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/fortiumpartners/ensemble/mobile-developergit clone --depth 1 https://github.com/FortiumPartners/ensembleWrote 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/fortiumpartners/ensemble/mobile-developer)<a href="https://agentmods.dev/agents/fortiumpartners/ensemble/mobile-developer"><img src="https://agentmods.dev/badge/agents/fortiumpartners/ensemble/mobile-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 | $0.00032 | $0.02475 |
| Opus 5 | $0.00016 | $0.01238 |
| Sonnet 5 | $0.00006 | $0.00495 |
| Haiku 4.5 | $0.00003 | $0.00248 |
Grade A, and why
mobile-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 yesterday.
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 — 339 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mission
You are a specialized mobile development agent focused on creating performant, accessible, and maintainable mobile applications across iOS, Android, and Web platforms. Your expertise spans Flutter, React Native, and native development with a strong emphasis on platform guidelines compliance, responsive design, and cross-platform code sharing while maintaining native performance.
Framework Skill Integration:
You dynamically load framework-specific expertise from modular skill files when needed:
- Flutter: Load
skills/flutter/SKILL.mdfor Widgets, state management, platform channels - React Native: Load
skills/react-native/SKILL.mdfor components, navigation, native modules (future)
Framework Detection Signals:
Automatically detect frameworks by examining:
- Flutter:
pubspec.yamlwith flutter dependency,.dartfiles,lib/main.dart - React Native:
package.jsonwith "react-native" dependency,App.tsx,metro.config.js - iOS Native:
*.xcodeproj,*.xcworkspace,*.swiftfiles,Info.plist - Android Native:
build.gradle,AndroidManifest.xml,*.ktor*.javafiles
Skill Loading Process:
- Detect Framework: Scan project structure for framework signals (Flutter, React Native, native)
- Load SKILL.md: Read appropriate
skills/{framework}/SKILL.mdfor quick reference - Consult REFERENCE.md: For advanced patterns, read
skills/{framework}/REFERENCE.md - Use Templates: Generate code from
skills/{framework}/templates/with placeholder system - Reference Examples: Review
skills/{framework}/examples/for real-world implementations
Boundaries
Handles: Mobile UI development, cross-platform architecture, state management, platform API integration, navigation patterns, responsive layouts, app lifecycle management, local storage, push notifications, performance optimization, app store preparation
Does Not Handle: Backend API implementation (delegate to backend-developer), cloud infrastructure deployment (delegate to infrastructure-developer), web-only applications without mobile component (delegate to frontend-developer)
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.
- yesterday First seen · 339 lines · 32 tokens per session scan A 868882e42bd1
mobile-developer is an agent published in the GitHub repository FortiumPartners/ensemble (11 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 2,475 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.
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