module

module is a skill for Claude Code from MCB-SMART-BOY/nixos-config. It costs 32 tokens per session (744 once invoked), scanned A, original, Apache-2.0.

A procedure for creating or editing NixOS and Home Manager modules. Modules are reusable configuration files that turn system or user features on and define how they work.

In plain words
What is it for?
Use it to add system services or features, create user configuration modules, register imports, define switches, manage packages and settings, and run formatting and validation checks.
Why use it?
It provides the project’s conventions for placing modules, declaring options, sharing helpers, and validating changes.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

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/mcb-smart-boy/nixos-config/module
Any agent
npx skills add MCB-SMART-BOY/nixos-config --skill module
Clone the repo
git clone --depth 1 https://github.com/MCB-SMART-BOY/nixos-config

Made for: Claude Code.

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 module

README.md
[![agentmods](https://agentmods.dev/badge/skills/mcb-smart-boy/nixos-config/module.svg)](https://agentmods.dev/skills/mcb-smart-boy/nixos-config/module)
Your own site
<a href="https://agentmods.dev/skills/mcb-smart-boy/nixos-config/module"><img src="https://agentmods.dev/badge/skills/mcb-smart-boy/nixos-config/module.svg" alt="Measured on agentmods" height="20"></a>
Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 744 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 $0.00032 $0.00744
Opus 5 $0.00016 $0.00372
Sonnet 5 $0.00006 $0.00149
Haiku 4.5 $0.00003 $0.00074

Measured today against content hash fa44d21ae565, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

module 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 today.

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.

.claude/skills/module/SKILL.md · 69 lines

What it actually says

Module

系统模块模板

# modules/<name>.nix — <职责>
{ config, lib, pkgs, ... }:
let cfg = config.mcb.<选项>;
in {
  config = lib.mkIf cfg.enable {
    # 实现
  };
}

规则:lib.mkIf 条件启用、不用 with lib;;需要机器覆盖的共享默认值用 lib.mkDefault,合并型列表/条件接线按语义选择优先级;普通模块不声明 options.mcb.*(impermanence/secrets 平台骨架例外,需注明原因)。

共享辅助函数

NixOS 系统模块从 modules/lib.nix 导入,不要本地重定义:

inherit (import ./lib.nix { inherit lib; })
  resolvePkg
  validUserName
  managedUserNames;

resolvePkg — 安全解析 nixpkgs 路径(替代手动 tryEval) validUserName — POSIX 用户名格式校验 managedUserNames — 从 mcb.users 解析用户,空列表回退 mcb.user

Home Manager 用户模块属于 /home/admin/mcbctl,其 homeModules.default 是 portable core;homeModules.linuxhomeModules.nirihomeModules.nixos 分别提供 Linux、Niri 与 NixOS integration 能力。用户入口校验、能力 provider 与输出聚合由 mcbctl 的 flake/default.nix 维护,不从 NixOS 仓库导入。

创建步骤

  1. 如需新开关 → modules/options.nixoptions.mcb 下声明
  2. 创建 modules/<name>.nix
  3. modules/default.nix imports 中注册(按分组顺序:核心→系统基础→包服务→桌面扩展→平台级)
  4. nix fmt && statix check && deadnix --fail . && nix flake check

Home Manager 用户模块模板

# /home/admin/mcbctl/home/<feature>.nix
{ config, lib, pkgs, ... }:
{
  config = {
    home.packages = with pkgs; [ ... ];
    programs.xxx.enable = true;
    xdg.configFile."..." = { ... };
  };
}

/home/admin/mcbctl/home/default.nix 的 imports 中加入 ./<feature>.nix,再按模块是否依赖宿主能力选择 homeModules.linuxhomeModules.nirihomeModules.nixos,然后在 mcbctl 目录运行 nix flake check

命名约定

类型 文件 示例
系统功能 modules/<name>.nix gaming.nix
系统服务 modules/services/<name>.nix services/desktop.nix
用户功能 /home/admin/mcbctl/home/<name>.nix desktop.nix
选项声明 modules/options.nix(唯一)
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. today Changed · +6 lines fa44d21ae565
  2. 5d ago First seen · 63 lines · 32 tokens per session scan A 386b4f659713

Subscribe to this mod's changes

module is a skill published in the GitHub repository MCB-SMART-BOY/nixos-config (10 stars, last pushed today), licensed Apache-2.0. It adds 32 tokens to every session and 744 once invoked, about $0.0002 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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