swift-library-design

Design Swift library APIs with protocols, associated types, and result builders.

62|5|Updated Jan 21, 2026

Search Tags:#design #performance #library #API design #Swift #protocol-oriented #builder-pattern

Ready to run

npx skills add https://github.com/Joannis/claude-skills --skill swift-library-design

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: swift-library-design
Source: https://github.com/Joannis/claude-skills/tree/main/swift-library-design
Command: npx skills add https://github.com/Joannis/claude-skills --skill swift-library-design

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Swift Library Design helps engineers craft robust, reusable libraries and frameworks by applying protocol-oriented design, type-safe APIs, and performance-minded patterns.

Core Features & Use Cases

Protocol-oriented API design with Associated Types to enable flexible, testable compositions.
Compile-time safety and extension via protocols, noncopyable types, and Result Builders for DSLs.
Performance-first API design using inlining hints and zero-copy patterns, with design patterns like ResponseGenerator and builder patterns.

Quick Start

Propose a small Swift library API using Protocols with Associated Types and a Result Builder to demonstrate a clean, composable interface.

Frequently Asked Questions about swift-library-design

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I design a Swift library API using protocol-oriented patterns?▼

Design a Swift library API by applying Protocols with Associated Types to enable flexible, testable compositions. This protocol-oriented approach ensures compile-time safety while allowing extensible public interfaces across module boundaries.

What's the best way to build a type-safe DSL in Swift?▼

The best way to build a type-safe DSL in Swift is by using Result Builders. This pattern allows you to construct complex, composable hierarchies declaratively while enforcing compile-time safety constraints within your library's public API.

How does Swift handle noncopyable types in public API design?▼

Swift handles noncopyable types by enforcing strict ownership rules across module boundaries. Applying noncopyable API patterns in your public interfaces guarantees zero-copy performance and prevents unintended resource duplication at compile time.

Can I optimize Swift library performance across module boundaries?▼

You can optimize Swift library performance by applying inlining hints and zero-copy patterns across module boundaries. This performance-first API design minimizes reference counting overhead and ensures fast execution for public framework components.

When do I need protocols with associated types for a Swift framework?▼

You need protocols with associated types when building a Swift framework that requires flexible, type-safe compositions. They allow your public API to define flexible contracts that enable extensible and testable designs without sacrificing compile-time safety.

What are the limitations of using result builders for Swift API design?▼

Result builders require strict compile-time syntax conformity, limiting dynamic runtime composition. While they excel at building declarative DSLs, complex control flow or runtime-dependent logic within the Swift library API may fall outside their safe, static builder pattern capabilities.