Swift Networking

If you're working with Network.framework instead of URLSession, this covers the essentials: setting up NWConnection for TCP/UDP, handling connection state transitions, and avoiding the usual mistakes like blocking the main thread or ignoring network switches between WiFi and cellular. It includes migration guidance from BSD sockets and CFSocket, plus specific coverage of iOS 26's new NetworkConnection API with structured concurrency. The troubleshooting reference is helpful when you're staring at connection timeouts or TLS failures. Most useful for peer-to-peer apps, gaming, or custom protocols where you need lower-level control than HTTP gives you.

skills.sh installs: 162
GitHub stars: 233
last updated: Aug 21, 2026

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Install

$ npx -y skills add johnrogers/claude-swift-engineering --skill swift-networking --agent claude-code

Installs into .claude/skills of the current project.

Files

Swift Networking

Network.framework is Apple's modern networking API for TCP/UDP connections, replacing BSD sockets with smart connection establishment, user-space networking, and seamless mobility handling.

Reference Loading Guide

ALWAYS load reference files if there is even a small chance the content may be required. It's better to have the context than to miss a pattern or make a mistake.

Reference	Load When
Getting Started	Setting up NWConnection for TCP/UDP, choosing between APIs
Connection States	Handling `.waiting`, `.ready`, `.failed` transitions
iOS 26+ Networking	Using NetworkConnection with async/await, TLV framing, Coder protocol
Migration Guide	Moving from sockets, CFSocket, SCNetworkReachability, URLSession
Troubleshooting	Debugging timeouts, TLS failures, connection issues