axiom-storage

axiom-storage is a skill for Claude Code, Codex from ComeOnOliver/skillshub. It costs 68 tokens per session (4,275 once invoked), scanned A, original, MIT.

An iOS storage guide for choosing between databases, files, local storage, and cloud services. It also covers where app files belong and how data synchronisation fits into the choice.

In plain words
What is it for?
Use it when starting an iOS project, planning data storage, comparing SwiftData, SQLite, CloudKit, and iCloud Drive, or moving from one storage approach to another.
Why use it?
It helps avoid losing data, putting files in the wrong location, or choosing a storage system that does not suit offline use or synchronisation needs.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it when starting an iOS project, planning data storage, comparing SwiftData, SQLite, CloudKit, and iCloud Drive, or moving from one storage approach to another.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/comeonoliver/skillshub/axiom-storage
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add ComeOnOliver/skillshub --skill axiom-storage
Clone the repo
git clone --depth 1 https://github.com/ComeOnOliver/skillshub

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for axiom-storage

README.md
[![agentmods](https://agentmods.dev/badge/skills/comeonoliver/skillshub/axiom-storage/github.svg)](https://agentmods.dev/skills/comeonoliver/skillshub/axiom-storage)
Your own site
<a href="https://agentmods.dev/skills/comeonoliver/skillshub/axiom-storage"><img src="https://agentmods.dev/badge/skills/comeonoliver/skillshub/axiom-storage/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for axiom-storage

Your own site · 80×15
<a href="https://agentmods.dev/skills/comeonoliver/skillshub/axiom-storage"><img src="https://agentmods.dev/badge/skills/comeonoliver/skillshub/axiom-storage.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,275 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00068 $0.04275
Opus 5 $0.00034 $0.02138
Sonnet 5 $0.00014 $0.00855
Haiku 4.5 $0.00007 $0.00428

Measured 9d ago against content hash becbee2d6d22, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

axiom-storage scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/CharlesWiltgen/Axiom/axiom-storage/SKILL.md · 565 lines

How it starts

The opening of the file, as written. The whole thing — 565 lines — stays where its author put it; the contents beside it link to each section on GitHub.

iOS Storage Guide

Purpose: Navigation hub for ALL storage decisions — database vs files, local vs cloud, specific locations iOS Version: iOS 17+ (iOS 26+ for latest features) Context: Complete storage decision framework integrating SwiftData (WWDC 2023), CKSyncEngine (WWDC 2023), and file management best practices

When to Use This Skill

Use this skill when:

  • Starting a new project and choosing storage approach
  • Asking "where should I store this data?"
  • Deciding between SwiftData, Core Data, SQLite, or files
  • Choosing between CloudKit and iCloud Drive for sync
  • Determining Documents vs Caches vs Application Support
  • Planning data architecture for offline/online scenarios
  • Migrating from one storage solution to another
  • Debugging "files disappeared" or "data not syncing"

Do NOT use this skill for:

  • SwiftData implementation details (use axiom-swiftdata skill)
  • SQLite/GRDB specifics (use axiom-sqlitedata or axiom-grdb skills)
  • CloudKit sync implementation (use axiom-cloudkit-ref skill)
  • File protection APIs (use axiom-file-protection-ref skill)

Related Skills:

  • Existing database skills: axiom-swiftdata, axiom-sqlitedata, axiom-grdb
  • New file skills: axiom-file-protection-ref, axiom-storage-management-ref, axiom-storage-diag
  • New cloud skills: axiom-cloudkit-ref, axiom-icloud-drive-ref, axiom-cloud-sync-diag

Core Philosophy

"Choose the right tool for your data shape. Then choose the right location."

Storage decisions have two dimensions:

  1. Format: How is data structured? (Queryable records vs files)
  2. Location: Where is it stored? (Local vs cloud, which directory)

Getting the format wrong forces workarounds. Getting the location wrong causes data loss or backup bloat.


The Complete Decision Tree

Level 1: Format — What Are You Storing?

What is the shape of your data?

├─ STRUCTURED DATA (queryable records, relationships, search)
│   Examples: User profiles, task lists, notes, contacts, transactions
│   → Continue to "Structured Data Path" below
│
└─ FILES (documents, images, videos, downloads, caches)
    Examples: Photos, PDFs, downloaded content, thumbnails, temp files
    → Continue to "File Storage Path" below

Read the full file on GitHub · 565 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 565 lines · 68 tokens per session scan A becbee2d6d22

Subscribe to this mod's changes

axiom-storage is a skill published in the GitHub repository ComeOnOliver/skillshub (63 stars, last pushed 2mo ago), licensed MIT. It adds 68 tokens to every session and 4,275 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.