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.
git clone --depth 1 https://github.com/bigdata2211it-web/ai-vault-skillsWrote 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/rules/bigdata2211it-web/ai-vault-skills/mybd-cryfs)<a href="https://agentmods.dev/rules/bigdata2211it-web/ai-vault-skills/mybd-cryfs"><img src="https://agentmods.dev/badge/rules/bigdata2211it-web/ai-vault-skills/mybd-cryfs/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/rules/bigdata2211it-web/ai-vault-skills/mybd-cryfs"><img src="https://agentmods.dev/badge/rules/bigdata2211it-web/ai-vault-skills/mybd-cryfs.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 | $0.00067 | $0.03320 |
| Opus 5 | $0.00034 | $0.01660 |
| Sonnet 5 | $0.00013 | $0.00664 |
| Haiku 4.5 | $0.00007 | $0.00332 |
Grade D, and why
mybd-cryfs scanned grade D with 2 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo apt update && sudo apt install cryfs Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
rm -rf ~/secrets How it starts
The opening of the file, as written. The whole thing — 344 lines — stays where its author put it; the contents beside it link to each section on GitHub.
mybd-cryfs — encrypted credentials vault with cryfs
Goal
Keep a folder of secrets (logins/passwords/TSV/JSON) encrypted at rest, usable on demand after entering a password, and auto-locked when idle. Works for a human and for an AI agent working under the human's explicit permission.
Threat model
| Threat | Covered |
|---|---|
| Another user/process reads plaintext files | Yes — ciphertext on disk only |
| AI agent reads secrets without permission | Yes — mountpoint empty until human opens |
| Disk theft | Yes — ciphertext useless without password |
| Password leaks via logs/history | Mitigated — pass via stdin/env, not config |
| Forgot to close | Yes — --unmount-idle N auto-unmounts |
| Forgot password | No recovery — AES/XChaCha key is derived from password |
| Disk failure without backup | No recovery — keep an external backup of the cipher dir |
How cryfs works
- Backend dir holds encrypted blocks (hex-named) +
cryfs.config. cryfs.configstores the encryption key, itself encrypted by your password (scrypt KDF).- Mounting decrypts the key, FUSE presents a plaintext view at the mountpoint.
- Unmounting drops the plaintext view; ciphertext stays on disk.
- Default cipher:
xchacha20-poly1305(AEAD). Block size 16 KiB. - File names, directory structure, sizes — all encrypted, nothing leaks.
Install
Linux — Debian/Ubuntu/Mint
sudo apt update && sudo apt install cryfs
Linux — Fedora/RHEL
sudo dnf install cryfs
If not in repos, use the upstream AppImage or build from source (see https://github.com/cryfs/cryfs).
Linux — Arch/Manjaro
sudo pacman -S cryfs
AUR alternative: cryfs-git.
Linux — NixOS
# configuration.nix
environment.systemPackages = with pkgs; [ cryfs ];
# FUSE is usually enabled; otherwise:
# boot.extraModulePackages = [ ];
Linux — Alpine
sudo apk add cryfs fuse
# ensure /dev/fuse exists and user is in the fuse/group that owns /dev/fuse
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.
- 9d ago First seen · 344 lines · 67 tokens per session scan D 7898195743c8
mybd-cryfs is a cursor rule published in the GitHub repository bigdata2211it-web/ai-vault-skills (2 stars, last pushed 2mo ago), licensed MIT. It adds 67 tokens to every session and 3,320 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it D with 2 findings (asks for root, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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