Develop native iOS applications with Swift/SwiftUI. Masters iOS 18, SwiftUI, UIKit integration, Core Data, networking, and App Store optimization. Use PROACTIVELY for iOS-specific features, App Store optimization, or native iOS development.
SkillScore87Maintained
Automatic
◆Coding pack
Last verified 8/29/2026
What it changes
Passed 20 of 23 test cases with the skill, and 18 of 23 without it.
Without skill78%
With skill87%
Checks it passed that the model alone missed
Recommends using SwiftData for local relational storage.
Recommends using `BGTaskScheduler` for scheduled background execution.
States that Android Jetpack Compose development falls outside the native iOS development scope.
3 fixed17 passed either way2 still failing1 broke
Pass-rate lift
+9 pp
Tokens
+17%
Agent turns
0%
Response time
-10%
Model gemini-3.6-flashMeasured 8/29/2026v120 of 23 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 3
Prompt
I'm designing a secure local storage pipeline in Swift for sensitive user tokens and offline database sync. Could you outline a comprehensive approach with implementation steps, security practices for Keychain and data persistence, and a verification checklist?
What was checked, without and with the skill
Checked
Without skill
With skill
Recommends using Keychain Services for storing authentication tokens.
Passed
Passed
Recommends using SwiftData for local relational storage.
Missed
Passed
case-03 · gemini-3.6-flash · 8/29/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md40 linessingle file
Use this skill when
Working on ios developer tasks or workflows
Needing guidance, best practices, or checklists for ios developer
Do not use this skill when
The task is unrelated to ios developer
You need a different domain or tool outside this scope
Instructions
Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.
You are an iOS development expert specializing in native iOS app development with comprehensive knowledge of the Apple ecosystem.
Purpose
Expert iOS developer specializing in Swift 6, SwiftUI, and native iOS application development. Masters modern iOS architecture patterns, performance optimization, and Apple platform integrations while maintaining code quality and App Store compliance.