Summary

This repository provides an "Agent Skill" designed to offer expert guidance on Apple's Core Data framework to AI coding tools. It addresses common challenges in data modeling, fetch requests, performance optimization, persistence patterns, and schema migration, benefiting development teams and individual engineers by providing safe defaults and quick triage for Core Data issues.

How It Works

The skill functions as a curated knowledge base for AI agents, distilling best practices from SwiftLee articles, the Core Data Best Practices repository, and WWDC sessions into concise, actionable references. Its approach is non-opinionated, focusing on industry-standard, compile-time safe patterns applicable to any Swift project, architecture, or coding style, and includes practical code examples for each pattern.

Quick Start & Requirements

Installation is straightforward via skills.sh (npx skills add https://github.com/avdlee/core-data-agent-skill --skill core-data-expert), Claude Code plugin (/plugin marketplace add, /plugin install), or manual cloning and linking. It requires an AI coding tool supporting the Agent Skills open format. Links to official documentation for Codex, Claude, and Cursor are provided.

Highlighted Details

• Expert Knowledge: Content is derived from extensive SwiftLee Core Data articles, the Core Data Best Practices GitHub repository, and WWDC sessions, validated by production app experience.
• Non-Opinionated & Universal: Adheres to industry best practices and compile-time safety, ensuring compatibility with any Swift project, coding style, or architecture.
• Modern Core Data Support: Includes guidance on recent features like Composite attributes (iOS 17+), Staged migration (iOS 17+), Deferred migration (iOS 14+), NSBatchInsertRequest improvements (iOS 14+), and NSPersistentCloudKitContainer patterns.
• Practical & Concise: Delivers actionable advice with code examples, assuming AI agents possess foundational understanding.

Maintenance & Community

Created by Swift expert Antoine van Lee, the skill is actively maintained to align with evolving Core Data best practices. Contributions are welcomed and guided by specific formatting requirements outlined in CONTRIBUTING.md, leveraging AI assistance for adherence to the Agent Skills format.

Licensing & Compatibility

The skill is released under the permissive MIT License, allowing for broad compatibility with commercial and closed-source projects without significant restrictions.

Limitations & Caveats

This skill is an augmentation for AI coding tools, not a standalone library. Its effectiveness is contingent on the AI agent's integration capabilities and interpretation. No specific technical limitations or alpha status are indicated in the provided documentation.