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 codebygarv/Ai-skills --skill cryptographic-practices-auditorgit clone --depth 1 https://github.com/codebygarv/Ai-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/skills/codebygarv/ai-skills/cryptographic-practices-auditor)<a href="https://agentmods.dev/skills/codebygarv/ai-skills/cryptographic-practices-auditor"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/cryptographic-practices-auditor.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 | $0.00032 | $0.00396 |
| Opus 5 | $0.00016 | $0.00198 |
| Sonnet 5 | $0.00006 | $0.00079 |
| Haiku 4.5 | $0.00003 | $0.00040 |
Grade A, and why
cryptographic-practices-auditor 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 5d 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.
What it actually says
Purpose
Audit source code and infrastructure configurations for cryptographic weaknesses: obsolete ciphers (MD5, SHA1, DES, RC4), hardcoded encryption keys, weak key derivation functions (KDFs), insecure random number generators, and flawed token signing.
When to Use
- Reviewing password hashing, encryption at rest, and secret token generation.
- Implementing asymmetric JWT signing (RS256 / EdDSA) or HMAC validation.
- Validating TLS cipher suite configurations and webhook signature verification.
What to Analyze
- Password Hashing: Use of Argon2id or bcrypt (cost factor >= 12) vs obsolete plain SHA256/MD5.
- Symmetric Encryption: AES-256-GCM / ChaCha20-Poly1305 (authenticated encryption) vs insecure AES-ECB / AES-CBC without HMAC.
- Random Number Generation: Cryptographically Secure PRNG (
crypto.randomBytes,crypto.getRandomValues) vsMath.random(). - Timing Attack Vulnerabilities: Constant-time string comparisons (
crypto.timingSafeEqual) for tokens, HMACs, and signatures. - Key Management: Storage of private keys in KMS / HSM vs hardcoded string constants in source control.
Output Format
- Cryptographic Findings Table: [Component | Current Algorithm | Flaw | NIST/OWASP Standard].
- Remediation Code: Drop-in secure cryptographic implementations.
- Key Rotation Guidance: How to rotate keys without invalidating active sessions.
Avoid
- Inventing custom home-grown encryption algorithms.
- Using
==or===for comparing HMAC hashes (susceptible to timing attacks).
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 34 lines · 32 tokens per session scan A 41e409129ef6
cryptographic-practices-auditor is a skill published in the GitHub repository codebygarv/Ai-skills (25 stars, last pushed 19d ago), licensed MIT. It adds 32 tokens to every session and 396 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 2026-09-03.
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