dotfiles: Instructions file for GitHub Copilot

.github/instructions/nix.instructions.md

dotfiles nix.instructions.md is an instructions file for GitHub Copilot from pjvds/dotfiles. It costs 4,362 tokens per session, scanned B, original, no licence file.

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

Written for GitHub Copilot: a Copilot instructions file.

This is pjvds/dotfiles's own configuration. It tells GitHub Copilot 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 →

Reuse

Borrowing it

Nothing to install: this file belongs to pjvds/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/pjvds/dotfiles/master/.github/instructions/nix.instructions.md
Clone the repo
git clone --depth 1 https://github.com/pjvds/dotfiles

Made for: GitHub Copilot.

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 dotfiles nix.instructions.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/pjvds/dotfiles/nix"><img src="https://agentmods.dev/badge/instructions/pjvds/dotfiles/nix.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 4,362 This file is loaded in full into every session.
When invoked 4,362 The same file — it is already loaded in full.
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 $0.04362 $0.04362
Opus 5.5 $0.01745 $0.01745
Sonnet 5.5 $0.00872 $0.00872
Haiku 4.5 $0.00436 $0.00436

Measured 1mo ago against content hash 12b6f564aea2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo 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 · 545 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. 1mo ago Changed · +6 lines · +96 tokens per session 12b6f564aea2
  2. 2mo 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 yesterday), with no licence file. It adds 4,362 tokens to every session, about $0.0174 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 2026-08-30.

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