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Millie Sec

Category: Security  ·  Sub-category: forensics  ·  Last updated:
type:audittype:review
Autonomous research-driven application and repository security hardening skill for AI coding agents. Use when asked to secure, harden, audit, pentest, threat-model, remediate, verify, or security-review a new or existing software project. Millie Security automatically creates an isolated security workspace for existing projects, establishes a security baseline and threat model, routes stack-appropriate SAST/SCA/secrets/IaC/container/mobile/AI/security tools, performs authorized dynamic validation in isolated or explicitly authorized environments, triages and independently verifies findings, fixes root causes, adds regression tests and secure defaults, re-runs evidence-bearing checks, adds CI/CD security gates, and writes durable security documentation and residual-risk reports. The user should not need to manually enumerate the security pipeline.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Millie Security is a secure-software engineer, application-security architect, threat modeler, code auditor, dependency/supply-chain reviewer, authorized penetration tester, remediation engineer, verification engineer, and DevSecOps reviewer.

Use millie-sec.
Secure this project.
Harden this application.
Run the full security pipeline.

What this skill does

Millie Sec is a community-contributed Claude Code skill in the forensics sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/millie-sec/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when asked to secure, harden, audit, pentest, threat-model, remediate, verify, or security-review a new or existing software project. Millie Security automatically creates an isolated security workspace for existing projects, establishes a security baseline and threat model, routes stack-appropriate SAST/SCA/secrets/IaC/container/mobile/AI/security tools, performs authorized dynamic validation in isolated or explicitly authorized environments, triages and independently verifies findings, fixes root causes, adds regression tests and secure defaults, re-runs evidence-bearing checks, adds CI/CD security gates, and writes durable security documentation and residual-risk reports.

Who uses this skill

The Millie Sec Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/millie-sec
curl -L https://claudskills.com/skills/millie-sec/SKILL.md \
  -o ~/.claude/skills/millie-sec/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/millie-sec/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/millie-sec/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\millie-sec\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Millie Sec Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/millie-sec/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Millie Sec skill do?
Autonomous research-driven application and repository security hardening skill for AI coding agents. Use when asked to secure, harden, audit, pentest, threat-model, remediate, verify, or security-review a new or existing software project. Millie Security automatically creates an isolated security workspace for existing projects, establishes a security baseline and threat model, routes stack-appropriate SAST/SCA/secrets/IaC/container/mobile/AI/security tools, performs authorized dynamic validation in isolated or explicitly authorized environments, triages and independently verifies findings, fixes root causes, adds regression tests and secure defaults, re-runs evidence-bearing checks, adds CI/CD security gates, and writes durable security documentation and residual-risk reports. The user should not need to manually enumerate the security pipeline.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Millie Sec skill?
Use Millie Sec when your Claude Code task falls under the Security category — specifically in the forensics area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Millie Sec" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Millie Sec skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Millie Sec is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ClaudSkills. (2026). Millie Sec [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/millie-sec/
BibTeX
@misc{millie-sec-2026,
  author    = {ClaudSkills},
  title     = {Millie Sec [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/millie-sec/}
}

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Security scan

Grade A · scanned 2026-09-28 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/millie-sec/#security)

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More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

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