Borrowing it
Nothing to install: this file belongs to khr898/ntfsmac. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/khr898/ntfsmac/main/CLAUDE.mdgit clone --depth 1 https://github.com/khr898/ntfsmacWrote 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/instructions/khr898/ntfsmac/claude-md)<a href="https://agentmods.dev/instructions/khr898/ntfsmac/claude-md"><img src="https://agentmods.dev/badge/instructions/khr898/ntfsmac/claude-md.svg" alt="Measured on agentmods" 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 | $0.02316 | $0.02316 |
| Opus 5 | $0.01158 | $0.01158 |
| Sonnet 5 | $0.00463 | $0.00463 |
| Haiku 4.5 | $0.00232 | $0.00232 |
Grade A, and why
ntfsmac CLAUDE.md 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 7d 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 — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ntfsmac
New here? README.md has install/usage; CONTRIBUTING.md has human setup steps. This file (mirrored at AGENTS.md) is AI-agent instructions — read it before generating code in this repo, human or agent.
NTFS read/write on Apple Silicon macOS, no kernel extension, no SIP modification. Wraps anylinuxfs (libkrun microVM running ntfs-3g, exported to macOS over NFS on a host-only vmnet bridge). CLI first, GUI second — build order is fixed, don't jump ahead.
Full spec: docs/dev/PLAN.md (architecture, phases, build steps) and docs/dev/GUI-PLAN.md (SwiftUI menu-bar app, button-level spec). Read the relevant phase section before writing code for it — don't work from memory of what these say. ui/prototype.html (the original static HTML/SVG design comp) was removed 2026-07-13 — the already-built SwiftUI screens are now the visual source of truth for colors, radii, spacing, and the vibrancy/blur recipe. Match what's already built; don't re-design.
Non-negotiables (do not re-litigate)
- Driver: ntfs-3g default. ntfs3 is opt-in only via
--fs-driver ntfs3, never via an-otoken (it's inert there). - Transport: NFS only, over vmnet-helper host-only
/30bridge. No SMB. No loopback/127.94.0.1design — that's dead, don't resurrect it. - NFS mount mode stays
soft— never switch tohard, it's what prevents a kernel panic on hot-unplug. - Signing: ad-hoc only (
codesign -s -). No paid Apple Developer account, no notarization. This is why the GUI is DMG-only (never a Homebrew cask) and the CLI is a formula in the project's own tap (never homebrew-core). - Every control that mounts/unmounts/touches pf/route goes through the SMJobBless XPC helper — never a raw
sudoshell-out from Swift UI code. - Device names validated against
^disk[0-9]+s[0-9]+$before any shell invocation, in both CLI and GUI/helper. - Platform: Apple Silicon only. Don't add Intel fallback paths.
- Security and connection stability outrank speed. Speed tuning (rsize/wsize/async export) is opt-in and documented as risk, never silently defaulted on.
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.
- 7d ago First seen · 82 lines · 2,316 tokens per session scan A b1733e9cb498
ntfsmac CLAUDE.md is an instructions file published in the GitHub repository khr898/ntfsmac (570 stars, last pushed 3d ago), licensed MIT. It adds 2,316 tokens to every session, about $0.0116 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 2026-08-30.
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