What is nixos AGENTS.md?

Repository instructions for Bad3r/nixos, a project that configures the Nix operating system and its software environment. They include an overview and safety rules for working in the repository.

Use them when making or reviewing changes in the Bad3r/nixos repository, especially Nix configuration and agent instructions.

They help an agent understand the project before editing files and avoid changes that cannot be safely undone.

How Bad3r/nixos configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to Bad3r/nixos. 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/Bad3r/nixos/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Bad3r/nixos

Made for: Codex, OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/bad3r/nixos/agents-md/github.svg)](https://agentmods.dev/instructions/bad3r/nixos/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/bad3r/nixos/agents-md"><img src="https://agentmods.dev/badge/instructions/bad3r/nixos/agents-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/bad3r/nixos/agents-md"><img src="https://agentmods.dev/badge/instructions/bad3r/nixos/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,286 This file is loaded in full into every session.

When invoked 1,286 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 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.

Model	Per session	Once invoked
Fable 5.1	$0.01286	$0.01286
Opus 5.5	$0.00514	$0.00514
Sonnet 5.5	$0.00257	$0.00257
Haiku 4.5	$0.00129	$0.00129

Measured today against content hash cca0208f0914, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nixos AGENTS.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 today.

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.

AGENTS.md · 91 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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.

today Changed · -7 lines · -138 tokens per session cca0208f0914
9d ago Changed · +5 lines · +85 tokens per session c9baa72c3d36
21d ago Changed · -2 lines · -47 tokens per session 44eade9581ba
22d ago Changed · +6 lines · +97 tokens per session fcbe86f35aae
24d ago Changed · -278 lines · -3,418 tokens per session scan D → A 1b5cc2807ca8
1mo ago Changed · +1 lines · +16 tokens per session 5918dae0c708
1mo ago Changed · +6 lines · +75 tokens per session 858331c7fd0d
1mo ago Changed · +1 lines · +23 tokens per session 16714551f505
2mo ago Changed · +2 lines · +30 tokens per session 7f163f0598b1
2mo ago First seen · 357 lines · 4,563 tokens per session scan D baa31967141e

Subscribe to this mod's changes

nixos AGENTS.md is an instructions file published in the GitHub repository Bad3r/nixos (9 stars, last pushed today), licensed AGPL-3.0. It adds 1,286 tokens to every session, about $0.0051 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 2026-08-31.

iac infrastructure-as-code nixos-config nixos-configuration

nixos AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
nixos AGENTS.mdBad3r/nixos	Instructions file	9	today	AGPL-3.0	A	1,286	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
vscode ai-customization.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	1,907	GitHub Copilot

nixos: Instructions file for Codex