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.
npx skills add Kasempiternal/axiom-v2 --skill ax-file-storagegit clone --depth 1 https://github.com/Kasempiternal/axiom-v2Wrote 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.
[](https://agentmods.dev/skills/kasempiternal/axiom-v2/ax-file-storage)<a href="https://agentmods.dev/skills/kasempiternal/axiom-v2/ax-file-storage"><img src="https://agentmods.dev/badge/skills/kasempiternal/axiom-v2/ax-file-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.
<a href="https://agentmods.dev/skills/kasempiternal/axiom-v2/ax-file-storage"><img src="https://agentmods.dev/badge/skills/kasempiternal/axiom-v2/ax-file-storage.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00032 | $0.04619 |
| Opus 5 | $0.00016 | $0.02309 |
| Sonnet 5 | $0.00006 | $0.00924 |
| Haiku 4.5 | $0.00003 | $0.00462 |
Grade A, and why
ax-file-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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 604 lines — stays where its author put it; the contents beside it link to each section on GitHub.
File Storage
Quick Patterns
Storage Location Decision
What are you storing?
├─ User-created content (photos, notes, recordings)
│ └─ Documents/ → backed up, never purged, visible in Files app
│
├─ App-generated data that CAN'T be recreated
│ └─ Application Support/ → backed up, never purged, hidden from user
│
├─ Downloaded/cached content that CAN be re-downloaded
│ └─ Caches/ → NOT backed up, purged under storage pressure
│
├─ Temporary files (in-progress operations)
│ └─ tmp/ → NOT backed up, purged aggressively on reboot
│
├─ Structured data (database)
│ └─ Application Support/ with appropriate protection level
│
└─ Small preferences/settings
└─ UserDefaults or NSUbiquitousKeyValueStore (cloud)
Directory Quick Reference
| Directory | Backed Up | Purged | User Visible | Use For |
|---|---|---|---|---|
Documents/ |
Yes | Never | Yes (Files) | User content |
Application Support/ |
Yes | Never | No | App data, databases |
Caches/ |
No | Under pressure | No | Re-downloadable content |
tmp/ |
No | Aggressively | No | Temporary operations |
Getting Directory URLs
// Documents
let documentsURL = FileManager.default.urls(
for: .documentDirectory, in: .userDomainMask
)[0]
// Application Support
let appSupportURL = FileManager.default.urls(
for: .applicationSupportDirectory, in: .userDomainMask
)[0]
try FileManager.default.createDirectory(
at: appSupportURL, withIntermediateDirectories: true
)
// Caches
let cachesURL = FileManager.default.urls(
for: .cachesDirectory, in: .userDomainMask
)[0]
// Temporary
let tmpURL = FileManager.default.temporaryDirectory
File Protection Levels
| Level | Accessible When | Use For |
|---|---|---|
.complete |
Device unlocked only | Sensitive user data |
.completeUnlessOpen |
After first open until lock | Files opened before lock |
.completeUntilFirstUserAuthentication |
After first unlock | Most app data, background tasks |
.none |
Always (even before unlock) | System resources, non-sensitive |
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.
- 12d ago First seen · 604 lines · 32 tokens per session scan A b987fc96854a
ax-file-storage is a skill published in the GitHub repository Kasempiternal/axiom-v2 (4 stars, last pushed 6mo ago), licensed MIT. It adds 32 tokens to every session and 4,619 once invoked, about $0.0002 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 2026-08-31.
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