Android Emulator App Control Agent Skill

Control and inspect a local Android emulator app through ADB, screenshots, Pillow-based image analysis, and optional desktop coordinate…

Context cost
1.6k tokensestimated from the bundle, loaded when it triggers
Bundle
5 of 6 fileshanded out here; the rest is at its source
Licence
MITthe author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Control and inspect a local Android emulator app through ADB, screenshots, Pillow-based image analysis, and optional desktop coordinate input. Use for repeatable emulator connection checks, visual state capture, app interaction, and dry-run execution planning.

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.

androidmobile

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.md3.0 kB · preview
--- name: android-emulator-app-control ---
6# Android Emulator App Control
7
8Use this skill for local Android emulator workflows that combine ADB and visual inspection. Keep device, package, region, and coordinate values configurable; never assume values from a previous project.
9
10## Workflow
11
121. Read the target project's AGENTS.md, PROJECT_RULES.md, and app-specific documentation. Identify the runtime, dependency file, configuration, evidence directory, and rollback procedure.
132. Validate prerequisites before app actions: Python 3.10+ when Python tooling is used, adb, and Pillow when screenshots are decoded or analyzed. Prefer the project's pinned interpreter and dependency lockfile.
143. Discover or validate the emulator/device with adb devices, then verify the selected device state and the foreground package/window. Do not interact with an unexpected device or window.
154. Capture a baseline screenshot and save it under the project's temporary/session evidence directory. Prefer normalized regions, accessibility selectors, resource IDs, or stable visual anchors over absolute pixels.
165. Perform only the requested action. After each meaningful action, query or capture state again and record timestamp, action, result, and evidence path. Separate observed evidence from algorithmic inference.
176. Default to dry-run/simulation. Enable desktop coordinate input only after explicit confirmation, completed calibration for the current window/layout, foreground-window verification, and a visible emergency-stop path.
187. On mismatch, timeout, changed signal, unexpected window, or stale state, stop the action sequence, preserve evidence, and retry from a fresh state check. Do not silently continue or repeat a mutating action without idempotency evidence.
19
20## Tool choices
21
22- Reuse the project's existing ADB client and screenshot fallback logic when available instead of duplicating it.
23- Use Pillow for deterministic image loading, cropping, color/shape checks, and evidence annotations. Treat OCR or visual classification as untrusted until confirmed across stable frames or a second state query.
24- Use UI selectors/accessibility APIs where available; use coordinates only as a calibrated last resort.
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md395 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.

≈80
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
1,570
on trigger
The instruction body and 4 supporting files, read only when the skill fires.
0.83%
of a 200k window
Ten skills this size would take about 8% of the window before you open a file.
050k100k150k200k context window

1.6k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Middling. Fine to keep on in a project where you use it weekly, worth unloading in one where you never do.

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 does not declare which tools it asks the agent for, 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

This SKILL.md carries no allowed-tools line, so neither is declared. 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

The download carries 5 of the 6 files in its source folder; the list here names 5 files, 6.6 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in. The other one is not in the download, nor is 1 file of a type a skill download does not carry — listed after these, with why.

  • SKILL.md3.0 kB
  • LICENSE1.1 kB
  • README.md1.2 kB
  • agents/openai.yaml0.3 kB
  • references/tool-adapters.md1.0 kB

Not in the download

Not carried is a type a skill download does not hold. Marked read: its SKILL.md or scripts name the file, so without it the skill works only in part. Take them from its source.

  • scripts/install-skill.ps1read · not carried
  • .gitignorenot carried
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the download is 5 files — not the whole of its source: 2 files are left out, and the skill reads one of them. They are listed under the files, with why. 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.

# Android Emulator App Control · 1.6k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/android-emulator-app-control/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/android-emulator-app-control" ] && { [ ! -e .claude/skills/android-emulator-app-control ] || { mv .claude/skills/android-emulator-app-control "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/android-emulator-app-control" .claude/skills/ && echo "Installed .claude/skills/android-emulator-app-control"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add raclen/android-emulator-app-control

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/android-emulator-app-control/ 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/android-emulator-app-control/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/android-emulator-app-control" ] && { [ ! -e ~/.claude/skills/android-emulator-app-control ] || { mv ~/.claude/skills/android-emulator-app-control "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/android-emulator-app-control" ~/.claude/skills/ && echo "Installed ~/.claude/skills/android-emulator-app-control" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/android-emulator-app-control/ 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. Not in this download: 2 files of its source, 1 of them read by its SKILL.md or scripts (the full list, and why). Take them from its source.

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
Versionnot versioned
Publishedno release date on file
PriceFree
Referenceraclen/android-emulator-app-control

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

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Who wrote it

RA
raclen

Publishes on mcprush.

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