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nixos-config: Instructions file for GitHub Copilot

.github/copilot-instructions.md

nixos-config copilot-instructions.md is an instructions file for GitHub Copilot from izaac/nixos-config. It costs 210 tokens per session, scanned A, original, MIT.

A Copilot instruction file for a NixOS configuration project. It describes a multi-host Linux setup focused on gaming, security hardening, and the COSMIC desktop, using Nix, Bash, Rust, and Catppuccin.

In plain words
What is it for?
It guides edits to Nix modules and host settings, recommends reusable configuration patterns, and helps validate system builds.
Why use it?
It gives Copilot project context, coding conventions, file locations, and a command for checking NixOS changes.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file. Also seen: mentions AGENTS.md.

This is izaac/nixos-config's own configuration. It tells GitHub Copilot how to work on nixos-config 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 nixos-config configures →

not rated 14repo yesterday A scan 210 tokens original MIT
View source ↗ izaac/nixos-config
Reuse

Borrowing it

Nothing to install: this file belongs to izaac/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.

Copy the file
curl -O https://raw.githubusercontent.com/izaac/nixos-config/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/izaac/nixos-config

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.

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README.md
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Your own site
<a href="https://agentmods.dev/instructions/izaac/nixos-config/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/izaac/nixos-config/copilot-instructions/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 nixos-config copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/izaac/nixos-config/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/izaac/nixos-config/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 210 This file is loaded in full into every session.
When invoked 210 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00210 $0.00210
Opus 5.5 $0.00084 $0.00084
Sonnet 5.5 $0.00042 $0.00042
Haiku 4.5 $0.00021 $0.00021

Measured 2mo ago against content hash f16a9a29c2ef, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nixos-config copilot-instructions.md 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 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.

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.

.github/copilot-instructions.md · 25 lines

What it actually says

Copilot Instructions

Copilot-specific config. Core rules live in AGENTS.md.

Read AGENTS.md for Monko identity, Caveman protocol, and agent boundaries.

Project Overview

  • NixOS configuration flake for multi-host (desktop/laptop).
  • Focus: Gaming performance (NVIDIA), security hardening (sops-nix), and COSMIC DE.
  • Stack: Nix, Bash, Rust (Brush shell), Catppuccin.

Copilot Specifics

  • Chat Style: Keep responses extremely brief (Caveman protocol).
  • Suggestions: Prefer mkIf, lib.optionals, and lib.mkAfter in Nix modules.
  • Paths: Reusable options in modules/; host overrides in hosts/.
  • Validation: Always suggest nh os build . to verify Nix changes.
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 · 25 lines · 210 tokens per session scan A f16a9a29c2ef

Subscribe to this mod's changes

nixos-config copilot-instructions.md is an instructions file published in the GitHub repository izaac/nixos-config (14 stars, last pushed yesterday), licensed MIT. It adds 210 tokens to every session, about $0.0008 per session on Opus 5.5. 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 2026-09-02.

DevOps and cloudSecurity
Related

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vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode