secskills-defense

secskills-defense is a plugin for Claude Code from trilwu/secskills. Its manifest loads nothing; the 22 skills it bundles cost 2,373 tokens per session together, scanned A, original, MIT.

A defensive security toolkit for digital forensics and incident response, the work of investigating breaches and suspicious activity. It covers alert handling, malware analysis, system forensics, cloud investigations, threat hunting, and detection rules.

In plain words
What is it for?
Use it for SOC alert triage, incident response, malware and phishing analysis, memory, disk, and network forensics, persistence hunting, cloud investigations, threat hunting, and writing Sigma, YARA, or Suricata detections.
Why use it?
It gives security teams a structured way to investigate alerts and compromises while preserving evidence and considering false positives. It also connects investigations with practical threat detection and vulnerability decisions.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit Use it for SOC alert triage, incident response, malware and phishing analysis…

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add trilwu/secskills/plugin install secskills-defense
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.

Clone the repo
git clone --depth 1 https://github.com/trilwu/secskills

Made for: Claude Code.

Wrote 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.

agentmods badge for secskills-defense

README.md
[![agentmods](https://agentmods.dev/badge/plugins/trilwu/secskills/secskills-defense.svg)](https://agentmods.dev/plugins/trilwu/secskills/secskills-defense)
Your own site
<a href="https://agentmods.dev/plugins/trilwu/secskills/secskills-defense"><img src="https://agentmods.dev/badge/plugins/trilwu/secskills/secskills-defense.svg" alt="Measured on agentmods" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 22 skills cost 2,373 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

secskills-defense 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.

secskills-defense/.claude-plugin/plugin.json · 24 lines

What it actually says

{
  "name": "secskills-defense",
  "version": "4.3.0",
  "description": "DFIR and detection built on preserve-first, base-rate discipline. 22 defensive security skills for SOC analysts, incident responders, and detection engineers: alert triage, malware and shellcode analysis, memory/disk/network forensics, phishing-email analysis, Windows endpoint DFIR, Linux persistence hunting, AWS/Azure/GCP/M365-Entra incident investigation, Kubernetes defense, cloud posture hardening, threat hunting, detection-as-code (Sigma/YARA/Suricata) with real false-positive analysis, risk-based vulnerability management, and threat intelligence. Every skill fact-checked against primary sources. Pairs with secskills-core. Use when investigating a compromise, running DFIR, triaging alerts, or building detections.",
  "author": {
    "name": "trilwu",
    "url": "https://github.com/trilwu"
  },
  "homepage": "https://github.com/trilwu/secskills",
  "repository": "https://github.com/trilwu/secskills",
  "license": "MIT",
  "keywords": [
    "security",
    "blue-team",
    "dfir",
    "incident-response",
    "threat-hunting",
    "detection-engineering",
    "malware-analysis",
    "forensics",
    "threat-intelligence"
  ]
}
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. 7d ago First seen · 24 lines scan A 9f4a811e7395

Subscribe to this mod's changes

secskills-defense is a plugin published in the GitHub repository trilwu/secskills (135 stars, last pushed 2d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.