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kube-agents: Skill for Claude Code

.agents/skills/review-security-k8s-admission/SKILL.md

review-security-k8s-admission is a skill for Claude Code, Codex from gke-labs/kube-agents. It costs 24 tokens per session (450 once invoked), scanned A, original, Apache-2.0.

A security review checklist for Kubernetes admission control, the system that checks or changes objects before Kubernetes accepts them. It examines webhooks and policy rules for bypasses, outages, unsafe scope, and insecure traffic.

In plain words
What is it for?
Use it to review validating or mutating webhooks and policies, including failure behavior, exemptions, TLS, network access, injected settings, and reinvocation.
Why use it?
It helps find configurations that could let unsafe workloads through, expose cluster information, or make the Kubernetes API unavailable.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is gke-labs/kube-agents's own configuration. It tells Claude Code and Codex how to work on kube-agents itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything kube-agents configures →

not rated 54repo +2 today A scan SkillSpector: pass 24 tokens original Apache-2.0
View source ↗ gke-labs/kube-agents gke-labs.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to gke-labs/kube-agents. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/gke-labs/kube-agents/main/.agents/skills/review-security-k8s-admission/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/gke-labs/kube-agents

Made for: Claude Code, Codex.

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.

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README.md
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Your own site
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for review-security-k8s-admission

Your own site · 80×15
<a href="https://agentmods.dev/skills/gke-labs/kube-agents/review-security-k8s-admission"><img src="https://agentmods.dev/badge/skills/gke-labs/kube-agents/review-security-k8s-admission.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 450 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original 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 5.1 $0.00024 $0.00450
Opus 5 $0.00012 $0.00225
Sonnet 5 $0.00005 $0.00090
Haiku 4.5 $0.00002 $0.00045

Measured 13d ago against content hash 8838df20a307, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

review-security-k8s-admission 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 13d 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.

.agents/skills/review-security-k8s-admission/SKILL.md · 28 lines

What it actually says

Task

Review Kubernetes Admission Control (ValidatingWebhookConfiguration, MutatingWebhookConfiguration, ValidatingAdmissionPolicy, MutatingAdmissionPolicy).

Checks

1. Webhook Failure Modes & DoS

  • Fail Closed: Flag failurePolicy: Ignore on security webhooks as a bypass risk (DoS allows bypass). Prefer Fail.
  • Timeouts: Flag high timeoutSeconds (e.g. 30s) as API connection exhaustion risks.

2. Scope Evasion

  • Exemptions: Scrutinize namespaceSelector/objectSelector. Flag blanket kube-system exemptions; recommend specific label targeting.
  • Binding Scope: Ensure VAP/MAP bindings don't inadvertently exclude critical users/namespaces.
  • CEL Failures: Flag VAP failurePolicy: Ignore for runtime errors. Prefer Fail.
  • Message Leakage: Ensure VAP messageExpression hides sensitive cluster metadata.

3. Traffic Security

  • TLS: Require caBundle and HTTPS.
  • Ingress: Require NetworkPolicy restricting webhook ingress solely to the API server.

4. Mutating Risks

  • Injection Abuse: Flag if label/annotation manipulation allows unprivileged pods to inject privileged sidecars/env vars.
  • Reinvocation: Review the inent of the webhook and identify if reinvocationPolicy: IfNeeded should be required. This ensures, if later webhooks make mutations that earlier webhooks have an opinion on, that the earlier webhooks are run again to ensure the same policies are applied to those later mutations. In general, if certain mutations are always expected, a validating webhook should also be used to confirm the mutation was successful. Validation always runs after mutation.
  • CEL Side Effects: Ensure MAP safely merges data without stripping security contexts.
  • Execution Order: Flag if legacy mutating webhooks can overwrite secure baselines injected by earlier MAPs.
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. 13d ago First seen · 28 lines · 24 tokens per session scan A 8838df20a307

Subscribe to this mod's changes

review-security-k8s-admission is a skill published in the GitHub repository gke-labs/kube-agents (54 stars, last pushed today), licensed Apache-2.0. It adds 24 tokens to every session and 450 once invoked, about $0.0001 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 2026-08-30.

Security
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