Borrowing it
Nothing to install: this file belongs to MCB-SMART-BOY/nixos-config. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/MCB-SMART-BOY/nixos-config/solo/.claude/skills/update/SKILL.mdgit clone --depth 1 https://github.com/MCB-SMART-BOY/nixos-configWrote 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/mcb-smart-boy/nixos-config/update)<a href="https://agentmods.dev/skills/mcb-smart-boy/nixos-config/update"><img src="https://agentmods.dev/badge/skills/mcb-smart-boy/nixos-config/update.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 | $0.00040 | $0.00576 |
| Opus 5 | $0.00020 | $0.00288 |
| Sonnet 5 | $0.00008 | $0.00115 |
| Haiku 4.5 | $0.00004 | $0.00058 |
Grade B, and why
update scanned grade B with 1 finding 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 3d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo nixos-rebuild switch --flake /etc/nixos#<machine> What it actually says
Update
流程
# 1. 准备：按项目查看输入
cd /home/admin/nixos-config
git status
nix flake metadata --json | jq '.locks.nodes.nixpkgs.locked'
cd /home/admin/mcbctl
git status
nix flake metadata --json | jq '{nixpkgs: .locks.nodes.nixpkgs.locked, home-manager: .locks.nodes."home-manager".locked, nixvim: .locks.nodes.nixvim.locked}'
# 2. 更新对应项目
nix flake update --flake /etc/nixos
# 或单 input: nix flake lock --update-input nixpkgs --flake /etc/nixos
nix flake update --flake /home/admin/mcbctl
# 3. 检查 diff
git -C /home/admin/nixos-config diff flake.lock
git -C /home/admin/mcbctl diff flake.lock
# 4. Eval 验证
cd /home/admin/nixos-config
nix flake check
cd /home/admin/mcbctl
nix flake check
# 5. 构建验证
cd /home/admin/nixos-config
nixos-rebuild build --flake /etc/nixos#<machine>
# 6. 应用
sudo nixos-rebuild switch --flake /etc/nixos#<machine>
# 7. 提交
git add flake.lock
git commit -m "chore: update flake lock"
兼容性问题处理
| 症状 | 处理 |
|---|---|
attribute 'xxx' missing |
搜索 nixpkgs 替代品；更新引用 |
option 'xxx' renamed to 'yyy' |
按警告更新选项名 |
| 覆盖层失效 | 检查上游是否修复 → 移除/调整覆盖 |
| 弹性包解析断裂 | 用 modules/lib.nix 的 resolvePkg 替代手动 tryEval |
回滚
git checkout HEAD~1 -- flake.lock
sudo nixos-rebuild switch --flake /etc/nixos#<machine>
安全策略
更新时机：定期维护、需要新版本包功能、安全修复 不更新时机：系统刚稳定、正在做其他重构、nixpkgs-unstable 大面积 breaking change
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.
- 3d ago Changed · +11 lines · +1 tokens per session 26b53f43bc92
- 8d ago First seen · 56 lines · 39 tokens per session scan B 59bc458216b0
update is a skill published in the GitHub repository MCB-SMART-BOY/nixos-config (10 stars, last pushed 3d ago), licensed Apache-2.0. It adds 40 tokens to every session and 576 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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