EAS Simulator Agent Skill

EAS service (paid). Run and control a user's app on a remote iOS/Android simulator hosted on EAS cloud. Read before running any `eas…

Context cost
13k tokensestimated from the bundle, loaded when it triggers
Bundle
5 files · 51.9 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—v1.0.0
Servers it uses
Noneruns standalone

What it does

EAS service (paid). Run and control a user's app on a remote iOS/Android simulator hosted on EAS cloud. Read before running any `eas simulator:*` commands - it has the current syntax for this experimental API. Use whenever the user needs a simulator they can't run locally - 'run my app on a cloud simulator', 'use eas simulator to run/install/screenshot my app', 'I'm on Linux/Cursor and need an iOS device', 'no sim on this box / headless CI', 'let an agent click through my app and screenshot it', 'test my dev build on a remote sim with live reload', 'stream a sim to my browser' - even when…

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

androidiosmobile

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md22.7 kB · preview
--- name: eas-simulator version: 1.0.0 license: MIT allowed-tools: "Bash(npx *eas-cli@*), Bash(npx *agent-device@*), Bash(npx expo *), Bash(eas *), Bash(expo *), Bash(xcodebuild*), Bash(pod*), Bash(argent *), Bash(ffmpeg*)" ---
9# EAS Simulator
10
11> **EAS service - costs apply.** EAS Simulator runs on Expo Application Services cloud infrastructure, a paid product with free-tier limits; remote simulator sessions use your plan's compute allowance. See https://expo.dev/pricing.
12
13EAS Simulator runs a remote iOS simulator or Android emulator on EAS infrastructure that you drive from your machine — from the CLI, from an AI agent (via agent-device), and from a browser preview. It's the unlock for **environments that can't run a simulator locally** (Linux boxes, cloud/background agents like Cursor Cloud), and for letting an agent *verify* a change on a real device instead of only reasoning about code.
14
15The simulator:* commands are **experimental and hidden**, and need a recent eas-cli (≥ 20.3.0 as of writing) — which is why this skill runs everything via npx --yes eas-cli@latest. Flags and verbs may change; if a command fails, **<cmd> --help is authoritative.**
16
17## When to use
18
19The frontmatter description carries the trigger phrases. In short: use this to get a user's app onto a **cloud** simulator and interact with it — especially from a Mac-less or cloud/sandbox agent. **Not** for local sims (expo run:ios, Xcode, Android Studio), store builds/signing (that's EAS Build), or physical devices. For the macOS case, see *Cloud vs local* next.
20
21## Cloud vs local: decide this first
22
23- **Non-macOS** (Linux / CI / cloud sandbox like Cursor Cloud, detect via uname -s ≠ Darwin): the only way to get a sim — **proceed, once you've confirmed access** (see *Check availability first* below).
24- **macOS:** local sims exist and a cloud session costs money + latency, so **ask first** ("a remote cloud sim — to share a live preview, offload, or test an iOS version you lack — or just run locally?") unless the user explicitly said cloud/remote/shareable.
25- Always honor an explicit choice; for "run it locally" hand off to expo run:ios / Xcode.
26
27```bash
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md3,513 words
Files5
LicenceMIT
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈310
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
12,665
on trigger
The instruction body and 4 supporting files, read only when the skill fires.
6.5%
of a 200k window
Ten skills this size would take about 65% of the window before you open a file.
050k100k150k200k context window

13k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md asks for Bash, which can write files and reach the network alike, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

The allowed-tools line of this skill’s own SKILL.md asks for Bash, which could do either, so neither is ruled out. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

5 files, 51.9 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md22.7 kB
  • agents/openai.yaml0.4 kB
  • references/controllers.md8.1 kB
  • references/run-your-app.md12.9 kB
  • references/troubleshooting.md7.8 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 5 files you can review in full before installing. The MIT licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# EAS Simulator · 13k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/karanmrn-eas-simulator/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/eas-simulator" ] && { [ ! -e .claude/skills/eas-simulator ] || { mv .claude/skills/eas-simulator "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/eas-simulator" .claude/skills/ && echo "Installed .claude/skills/eas-simulator"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add karanmrn/eas-simulator

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/eas-simulator/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/karanmrn-eas-simulator/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/eas-simulator" ] && { [ ! -e ~/.claude/skills/eas-simulator ] || { mv ~/.claude/skills/eas-simulator "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/eas-simulator" ~/.claude/skills/ && echo "Installed ~/.claude/skills/eas-simulator" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/eas-simulator/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Version1.0.0
Publishedno release date on file
PriceFree
Referencekaranmrn/eas-simulator

Versions

v1.0.0 is what is on the shelf; no release here carries a date. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

v1.0.0
  • No earlier releases have been published to the marketplace.
Pinning

The install command always fetches the release that is current the day you run it — v1.0.0 today — and cannot ask for an earlier one. The copy on your disk does not change until you run it again.

Reviews

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