What is system-namespaces?

A set of guidance for cluster-wide Kubernetes add-ons and system namespaces, including time-zone injection, node upgrades, DNS, networking, and scheduling helpers. A Kubernetes namespace is a boundary used to group and control resources.

Use it before changing system controllers, kube-system add-ons, resource settings, webhook behavior, or namespace placement.

It prevents moving critical controllers into an incompatible namespace and avoids breaking admission webhooks, resource guarantees, or node placement. It also documents ordering constraints for changes that cannot be safely applied atomically.

How Aviator-Coding/home-ops configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to Aviator-Coding/home-ops. 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/Aviator-Coding/home-ops/main/.agents/skills/system-namespaces/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/Aviator-Coding/home-ops

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/aviator-coding/home-ops/system-namespaces/github.svg)](https://agentmods.dev/skills/aviator-coding/home-ops/system-namespaces)

Your own site

<a href="https://agentmods.dev/skills/aviator-coding/home-ops/system-namespaces"><img src="https://agentmods.dev/badge/skills/aviator-coding/home-ops/system-namespaces/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/aviator-coding/home-ops/system-namespaces"><img src="https://agentmods.dev/badge/skills/aviator-coding/home-ops/system-namespaces.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 96 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,274 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.

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	$0.00096	$0.01274
Opus 5.5	$0.00038	$0.00510
Sonnet 5.5	$0.00019	$0.00255
Haiku 4.5	$0.00010	$0.00127

Measured 22d ago against content hash 3f90a4c6e4d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

system-namespaces 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 22d 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/system-namespaces/SKILL.md · 47 lines

How it starts

The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.

System namespaces: k8tz, tuppr and kube-system add-ons

Tripwires

Do not merge system-controller or system-upgrade into system. k8tz's chart prepends its release namespace to ignoredNamespaces with no opt-out, so the move strips TZ injection from system. The webhook object is cluster-scoped and same-named, so the uninstall/install has no safe order. tuppr's namespace is on the Talos API allowlist. k8tz.md
k8tz stays requests == limits on every container it runs, including the injected init container and the cert-watcher sidecar. failurePolicy: Fail is on the critical path of pod CREATE. The two replicas stay on distinct nodes (PDB plus DoNotSchedule spread). Raising only the CPU limit demotes the pod to Burstable. k8tz.md
imageVolume stays off. Chart 0.20.0 already contains the strategy. Upstream still recommends the init container because imageVolume does not mount /etc/localtime. Reopen only when upstream supports that mount and changes the recommendation. Dropping the init container also drops its requests, which is a separate accept.
Admission webhooks mutate CREATE only. A CronJob born before the webhook keeps a wrong spec.timeZone while looking healthy. Fix is delete and recreate, never a hand-patched spec.timeZone. HelmRelease-owned objects need flux reconcile hr <name> --force. Read the object again after a second reconcile. webhook-drift.md
CoreDNS answers AAAA with NODATA, and autopath stays out while cache serve_stale is set. serve_stale turns autopath answers into NXDOMAIN after about 30s, and a DHCP search domain on the node resolver then breaks external names. pods verified existed only to feed autopath. The other half is domains: [] in the machine config (skill talos-nodes). Forward upstream is Talos hostDNS 169.254.116.108 via dnsPolicy: None.
fstrim must not filter out kubelet mounts. Every Ceph PV is mounted under /var/lib/kubelet. A grep -v kubelet recipe trims nothing that matters. The job's awk ranks kubelet-namespace mounts and skips read-only ones. FstrimJobFailed (fstrim/app/prometheusrule.yaml) fires on the CronJob's latest run failing or no success in 8 days; it reads kube-state-metrics CronJob timestamps, so it clears itself on the next good run.
MGLRU is disabled twice, and both stay. machine.sysfs sets kernel/mm/lru_gen/enabled to 0, and kube-system/mglru-disable rewrites the same sysfs every 300s. Do not delete either until a reboot has proved the other still holds. Skill talos-nodes.
Multus tolerations cannot be set through chart values. The chart hardcodes them. The dedicated-taint toleration is a JSON6902 postRenderer. Skill node-scheduling.
Descheduler does not clear PreferNoSchedule drift. Policy and thresholds: skill node-scheduling.

Read the full file on GitHub · 47 lines

Files

What ships with it

2 files 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.

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.

22d ago Changed 3f90a4c6e4d4
25d ago First seen · 47 lines · 96 tokens per session scan A 5dd7caca72d6

Subscribe to this mod's changes

system-namespaces is a skill published in the GitHub repository Aviator-Coding/home-ops (3 stars, last pushed today), licensed MIT. It adds 96 tokens to every session and 1,274 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-09-29.

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home-ops: Skill for Claude Code