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Harden K8s

Category: Security  ·  Sub-category: identity-access  ·  Last updated:
tool:k8stype:audit
Defensive methodology for Kubernetes cluster attacks: over-privileged RBAC and stolen service-account tokens driving the API server, interactive access to running workloads, and attacker-deployed or privileged pods used to escape to the node and persist (MITRE ATT&CK T1078, T1552.007, T1609, T1610, T1525, T1611, T1613, T1053.007). Signals live in the Kubernetes API server audit log and its managed equivalents (EKS control-plane logs, GKE Cloud Audit Logs, AKSAudit tables) plus Falco runtime events. Gives the defender view of each path, the audit fields to alert on, a hunt, and RBAC, admission-control, and audit-logging hardening mapped to the UMBRASEC guide. Use when hardening a Kubernetes cluster, reviewing RBAC roles and bindings, designing PodSecurity or Kyverno/Gatekeeper admission policy, tuning API server audit logging, hunting a privileged-pod foothold, or triaging an unexpected clusterrolebinding change or pods/exec event.
Security AStatic scan found no risk patternsHow grading works ›

What this skill does

Harden K8s is a community-contributed Claude Code skill in the identity-access sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/harden-k8s/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when hardening a Kubernetes cluster, reviewing RBAC roles and bindings, designing PodSecurity or Kyverno/Gatekeeper admission policy, tuning API server audit logging, hunting a privileged-pod foothold, or triaging an unexpected clusterrolebinding change or pods/exec event.

Who uses this skill

The Harden K8s 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 211,000+ 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/harden-k8s
curl -L https://claudskills.com/skills/harden-k8s/SKILL.md \
  -o ~/.claude/skills/harden-k8s/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/harden-k8s/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/harden-k8s/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\harden-k8s\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 Harden K8s Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/harden-k8s/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Harden K8s skill do?
Defensive methodology for Kubernetes cluster attacks: over-privileged RBAC and stolen service-account tokens driving the API server, interactive access to running workloads, and attacker-deployed or privileged pods used to escape to the node and persist (MITRE ATT&CK T1078, T1552.007, T1609, T1610, T1525, T1611, T1613, T1053.007). Signals live in the Kubernetes API server audit log and its managed equivalents (EKS control-plane logs, GKE Cloud Audit Logs, AKSAudit tables) plus Falco runtime events. Gives the defender view of each path, the audit fields to alert on, a hunt, and RBAC, admission-control, and audit-logging hardening mapped to the UMBRASEC guide. Use when hardening a Kubernetes cluster, reviewing RBAC roles and bindings, designing PodSecurity or Kyverno/Gatekeeper admission policy, tuning API server audit logging, hunting a privileged-pod foothold, or triaging an unexpected clusterrolebinding change or pods/exec event.
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 Harden K8s skill?
Use Harden K8s when your Claude Code task falls under the Security category — specifically in the identity access 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 Harden K8s" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Harden K8s 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. Harden K8s 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/.

Attribution & license

Cite this skill

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

APA
umbrasec-labs. (2026). Harden K8s [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/harden-k8s/
BibTeX
@misc{harden-k8s-2026,
  author    = {umbrasec-labs},
  title     = {Harden K8s [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/harden-k8s/}
}

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Security scan

Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (data-exfil), including a high-severity pattern. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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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
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