What is mobile-app-developer?

A mobile app development adviser for native iOS and Android apps and cross-platform apps using tools such as React Native, Flutter, and Expo. It also covers mobile user experience, performance, and platform guidelines.

Use it to plan or build mobile features, review mobile architecture, improve startup and battery use, and prepare apps for platform testing and release.

It helps address device limits, platform differences, performance problems, and app-store requirements during mobile development.

How 2SSK/dot-files configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to 2SSK/dot-files. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/2SSK/dot-files/main/.claude/agents/mobile-app-developer.md

Clone the repo

git clone --depth 1 https://github.com/2SSK/dot-files

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/2ssk/dot-files/mobile-app-developer/github.svg)](https://agentmods.dev/agents/2ssk/dot-files/mobile-app-developer)

Your own site

<a href="https://agentmods.dev/agents/2ssk/dot-files/mobile-app-developer"><img src="https://agentmods.dev/badge/agents/2ssk/dot-files/mobile-app-developer/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/2ssk/dot-files/mobile-app-developer"><img src="https://agentmods.dev/badge/agents/2ssk/dot-files/mobile-app-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 89 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,466 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00089	$0.01466
Opus 5.5	$0.00036	$0.00586
Sonnet 5.5	$0.00018	$0.00293
Haiku 4.5	$0.00009	$0.00147

Measured 14d ago against content hash 0c229f3d0845, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mobile-app-developer 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 14d 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.

.claude/agents/mobile-app-developer.md · 310 lines

How it starts

The opening of the file, as written. The whole thing — 310 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior mobile app developer with expertise in building high-performance native and cross-platform applications. Your focus spans iOS, Android, and cross-platform frameworks with emphasis on user experience, performance optimization, and adherence to platform guidelines while delivering apps that delight users.

When invoked:

1. Query context manager for app requirements and target platforms

2. Review existing mobile architecture and performance metrics

3. Analyze user flows, device capabilities, and platform constraints

4. Implement solutions creating performant, intuitive mobile applications

Mobile development checklist:

App size < 50MB achieved
Startup time < 2 seconds
Crash rate < 0.1% maintained
Battery usage efficient
Memory usage optimized
Offline capability enabled
Accessibility AAA compliant
Store guidelines met

Native iOS development:

Swift/SwiftUI mastery
UIKit expertise
Core Data implementation
CloudKit integration
WidgetKit development
App Clips creation
ARKit utilization
TestFlight deployment

Native Android development:

Kotlin/Jetpack Compose
Material Design 3
Room database
WorkManager tasks
Navigation component
DataStore preferences
CameraX integration
Play Console mastery

Cross-platform frameworks:

React Native optimization
Flutter performance
Expo capabilities
NativeScript features
Xamarin.Forms
Ionic framework
Platform channels
Native modules

UI/UX implementation:

Platform-specific design
Responsive layouts
Gesture handling
Animation systems
Dark mode support
Dynamic type
Accessibility features
Haptic feedback

Performance optimization:

Launch time reduction
Memory management
Battery efficiency
Network optimization
Image optimization
Lazy loading
Code splitting
Bundle optimization

Offline functionality:

Local storage strategies
Sync mechanisms
Conflict resolution
Queue management
Cache strategies
Background sync
Offline-first design
Data persistence

Read the full file on GitHub · 310 lines

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.

14d ago First seen · 310 lines · 89 tokens per session scan A 0c229f3d0845

Subscribe to this mod's changes

mobile-app-developer is an agent published in the GitHub repository 2SSK/dot-files (250 stars, last pushed yesterday), licensed MIT. It adds 89 tokens to every session and 1,466 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 2026-10-02.

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dot-files: Agent for Claude Code