What is review-security-k8s-rbac?

A security review for Kubernetes RBAC, the system that controls which users and services may perform actions in a cluster. It checks permissions and paths that could enable privilege escalation.

Use it to review role bindings, service-account permissions, cluster-admin access, certificate requests, authentication checks, webhooks, and custom-resource permissions.

It helps identify anonymous or overly broad access, dangerous administrator bindings, and permissions that could alter access rules, certificates, webhooks, or custom resources.

How gke-labs/kube-agents configures Claude Code and Codex

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-rbac/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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/gke-labs/kube-agents/review-security-k8s-rbac/github.svg)](https://agentmods.dev/skills/gke-labs/kube-agents/review-security-k8s-rbac)

Your own site

<a href="https://agentmods.dev/skills/gke-labs/kube-agents/review-security-k8s-rbac"><img src="https://agentmods.dev/badge/skills/gke-labs/kube-agents/review-security-k8s-rbac/github.svg" alt="Measured on agentmods" height="20"></a>

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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/gke-labs/kube-agents/review-security-k8s-rbac"><img src="https://agentmods.dev/badge/skills/gke-labs/kube-agents/review-security-k8s-rbac.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 633 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 warn 7 Sept 2026

SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Rogue Agent · line 26
Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.

Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00020	$0.00633
Opus 5	$0.00010	$0.00316
Sonnet 5	$0.00004	$0.00127
Haiku 4.5	$0.00002	$0.00063

Measured 12d ago against content hash b9b23331771a, 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-rbac 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 12d 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-rbac/SKILL.md · 35 lines

How it starts

The opening of the file, as written. The whole thing — 35 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Task

Review Kubernetes RBAC configurations for vulnerabilities, prioritizing GKE best practices and advanced attack vectors.

Checks

1. Global & Default Configs

Default Groups/Users: Flag non-default bindings for system:anonymous, system:unauthenticated, system:authenticated, system:masters.
Broad Service Accounts: Flag bindings for system:serviceaccounts or system:serviceaccounts:<namespace>.
Cluster Admin: Flag cluster-admin bindings to unauthenticated/broad groups.
System Roles: Flag delete/update on system: prefixed bindings.
Missing Namespaces: Flag ClusterRoleBindings to ServiceAccount missing a namespace.

2. Privilege Escalation & Bypasses

RBAC & CSR: Flag bind, escalate, create, update, patch on rbac.authorization.k8s.io. Flag create on certificatesigningrequests or update on certificatesigningrequests/approval.
Webhooks & CRDs: Flag create, update, patch on mutatingwebhookconfigurations, validatingwebhookconfigurations, or customresourcedefinitions.
Auth Probing: Flag create on tokenreviews/subjectaccessreviews.
Policy Bypass: Flag update/patch on namespaces (PSA bypass) or modification access to networkpolicies.

3. Role & Binding Design

Wildcards: Flag * in apiGroups, resources, verbs. Flag deletecollection (DoS risk).
Escalation Verbs: Flag escalate, bind, impersonate.
Over-scoped: Flag ClusterRoleBindings used where namespace-local RoleBindings suffice. Flag disjoint resource/verb sets in single roles.
Self-Modification: Flag roles allowing pods to self-modify (e.g., updating own ServiceAccount/rolebindings).

4. Sensitive Resources

Highly Sensitive: Flag access to secrets, pods/exec, pods/portforward, pods/attach, nodes/proxy (unless strictly scoped via resourceNames).
Secret Harvesting: Flag list or watch on secrets.
Ephemeral/Status: Flag update/patch on pods/ephemeralcontainers or /status subresources.

Read the full file on GitHub · 35 lines

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.

resources/gke-rbac.md 27 KB

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.

12d ago First seen · 35 lines · 20 tokens per session scan A b9b23331771a

Subscribe to this mod's changes

review-security-k8s-rbac is a skill published in the GitHub repository gke-labs/kube-agents (54 stars, last pushed today), licensed Apache-2.0. It adds 20 tokens to every session and 633 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.

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