dotfiles nix.instructions.md

Project instructions for managing a workstation configuration with Nix and nix-darwin. They describe common setup tasks and how to add programs or configuration files.

In plain words
What is it for?
Use them when adding a graphical application, creating a configuration module, or following the project's setup process.
Why use it?
They give coding agents consistent project-specific steps for changing the workstation setup.

Instructions file for GitHub Copilot

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 instructions/pjvds/dotfiles/nix
Clone the repo
git clone --depth 1 https://github.com/pjvds/dotfiles

Made for: GitHub Copilot.

Per session 4,266 This file is loaded in full into every session.
When invoked 4,266 The same file — it is already loaded in full.
Security scan B 1 finding. Scan, not verified.
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 $0.04266 $0.04266
Opus 5 $0.02133 $0.02133
Sonnet 5 $0.00853 $0.00853
Haiku 4.5 $0.00427 $0.00427

Measured 2d ago against content hash 740d894c46c6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

dotfiles nix.instructions.md 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 2d 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 nix run nix-darwin/master#darwin-rebuild -- switch --rollback
.github/instructions/nix.instructions.md · 539 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. 2d ago First seen · 539 lines · 4,266 tokens per session scan B 740d894c46c6

Subscribe to this mod's changes

dotfiles nix.instructions.md is an instructions file published in the GitHub repository pjvds/dotfiles (23 stars, last pushed 2d ago), with no licence file. It adds 4,266 tokens to every session, about $0.0213 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 2026-08-30.