# Axiom Data

Use when working with ANY data persistence, database, storage, CloudKit, migration, or...

- Repository: https://github.com/CharlesWiltgen/Axiom (1242 stars)
- Category: Data and ML
- License: MIT
- Last updated: 2026-10-31
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add CharlesWiltgen/Axiom --skill axiom-data -g -a claude-code -y`
Codex: `npx skills add CharlesWiltgen/Axiom --skill axiom-data -g -a codex -y`
Cursor: `npx skills add CharlesWiltgen/Axiom --skill axiom-data -g -a cursor -y`
Gemini CLI: `npx skills add CharlesWiltgen/Axiom --skill axiom-data -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add CharlesWiltgen/Axiom`

## Description

Use when working with ANY data persistence, database, storage, CloudKit, migration, or serialization in an Apple app. Covers SwiftData, Core Data, GRDB, SQLite, Realm, CloudKit sync, file storage, Codable, migrations.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Data & Persistence

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

<!-- AXIOM_AUDITOR_INLINE_BEGIN, auto-maintained by scripts/build-inlined-auditors.ts; do not hand-edit -->
> **Can't launch Axiom agents?** Where this router sends you to an agent, follow its procedure inline. Over MCP, `axiom_get_agent` returns it; elsewhere, read its file below, which needs only file search and read.
>
> Available here: `skills/codable-auditor.md`, `skills/core-data-auditor.md`, `skills/database-schema-auditor.md`, `skills/grdb-performance-auditor.md`, `skills/icloud-auditor.md`, `skills/storage-auditor.md`, `skills/swiftdata-auditor.md`.
>
> For any other agent, over MCP `axiom_get_agent` returns it too; run its xclog, xcsym and xcprof steps with the `axiom_xclog_*`, `axiom_xcsym_*` and `axiom_xcprof_*` tools. Elsewhere, search Axiom's skills for `skills/<agent>.md`; if there is none, do that work yourself with this suite's skills, using any Axiom tool on your `PATH`.
<!-- AXIOM_AUDITOR_INLINE_END -->

## 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

The rest: https://github.com/CharlesWiltgen/Axiom/blob/HEAD/.claude-plugin/plugins/axiom/skills/axiom-data/SKILL.md