Fe2-O3

@fe2-o3 source repo

6 skills
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3 hours ago last updated

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Swift Concurrency · fe2-o3 bundle
Load this whenever Swift concurrency code is being written, fixed, migrated, or reviewed. Diagnoses and fixes Swift Concurrency issues (tasks, actors, @MainActor, Sendable, data races, thread safety, concurrency-related compiler and linter warnings), refactors callback-based code to async/await, guides Swift 6/6.2 migration, AND reviews Swift code for concurrency correctness, modern API usage, and async/await pitfalls. If the code touches `async`, `await`, `actor`, `Task`, `Sendable`, or a strict-concurrency diagnostic, check here first — don't guess at isolation rules from memory.

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Swiftui · fe2-o3 bundle
Use for anything SwiftUI on iOS or macOS -- writing, reviewing, or refactoring views; state management (@State/@Observable/@Bindable/environment); gesture composition (simultaneous/sequenced/exclusive); adaptive layout (ViewThatFits/AnyLayout/size classes); architecture choice (MVVM vs TCA vs vanilla); navigation and presentation (NavigationStack, sheets, Inspector); modern API adoption and Liquid Glass; accessibility and HIG compliance; performance and maintainability review; or Instruments `.trace` capture/analysis for hangs, hitches, and excessive view updates. Reach for this before improvising SwiftUI guidance from memory -- it consolidates five prior overlapping skills and is more current and more complete than ad hoc knowledge.

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Swift Data · fe2-o3 bundle
Use for ANY Swift/iOS/macOS data persistence work: persisting data, models, or a database; Core Data (NSManagedObject, NSPersistentContainer, NSFetchedResultsController, stack setup, threading, migrations, NSPersistentCloudKitContainer/CloudKit sync); SwiftData (@Model, @Query, @Relationship, ModelContainer, predicates); SQLiteData (@Table, @FetchAll, @FetchOne, @Fetch macros, CloudKit private-database sync); GRDB (raw SQL, DatabaseQueue/DatabasePool, complex joins, window functions, ValueObservation). Also use when deciding WHICH persistence framework to use, migrating between them, or reviewing/writing/debugging persistence code in an existing project. Consolidates four prior skills (core-data-expert, swiftdata-pro, sqlite-data, grdb) into one — always load this first for persistence work rather than guessing at framework-specific APIs from memory.

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Write Swift · fe2-o3
How to write modern Swift well — modeling with value types, Swift 6 data-race safety and approachable concurrency (@concurrent, main-actor-by-default, actors, task groups), protocols and generics (some vs any), API design, performance and ARC, Swift Testing, macros, and the modern language features agents don't know about yet. Use when writing, reviewing, or migrating Swift, or when a concurrency error, a hang, a data race, a retain cycle, or a performance problem needs fixing.

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Xcode Build · fe2-o3 bundle
Optimize Xcode build times end-to-end -- benchmark clean/incremental/cached-clean builds, diagnose slow compilation and Swift type-checking, audit project configuration/build settings/schemes/script phases, and apply approved fixes with re-benchmarking to prove the win. This is the single entrypoint for ALL Xcode build-speed work -- use it whenever a developer wants a full build optimization pass, asks to speed up Xcode builds, wants to benchmark or measure build performance, asks "how long do my builds take" or wants before/after numbers, reports slow compilation, expensive type-checking, long CompileSwiftSources/SwiftEmitModule/"Planning Swift module" tasks, wants a build settings or scheme/script-phase audit, or has an approved optimization plan ready to implement. Always reach for this skill first for Xcode build-performance work rather than improvising ad hoc fixes.

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Swift Testing · fe2-o3 bundle
Use whenever writing, reviewing, improving, migrating, or debugging Swift tests. Covers @Test,

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6 published skills