nixos-linux-master

nixos-linux-master is a skill for Claude Code, Codex from VoidNxSEC/securellm-mcp. It costs 113 tokens per session (2,428 once invoked), scanned A, original, Apache-2.0.

A guidance package for NixOS, a Linux distribution configured with code, and its Nix flakes, which describe reproducible system setups. It covers system administration, package building, debugging, compiler tuning, and security hardening.

In plain words
What is it for?
Use it to develop flakes, write NixOS configurations, build packages, debug systems, improve compiler settings, and plan security hardening.
Why use it?
It helps organize complex NixOS configurations and investigate Linux problems without relying on ad-hoc changes. It also helps keep system setups reusable and reproducible.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Install

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.

agentmods
npx agentmods add skills/voidnxsec/securellm-mcp/nixos-linux-master
Any agent
npx skills add VoidNxSEC/securellm-mcp --skill nixos-linux-master
Clone the repo
git clone --depth 1 https://github.com/VoidNxSEC/securellm-mcp

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.

agentmods badge for nixos-linux-master

README.md
[![agentmods](https://agentmods.dev/badge/skills/voidnxsec/securellm-mcp/nixos-linux-master.svg)](https://agentmods.dev/skills/voidnxsec/securellm-mcp/nixos-linux-master)
Your own site
<a href="https://agentmods.dev/skills/voidnxsec/securellm-mcp/nixos-linux-master"><img src="https://agentmods.dev/badge/skills/voidnxsec/securellm-mcp/nixos-linux-master.svg" alt="Measured on agentmods" height="20"></a>
Per session 113 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,428 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00113 $0.02428
Opus 5 $0.00056 $0.01214
Sonnet 5 $0.00023 $0.00486
Haiku 4.5 $0.00011 $0.00243

Measured 5d ago against content hash dfcbff6cb708, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

nixos-linux-master 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 5d ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/flake-scaffold.sh, scripts/nix-build-debug.sh, scripts/system-analyzer.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/nix-expert/nixos-linux-master/SKILL.md · 291 lines

How it starts

The opening of the file, as written. The whole thing — 291 lines — stays where its author put it; the contents beside it link to each section on GitHub.

NixOS Linux Master

Advanced expertise in NixOS, Nix flakes, Linux systems, and innovative problem-solving. This skill provides cutting-edge solutions, proactive suggestions, and deep technical knowledge.

Core Philosophy

Think outside the box. Don't accept conventional limitations—explore alternative approaches, leverage advanced features, and create elegant solutions. Every problem has multiple solutions; find the most efficient and innovative one.

Be proactive. Don't just respond—anticipate needs, suggest improvements, identify potential issues before they arise, and propose architectural enhancements.

Leverage the ecosystem. NixOS and Linux offer powerful primitives. Use overlays, derivations, modules, and system features creatively to solve problems that seem impossible with traditional approaches.

Flake Development Excellence

Advanced Patterns

Always structure flakes for:

  • Modularity: Separate concerns into overlays, modules, packages, and lib functions
  • Reusability: Create composable abstractions that work across projects
  • Type safety: Use module system type checking extensively
  • Progressive disclosure: Keep flake.nix lean, move complexity to imported files
  • Multi-system support: Use flake-utils or manual eachSystem for cross-platform compatibility

Innovative Approaches

Auto-detection: Build systems that intelligently detect project requirements:

# Detect language and configure automatically
projectType = 
  if builtins.pathExists ./Cargo.toml then "rust"
  else if builtins.pathExists ./go.mod then "go"
  else "generic";

Zero-config packages: Create derivations that auto-discover dependencies via pkg-config scanning, AST analysis, or manifest parsing.

Incremental builds: Use ccache, sccache, or custom caching strategies to speed up rebuilds dramatically.

Cross-compilation ready: Always consider cross-compilation from the start—use crossSystem, proper platform checks, and avoid hardcoded assumptions.

Read the full file on GitHub · 291 lines

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. 5d ago First seen · 291 lines · 113 tokens per session scan A dfcbff6cb708

Subscribe to this mod's changes

nixos-linux-master is a skill published in the GitHub repository VoidNxSEC/securellm-mcp (0 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 113 tokens to every session and 2,428 once invoked, about $0.0006 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 2026-08-31.

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