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Axiom Data

charleswiltgen/axiom

This is the comprehensive data persistence skill you'd reach for anytime you're touching databases, storage, or serialization in Swift. It covers the full stack: SwiftData, Core Data, GRDB, SQLiteData, CloudKit sync, iCloud Drive, Codable, and Keychain. The decision tree is genuinely helpful for navigating between frameworks, and the automated auditors catch real production disasters like unsafe migrations and thread confinement violations. Particularly strong on migration safety across all database layers, which is where most apps eventually burn themselves. If you're storing anything more complex than UserDefaults, this has the reference you need. The cross-references to axiom-security for encryption and keychain work keep the scope clean.

skills.sh installs
1.4K
GitHub stars
1.3K
last updated
Aug 21, 2026
View on GitHub

Install

$ npx -y skills add charleswiltgen/axiom --skill axiom-data --agent claude-code

Installs into .claude/skills of the current project.

Files

Data & Persistence

You MUST use this skill for ANY data persistence, database, storage, CloudKit, or serialization work.

Auditors are skills here. Where this router says "Launch some-auditor agent", invoke the matching Codex skill instead — same procedure, no Claude Code agent required.

Available: axiom-audit-codable, axiom-audit-core-data, axiom-audit-database-schema, axiom-audit-grdb-performance, axiom-audit-icloud, axiom-audit-storage, axiom-audit-swiftdata.

The ones that shell out — builds, tests, simulators, crash symbolication — need shell access to run.

When to Use

Use this skill when working with:

  • Databases (SwiftData, Core Data, GRDB, SQLiteData)
  • Schema migrations
  • CloudKit sync
  • File storage (iCloud Drive, local storage)
  • Data serialization (Codable, JSON)
  • Storage strategy decisions
  • Keychain / secure credential storage
  • Encryption, signing, key management (CryptoKit)

Quick Reference

SKILL.md on GitHub

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Details

Repository
github.com/charleswiltgen/axiom
Categories
Backend & APIs, Databases
First seen
Jun 3, 2026

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