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 agentmods add skills/voidnxsec/securellm-mcp/nixos-linux-masternpx skills add VoidNxSEC/securellm-mcp --skill nixos-linux-mastergit clone --depth 1 https://github.com/VoidNxSEC/securellm-mcpWrote 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/voidnxsec/securellm-mcp/nixos-linux-master)<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>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 | $0.00113 | $0.02428 |
| Opus 5 | $0.00056 | $0.01214 |
| Sonnet 5 | $0.00023 | $0.00486 |
| Haiku 4.5 | $0.00011 | $0.00243 |
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.
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 — 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.
What ships with it
10 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.
- assets/flake-templates/smart-template.nix 3.7 KB
- README.md 6.8 KB
- references/git-workflow.md 9.6 KB
- references/linux-debug-cookbook.md 6.8 KB
- references/nix-flakes-patterns.md 6.6 KB
- references/packaging-guide.md 10 KB
- references/security-hardening.md 13 KB
- scripts/flake-scaffold.sh 8.6 KB runs code
- scripts/nix-build-debug.sh 7.0 KB runs code
- scripts/system-analyzer.sh 9.7 KB runs code
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.
- 5d ago First seen · 291 lines · 113 tokens per session scan A dfcbff6cb708
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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