agentmods.dev

nix-config: Instructions file for Codex

AGENTS.md

nix-config AGENTS.md is an instructions file for Codex, OpenCode from dliberalesso/nix-config. It costs 1,379 tokens per session, scanned A, original, MIT.

Project instructions for dliberalesso/nix-config, a configuration repository for Nix and NixOS. They describe the project structure, architecture references, and commands for formatting, checking, rebuilding, updating, and maintaining the system.

In plain words
What is it for?
Use them when working on this repository to find the right build, lint, test, rebuild, dependency-update, debugging, and Nix store commands. They also point to the architecture guides that should be read before changing specific areas.
Why use it?
They give a coding agent the project’s expected workflow and boundaries before it changes files.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md.

This is dliberalesso/nix-config's own configuration. It tells Codex and OpenCode how to work on nix-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 nix-config configures →

not rated 6repo changed yesterday A scan 1,379 tokens original MIT
View source ↗ dliberalesso/nix-config
Reuse

Borrowing it

Nothing to install: this file belongs to dliberalesso/nix-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/dliberalesso/nix-config/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/dliberalesso/nix-config

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.

agentmods badge for nix-config AGENTS.md

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

agentmods 80×15 button for nix-config AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/dliberalesso/nix-config/agents-md"><img src="https://agentmods.dev/badge/instructions/dliberalesso/nix-config/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,379 This file is loaded in full into every session.
When invoked 1,379 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 $0.01379 $0.01379
Opus 5.5 $0.00552 $0.00552
Sonnet 5.5 $0.00276 $0.00276
Haiku 4.5 $0.00138 $0.00138

Measured yesterday against content hash 358fabdbdaab, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nix-config 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 yesterday.

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

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Instructions for nix-config

Build/Lint/Test Commands

  • Format code: just fmt (runs treefmt with nixfmt, prettier, stylua, etc.)
  • Lint/check: just lint (runs nix flake check)
  • Rebuild system: just rebuild (rebuilds and switches NixOS with nh)
  • Update dependencies: just update (updates flake inputs)
  • Diff lock file: just diff (shows changes to flake.lock using jj)
  • Clean store: just clean (garbage collect and optimize with nh)
  • Repair store: just repair (verify and repair Nix store integrity)
  • Debug in REPL: just debug (opens nix repl with debug flag enabled)

Architecture Guidance

  • Start with .rpiv/guidance/architecture.md for the current project map and architectural boundaries
  • Before changing a specific area, read the matching sub-guide under .rpiv/guidance/**/architecture.md
  • Treat .rpiv/guidance/ as the canonical architecture and workflow reference; prefer linking to it over duplicating detailed patterns here

Architecture

  • Framework: unify + flake-parts + import-tree
  • High-level shape: hosts/ contains concrete machines; modules/ contains reusable capabilities, packages, programs, and profiles
  • Current desktop direction: niride is transitional; shared graphical concerns belong in gui; future work may support both niride and hyprde
  • Current secret-management entrypoint: modules/toplevel/secrets.nix

Common Patterns

  • Defining a host: see .rpiv/guidance/hosts/architecture.md
  • Reusable module framework: see .rpiv/guidance/modules/architecture.md
  • Adding/changing program modules: see .rpiv/guidance/modules/programs/architecture.md
  • Reusable system/platform changes: see .rpiv/guidance/modules/system/architecture.md
  • Package/export changes: see .rpiv/guidance/modules/packages/architecture.md
  • Top-level profile or desktop-session changes: see .rpiv/guidance/modules/toplevel/architecture.md
  • Neovim/nixCats changes: see .rpiv/guidance/modules/nvim/architecture.md
  • Flake tooling changes: see .rpiv/guidance/modules/flake/architecture.md
  • Adding flake inputs: for eval-time inputs, follow nix-proxy-flake/nixpkgs where applicable; for build-time only inputs, use buildTime = true; and flake = false;
  • Theme scheme plumbing: theme scheme options are defined in modules/theme/scheme.nix providing Catppuccin color definitions

Read the full file on GitHub · 91 lines

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. yesterday Changed · -7 tokens per session 358fabdbdaab
  2. 4d ago Changed · +3 lines · +138 tokens per session 7690b307a73a
  3. 5d ago Changed · +7 tokens per session d2482a481f9b
  4. 16d ago Changed · +1 tokens per session c16e27321cef
  5. 1mo ago Changed · -9 tokens per session e10a2d83ed7a
  6. 2mo ago First seen · 88 lines · 1,249 tokens per session scan A 19ca83ca9098

Subscribe to this mod's changes

nix-config AGENTS.md is an instructions file published in the GitHub repository dliberalesso/nix-config (6 stars, last pushed yesterday), licensed MIT. It adds 1,379 tokens to every session, about $0.0055 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.

dotfilesflake-partshome-managerneovimnixnixos
Related

nix-config AGENTS.md compared with instructions from other repositories

nix-config AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
nix-config AGENTS.mddliberalesso/nix-configInstructions file6yesterdayMITA1,379Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143kyesterdayMITA7,461Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA5,649GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchainInstructions file149ktodayMITA4,680Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA3,093GitHub Copilot
vscode ai-customization.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA1,907GitHub Copilot