Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add michalzubkowicz/nixos-management-skill --skill nixos-managinggit clone --depth 1 https://github.com/michalzubkowicz/nixos-management-skillWrote 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.
[](https://agentmods.dev/skills/michalzubkowicz/nixos-management-skill/nixos-managing)<a href="https://agentmods.dev/skills/michalzubkowicz/nixos-management-skill/nixos-managing"><img src="https://agentmods.dev/badge/skills/michalzubkowicz/nixos-management-skill/nixos-managing/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.
<a href="https://agentmods.dev/skills/michalzubkowicz/nixos-management-skill/nixos-managing"><img src="https://agentmods.dev/badge/skills/michalzubkowicz/nixos-management-skill/nixos-managing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
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 →
- medium MCP Rug Pull · line 123 uvx/uv tool run commands without ==version create a rug-pull risk.Fix: Pin the version: uvx package-name==1.2.3
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 | $0.00050 | $0.02444 |
| Opus 5 | $0.00025 | $0.01222 |
| Sonnet 5 | $0.00010 | $0.00489 |
| Haiku 4.5 | $0.00005 | $0.00244 |
Grade A, and why
nixos-managing 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.
How it starts
The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NixOS Management
Quick Decision: What do you need?
| Task | Go to |
|---|---|
| Rebuild / activate / rollback system | vm-management.md |
| Install NixOS on new machine | installation.md |
| Build ISO / disk image / VM image | image-building.md |
| Configure modules, flakes, packages, services | configuration.md |
| Ephemeral root / wipe on boot / impermanence | impermanence.md |
| LUKS encryption / remote unlock (SSH, Tailscale) | luks.md |
| Health checks / Telegram (or webhook) alerts for filesystem, disk, SMART, services | monitoring.md |
| Something isn't working / weird behavior | anti-patterns.md |
Execution Context — Ask First
Before suggesting any commands, establish where they will run.
NixOS management involves multiple machines. Commands that work on the NixOS host will fail on macOS or non-NixOS Linux. Always determine the setup before suggesting commands.
If unsure — ask: "Where are you editing configs, and where does nixos-rebuild run?"
All common setups
Setup A — NixOS local (everything on one machine)
NixOS machine: edit → nixos-rebuild switch (local)
- All commands run locally
nixos-option,man configuration.nix,nixos-rebuild— all local
Setup B — NixOS workstation → NixOS remote server
NixOS workstation (edit) → nixos-rebuild --target-host → NixOS server
nixos-rebuildruns on workstation, deploys to server- Option verification: workstation (has nixpkgs) or server via SSH
nixos-optionon server reflects what's actually active there
Setup C — macOS → NixOS remote (Linux rebuilds locally)
macOS (edit .nix files) → push/rsync → NixOS Linux host → nixos-rebuild switch (local)
nixos-rebuildruns on the Linux host (SSH in, or via remote trigger)- Option verification: SSH into Linux host — macOS has no
nixos-option search.nixos.org/optionsalways works from macOS
What ships with it
8 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.
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 · 222 lines · 50 tokens per session scan A a91d6640e398
nixos-managing is a skill published in the GitHub repository michalzubkowicz/nixos-management-skill (60 stars, last pushed 1mo ago), licensed MIT. It adds 50 tokens to every session and 2,444 once invoked, about $0.0003 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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