security-engineering-quickref

A quick reference for security engineering, covering encryption, key derivation, trust chains, signing keys, multi-factor authentication, secret handling, software supply-chain trust, and physical threats.

In plain words
What is it for?
Use it for cryptography choices, authentication, key and secret handling, trusted software delivery, degraded operation, and physical-security concerns.
Why use it?
It helps an agent select appropriate security practices and account for risks when designing or reviewing systems.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/jmagly/kintsugi-usb/security-engineering-quickref
Any agent
npx skills add jmagly/kintsugi-usb --skill security-engineering-quickref
Clone the repo
git clone --depth 1 https://github.com/jmagly/kintsugi-usb

Made for: Claude Code, Codex.

Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,992 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.00076 $0.01992
Opus 5 $0.00038 $0.00996
Sonnet 5 $0.00015 $0.00398
Haiku 4.5 $0.00008 $0.00199

Measured 2d ago against content hash caff95d3fa7e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

security-engineering-quickref scanned grade A with 1 finding 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 2d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| `ci-workflow-audit` | tag-pinned actions/containers, bare `:latest`, PR-triggered jobs with `secrets.*`, curl-pipe-shell without hash checks |
.agents/skills/security-engineering-quickref/SKILL.md · 168 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

1 file 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.

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. 2d ago First seen · 168 lines · 76 tokens per session scan A caff95d3fa7e

Subscribe to this mod's changes

security-engineering-quickref is a skill published in the GitHub repository jmagly/kintsugi-usb (11 stars, last pushed 1mo ago), with no licence file. It adds 76 tokens to every session and 1,992 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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