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Design idiomatic Swift code
Use protocols, structs, enums, generics, error handling, optionals, access control, and API naming suited to the project.
Swift application and package development
CategorySoftware Development
Swift Codex Skills
Swift Codex Skills help Codex build dependable Swift code for Apple platforms, servers, command-line tools, and packages. Download the skills for Swift concurrency, value semantics, protocols, Swift Package Manager, testing, performance, interoperability, documentation, and platform-aware builds.
SwiftSwiftPMConcurrencyTesting
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task: complete swift application and package development task
inspect:
- requirements and context
- existing standards
- failure and edge cases
verify: outputs + checks + handoffWhy a specialist workflow matters
Swift code can compile in one target yet fail elsewhere when actor isolation, availability, ownership, package products, and platform APIs are not considered together.
Swift projects combine language rules with package or Xcode build settings, supported platforms, dependencies, tests, and deployment requirements.
These skills make Codex inspect those constraints before choosing APIs, concurrency patterns, data models, and verification commands.
What the downloadable skills can do
What Swift Codex Skills can help accomplish
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Handle modern concurrency
Work with async and await, actors, tasks, cancellation, Sendable boundaries, isolation, and main-thread UI requirements.
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Maintain packages and targets
Edit Package.swift, products, targets, resources, dependencies, plugins, conditional compilation, and supported platforms.
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Test and ship confidently
Add Swift Testing or XCTest coverage, run package and platform builds, diagnose compiler issues, measure performance, and generate documentation.
A repeatable working process
How the swift application and package development workflow moves from request to verified result
The steps keep context, implementation, and verification visible so the result can be reviewed and repeated.
workflow.statusREADY
Context → Plan → Work → Verify
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Inspect package or project metadata
Confirm Swift version, platforms, targets, products, dependencies, build settings, test framework, and public compatibility.
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Model the behavior first
Define data ownership, mutability, errors, concurrency boundaries, protocol contracts, and platform-specific branches.
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Implement in the project’s style
Preserve API availability, value semantics, isolation rules, package layout, and existing naming conventions.
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Build and test relevant targets
Run formatting if configured, compile supported configurations, execute focused and full tests, and inspect warnings or sanitizer output.
Useful across real projects
Where Swift Codex Skills fit
The workflow adjusts to the project, audience, tools, and risk while preserving the same quality standard.
Apple applications
Build shared logic for iOS, macOS, watchOS, tvOS, and visionOS while respecting availability.
Server-side Swift
Develop services, networking, persistence, structured concurrency, Linux builds, and deployment code.
Swift packages
Create libraries, executables, macros, plugins, resources, documentation, and multi-platform releases.
Interoperability
Work across Objective-C, C, and C++ boundaries with explicit ownership, types, and platform constraints.
Common requests
Tasks these skills can handle
Start with one defined outcome and provide the source material, constraints, and checks that matter.
01Create a Swift package
02Design a public Swift API
03Fix actor isolation errors
04Add async cancellation
05Write Swift tests
06Support multiple platforms
07Improve performance
08Generate DocC documentation
Who benefits most
Who Is This For?
These skills are designed for people who need dependable swift application and package development work with a visible process.
Swift developers
Build clear, safe code aligned with the project’s language and platform constraints.
Apple platform teams
Share models, services, concurrency, tests, and packages across product targets.
Server developers
Maintain Linux-compatible services and packages with dependable async behavior.
Library authors
Protect source compatibility, documentation, performance, and multi-platform releases.
Good to know:
The skills cannot sign or submit applications, access unavailable Apple services, or prove behavior on devices and platform versions that are not part of the test environment.
Set up the workflow
Installation Guide
Install the complete skill folder and add the project-specific context before beginning.
Download the Swift skill folder
Keep language, concurrency, package, platform, testing, and documentation guidance together.
Install it with the repository
Project scope lets the workflow read Package.swift, Xcode files, supported platforms, tests, and conventions.
Record compatibility requirements
Specify Swift and toolchain versions, operating systems, deployment targets, dependencies, and public API promises.
List build and test commands
Include package, Xcode, simulator, Linux, sanitizer, performance, formatting, and documentation checks as applicable.
Before you download
Frequently Asked Questions
Practical answers about capabilities, limits, setup, and review.
Do the skills support Swift Package Manager?+
Yes. They cover manifests, targets, products, resources, dependencies, builds, tests, and package releases.
Can they help with Swift concurrency?+
Yes, including actor isolation, Sendable requirements, tasks, cancellation, async sequences, and main-actor work.
Do they support XCTest and Swift Testing?+
Yes. The workflow follows the framework and versions already used by the project.
Can they write cross-platform Swift?+
Yes, when supported platforms and conditional behaviors are clearly defined and available to build.
Will they modify public APIs safely?+
They inspect call sites, compatibility expectations, documentation, and tests before proposing a breaking change.
Make the work repeatable
Give Codex a Swift workflow that respects ownership, concurrency, platforms, packages, and the compiler evidence that holds them together.
Clear context. Purposeful work. Relevant checks. A result others can understand.