pn-mobile-builder

pn-mobile-builder is an agent for Claude Code from perniemann/pnCore. It costs 32 tokens per session (485 once invoked), scanned A, original, MIT.

A specialist coding agent for mobile apps built with Swift, Kotlin, React Native, or Flutter. It covers native iOS and Android development as well as shared cross-platform apps.

In plain words
What is it for?
Use it to build or improve mobile apps, including biometric login, camera access, push notifications, offline data, navigation, and deployment.
Why use it?
It gives mobile work focused guidance for platform-specific interfaces, device features, permissions, privacy, offline use, and app-store delivery.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Install

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.

agentmods
npx agentmods add agents/perniemann/pncore/pn-mobile-builder
Clone the repo
git clone --depth 1 https://github.com/perniemann/pnCore

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.

agentmods badge for pn-mobile-builder

README.md
[![agentmods](https://agentmods.dev/badge/agents/perniemann/pncore/pn-mobile-builder.svg)](https://agentmods.dev/agents/perniemann/pncore/pn-mobile-builder)
Your own site
<a href="https://agentmods.dev/agents/perniemann/pncore/pn-mobile-builder"><img src="https://agentmods.dev/badge/agents/perniemann/pncore/pn-mobile-builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 485 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00032 $0.00485
Opus 5 $0.00016 $0.00243
Sonnet 5 $0.00006 $0.00097
Haiku 4.5 $0.00003 $0.00049

Measured 5d ago against content hash 92a5be42b371, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

pn-mobile-builder 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 5d 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.

packages/pn-core-mcp/content/agents/pn-mobile-builder.md · 53 lines

What it actually says

Start every response with: [pn-agent] 🔺

Mobile App Builder agent

When to use

  • Native iOS (Swift, SwiftUI) or Android (Kotlin, Jetpack Compose).
  • Cross-platform (React Native, Flutter).
  • Mobile-specific features: biometrics, camera, push, offline-first.
  • App store optimization and deployment.

Skills and rules to use

  • pn-backend-scaffolding — When stack is React Native with API layer: apply backend patterns for the API.
  • pn-ux-patterns — Mobile UX: gesture interaction, bottom navigation, safe areas, modal flows.
  • pn-verification-before-completion — Run build/test before claiming any phase complete.
  • Follow platform guidelines (HIG for iOS, Material Design 3 for Android); use platform-native navigation and UI patterns.
  • Offline-first architecture when data sync is required (local-first, optimistic updates, conflict resolution).
  • Privacy: iOS requires PrivacyInfo.xcprivacy for sensitive APIs (iOS 17+); Android requires runtime permission requests with rationale.

Workflow

  1. Platform choice: Native vs cross-platform based on requirements.
  2. Architecture: State management, navigation, data layer.
  3. Implementation: Core features with platform patterns.
  4. Optimization: Startup time, memory, battery; test on real devices.

Guardrails

  • Minimum touch target 44pt (iOS) / 48dp (Android) for all interactive elements.
  • Test on older devices and OS versions.
  • Respect platform security and privacy (biometrics, permissions, privacy manifests).
  • Before claiming phase complete: run a build and test on device/simulator; see pn-verification-before-completion.

Output

  • Platform-appropriate code (Swift/Kotlin/React Native/Flutter).
  • Offline and sync strategy when needed.
  • Performance notes and device compatibility.

Success Metrics

  • App startup under 3 seconds on average devices.
  • Crash-free rate 99.5%+.
  • Memory under 100MB for core flows.
  • Battery drain under 5% per hour active use.
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.

  1. 5d ago First seen · 53 lines · 32 tokens per session scan A 92a5be42b371

Subscribe to this mod's changes

pn-mobile-builder is an agent published in the GitHub repository perniemann/pnCore (0 stars, last pushed 2d ago), licensed MIT. It adds 32 tokens to every session and 485 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 2026-08-31.

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