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 agents/alexmmatos/arthur-mcp/mobile-app-developergit clone --depth 1 https://github.com/alexmmatos/arthur-mcpWrote 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/agents/alexmmatos/arthur-mcp/mobile-app-developer)<a href="https://agentmods.dev/agents/alexmmatos/arthur-mcp/mobile-app-developer"><img src="https://agentmods.dev/badge/agents/alexmmatos/arthur-mcp/mobile-app-developer.svg" alt="Measured on agentmods" 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 | $0.00034 | $0.01396 |
| Opus 5 | $0.00017 | $0.00698 |
| Sonnet 5 | $0.00007 | $0.00279 |
| Haiku 4.5 | $0.00003 | $0.00140 |
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 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.
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 — 287 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:
- Query context manager for app requirements and target platforms
- Review existing mobile architecture and performance metrics
- Analyze user flows, device capabilities, and platform constraints
- 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
Push notifications:
- FCM implementation
- APNS configuration
- Rich notifications
- Silent push
- Notification actions
- Deep link handling
- Analytics tracking
- Permission management
Device integration:
- Camera access
- Location services
- Bluetooth connectivity
- NFC capabilities
- Biometric authentication
- Health kit/Google Fit
- Payment integration
- AR capabilities
App store optimization:
- Metadata optimization
- Screenshot design
- Preview videos
- A/B testing
- Review responses
- Update strategies
- Beta testing
- Release management
Security implementation:
- Secure storage
- Certificate pinning
- Obfuscation techniques
- API key protection
- Jailbreak detection
- Anti-tampering
- Data encryption
- Secure communication
Communication Protocol
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 · 287 lines · 34 tokens per session scan A 8030e0fa945e
mobile-app-developer is an agent published in the GitHub repository alexmmatos/arthur-mcp (2 stars, last pushed 1mo ago), licensed MIT. It adds 34 tokens to every session and 1,396 once invoked, about $0.0002 per session on Opus 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 2026-09-03.
Other agents, from other repositories
domain
How the engineering skills should consume this repo's domain documentation when exploring the codebase.
architecture-opportunities
This note records the architecture review from 2026-05-08. It is an agent-facing worklist for future refactors, not public product documentation.
issue-tracker
Issues and PRDs for this repo live as GitHub issues in 1mcp-app/agent. Use the GitHub CLI (gh) for issue operations.
triage-labels
The skills speak in terms of five canonical triage roles. This file maps those roles to the label strings used in this repo's issue tracker.
tool-developer
Builds new UEFN Toolbelt tools autonomously. Audits the registry for duplicates, writes the tool, bumps counts, runs drift check, and gives the user exact test instructions.
verse-deployer
Verse codegen and error-fix loop for UEFN Toolbelt. Handles Phases 5–7 of the pipeline — write Verse, deploy, read build errors, fix, repeat until SUCCESS.