taking screenshots, reading UI state, and managing device settings. All commands run via bash.
See also: 3-Tier Interaction Model — when to use cdp_interact vs device_press vs Maestro.
When a packaged helper is referenced, resolve <package-root> as ../.. from
this exact SKILL.md. Never interpret it as the user's workspace or scan Codex
caches.
iOS Simulator (simctl)
The raw commands below are non-authoritative diagnostics or manual maintenance.
Never use the booted alias for plugin verification: require
rn_session(action="status") and substitute its exact bound UDID. Prefer
device_* tools, which enforce the session claim and return authority receipts.
Boot and Manage Devices
# List all available simulators
xcrun simctl list devices
# List only booted simulators
xcrun simctl list devices booted
# Boot a specific simulator by name or UDID
xcrun simctl boot "iPhone 16 Pro"
xcrun simctl boot <UDID>
# Shutdown a simulator
xcrun simctl shutdown booted
# Install an app (.app bundle)
xcrun simctl install booted /path/to/YourApp.app
# Uninstall an app
xcrun simctl uninstall booted com.example.app
# Launch an app
xcrun simctl launch booted com.example.app
# Terminate a running app
xcrun simctl terminate booted com.example.app
# Erase all content (reset to factory)
xcrun simctl erase booted
Deep Links
device_deeplink(url="myapp://home")
device_deeplink(url="myapp://product/123")
device_deeplink(url="myapp://checkout")
Prefer deep links over Maestro navigation flows — faster and more deterministic.
On an open exact iOS session, device_deeplink automatically accepts the
SpringBoard-owned Open confirmation and reports
meta.openDialogTapped: true. If a URL was opened externally or the dialog is
still visible, call device_accept_system_dialog(label="Open"); if it returns
DIALOG_BUTTON_NOT_FOUND, retry with one of availableButtons. Never guess
coordinates for a native system dialog.
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.
- 21d ago Changed 976ab7905b62
- 29d ago Changed · +4 lines ad755d62ed6c
- 1mo ago Changed 13d75c42024f
- 1mo ago Changed 16f3f41715f3
- 1mo ago Changed c0ea16573b69
- 1mo ago Changed 6f846ad2ed3f
- 1mo ago First seen · 535 lines · 98 tokens per session scan A bba328589648
rn-device-control is a skill published in the GitHub repository Lykhoyda/rn-dev-agent (20 stars, last pushed today), licensed MIT. It adds 98 tokens to every session and 6,478 once invoked, about $0.0004 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.
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