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AgentCompany/builtin-skills/iOS-Dev/ios-swift-development/SKILL.md
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ZacharyZhang-NY e74dafcd36 Silence render-disposed spam, unbreak bundled skills, drop board wake
Three independently ugly bugs that all fed the same log flood:

* Electron's `WebFrameMain.send` writes every "Render frame was disposed"
  to stderr via `console.error`. When the worker fans a second
  agent-event past a reloading renderer, we produced thousands of
  identical lines and stalled the main loop on stderr I/O. Added a
  `mainFrame.detached` guard so the send is short-circuited before
  Electron's own catch block fires, and installed a targeted filter in
  `suppress-warnings.ts` (now actually imported from the entry point)
  so the specific `console.error("Error sending from webFrameMain:"…)`
  noise never reaches the terminal. Any other payload still surfaces.

* `dispatchAgentMessage` accepted the human-reader sentinel as a wake
  target when an agent replied to `__board__` — `wakeAgentIfPossible`
  then called `db.getAgent("__board__")`, threw, and the dispatcher
  kept repeating on every send. Strip `HUMAN_SENDER_ID` at
  `resolveMessageWakeTargets`, and keep a defense-in-depth guard in the
  heartbeat so a stray caller (future automation fan-out) cannot
  reintroduce the crash.

* Pi's skills loader rejects any SKILL.md whose frontmatter `name`
  diverges from its parent directory. The four bundled `my-writing-style`
  copies declared `name: writing-style-skill`, so every install emitted
  a warning and dropped the skill. They also lived as orphan gitlinks
  (mode 160000 without .gitmodules), and the global `*.md` gitignore
  hid every other SKILL.md from version control. Fixed the frontmatter
  to match the dir, converted the dangling submodules to plain trees,
  and allowlisted `builtin-skills/**/*.md` so a fresh clone carries the
  catalogue instead of silently losing it.
2026-04-20 08:13:48 -04:00

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Markdown

---
name: ios-swift-development
description: >
Develop native iOS apps with Swift. Covers MVVM architecture, SwiftUI,
URLSession for networking, Combine for reactive programming, and Core Data
persistence.
---
# iOS Swift Development
## Table of Contents
- [Overview](#overview)
- [When to Use](#when-to-use)
- [Quick Start](#quick-start)
- [Reference Guides](#reference-guides)
- [Best Practices](#best-practices)
## Overview
Build high-performance native iOS applications using Swift with modern frameworks including SwiftUI, Combine, and async/await patterns.
## When to Use
- Creating native iOS applications with optimal performance
- Leveraging iOS-specific features and APIs
- Building apps that require tight hardware integration
- Using SwiftUI for declarative UI development
- Implementing complex animations and transitions
## Quick Start
Minimal working example:
```swift
import Foundation
import Combine
struct User: Codable, Identifiable {
let id: UUID
var name: String
var email: String
}
class UserViewModel: ObservableObject {
@Published var user: User?
@Published var isLoading = false
@Published var errorMessage: String?
private let networkService: NetworkService
init(networkService: NetworkService = .shared) {
self.networkService = networkService
}
@MainActor
func fetchUser(id: UUID) async {
isLoading = true
errorMessage = nil
// ... (see reference guides for full implementation)
```
## Reference Guides
Detailed implementations in the `references/` directory:
| Guide | Contents |
|---|---|
| [MVVM Architecture Setup](references/mvvm-architecture-setup.md) | MVVM Architecture Setup |
| [Network Service with URLSession](references/network-service-with-urlsession.md) | Network Service with URLSession |
| [SwiftUI Views](references/swiftui-views.md) | SwiftUI Views |
## Best Practices
### ✅ DO
- Use SwiftUI for modern UI development
- Implement MVVM architecture
- Use async/await patterns
- Store sensitive data in Keychain
- Handle errors gracefully
- Use @StateObject for ViewModels
- Validate API responses properly
- Implement Core Data for persistence
- Test on multiple iOS versions
- Use dependency injection
- Follow Swift style guidelines
### ❌ DON'T
- Store tokens in UserDefaults
- Make network calls on main thread
- Use deprecated UIKit patterns
- Ignore memory leaks
- Skip error handling
- Use force unwrapping (!)
- Store passwords in code
- Ignore accessibility
- Deploy untested code
- Use hardcoded API URLs