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dotfiles: Skill for Claude Code

.claude/skills/update__nix_darwin/SKILL.md

update__nix_darwin is a skill for Claude Code from shunsock/dotfiles. It costs 98 tokens per session (753 once invoked), scanned B, original, no licence file.

An automated workflow for updating dependencies in nix-darwin, the system-configuration tool for macOS built with Nix. It updates the dependency lock file and prepares the change in Git.

In plain words
What is it for?
Use it to run the update task in a nix-darwin directory, create a dedicated branch, commit the updated flake.lock file, and push the branch.
Why use it?
It groups the steps for a dependency update into one workflow, reducing the chance of missing branch, commit, or push work. A flake lock file records the exact dependency versions used by a Nix configuration.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

This is shunsock/dotfiles's own configuration. It tells Claude Code how to work on dotfiles itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything dotfiles configures →

not rated 10repo 1mo ago B scan 98 tokens no licence
View source ↗ shunsock/dotfiles
Reuse

Borrowing it

Nothing to install: this file belongs to shunsock/dotfiles. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/shunsock/dotfiles/main/.claude/skills/update__nix_darwin/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/shunsock/dotfiles

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 update__nix_darwin

README.md
[![agentmods](https://agentmods.dev/badge/skills/shunsock/dotfiles/update__nix_darwin/github.svg)](https://agentmods.dev/skills/shunsock/dotfiles/update__nix_darwin)
Your own site
<a href="https://agentmods.dev/skills/shunsock/dotfiles/update__nix_darwin"><img src="https://agentmods.dev/badge/skills/shunsock/dotfiles/update__nix_darwin/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.

agentmods 80×15 button for update__nix_darwin

Your own site · 80×15
<a href="https://agentmods.dev/skills/shunsock/dotfiles/update__nix_darwin"><img src="https://agentmods.dev/badge/skills/shunsock/dotfiles/update__nix_darwin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 98 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 753 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00098 $0.00753
Opus 5.5 $0.00039 $0.00301
Sonnet 5.5 $0.00020 $0.00151
Haiku 4.5 $0.00010 $0.00075

Measured 2mo ago against content hash db0b75131c5c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

update__nix_darwin 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 2mo 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.

- このスキルは **`task apply` を実行しない**。apply は sudo を伴い Claude では実行できないため、適用はユーザーに依頼する (PR マージ後に手動で `task apply`)。
.claude/skills/update__nix_darwin/SKILL.md · 60 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2mo ago First seen · 60 lines · 98 tokens per session scan B db0b75131c5c

Subscribe to this mod's changes

update__nix_darwin is a skill published in the GitHub repository shunsock/dotfiles (10 stars, last pushed 1mo ago), with no licence file. It adds 98 tokens to every session and 753 once invoked, about $0.0004 per session on Opus 5.5. 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.

Git and workflowconfigdotfilesneovimnixnix-darwinvim
Related

update__nix_darwin compared with skills from other repositories

update__nix_darwin next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
update__nix_darwinshunsock/dotfilesSkill101mo agononeB98Claude Code
write-tech-noteaiya000/dotfilesSkill214d agoMITA69Claude Code
show-issues-overviewaiya000/dotfilesSkill214d agoMITA69Claude Code
git-commitaiya000/dotfilesSkill214d agoMITA43Claude Code
create-handoffaiya000/dotfilesSkill214d agoMITA134Claude Code
sync-global-kiro-skilsaiya000/dotfilesSkill214d agoMITA76Claude Code, Codex
sync-labels-from-prs-and-sub-issuesaiya000/dotfilesSkill214d agoMITA104Claude Code, Codex