dotfiles: Instructions file for Codex

AGENTS.md

dotfiles AGENTS.md is an instructions file for Codex, OpenCode from ahonn/dotfiles. It costs 376 tokens per session, scanned B, original, MIT.

A project-specific instruction guide for a Nix-based macOS configuration repository, often called dotfiles.

In plain words
What is it for?
Use it when changing workstation or home-server configuration, updating Nix dependencies, managing Homebrew packages, or checking the configuration.
Why use it?
It explains how the repository organizes computer settings and which commands validate or apply changes.

Instructions file for CodexOpenCode

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

This is ahonn/dotfiles's own configuration. It tells Codex and OpenCode 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 ahonn/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/ahonn/dotfiles/master/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/ahonn/dotfiles

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 dotfiles AGENTS.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/ahonn/dotfiles/agents-md"><img src="https://agentmods.dev/badge/instructions/ahonn/dotfiles/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 376 This file is loaded in full into every session.
When invoked 376 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 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 $0.00376 $0.00376
Opus 5.5 $0.00150 $0.00150
Sonnet 5.5 $0.00075 $0.00075
Haiku 4.5 $0.00038 $0.00038

Measured 1mo ago against content hash ebb47c5333da, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

dotfiles AGENTS.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.

- `darwin-rebuild switch`: requires sudo and changes the live system.
AGENTS.md · 29 lines

What it actually says

AGENTS.md

This file provides guidance to coding agents when working with code in this repository.

nix-darwin dotfiles repository managing macOS development environments via Nix flakes. Two hosts, workstation (primary dev machine) and homelab (Mac Mini), share base modules and add host-specific overrides.

Where to Look

  • Nix modules, hosts, packages, Homebrew, or darwin-rebuild failures: use the nix-darwin skill.
  • .claude/, config/, and symlink/ are linked with mkOutOfStoreSymlink, so edits apply without a rebuild. Adding or removing a skill directory is the exception: ~/.agents/skills links are generated at evaluation time.
  • Changes under flake.nix, hosts/, or modules/ apply only after darwin-rebuild switch.

Permissions

Run these without asking, and fix failures caused by your change:

  • nix eval --raw .#darwinConfigurations.<host>.system.drvPath for each affected host. This is the evaluation check; nix flake check only checks formatting.
  • nix flake check and nix fmt.

Confirm before running:

  • darwin-rebuild switch: requires sudo and changes the live system.
  • nix-collect-garbage: deletes rollback generations.
  • brew install, brew uninstall, or brew cleanup against managed packages: Homebrew state is declared in hosts/<host>/homebrew.nix.

Update flake inputs only when the task is about updating them; ./scripts/update-homebrew-inputs.sh keeps brew and its taps in step.

Git uses conventional commits via cz commit or git cz.

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 · -34 lines · -156 tokens per session ebb47c5333da
  2. 1mo ago Changed · +1 tokens per session 74a1e15ee6c6
  3. 1mo ago First seen · 63 lines · 531 tokens per session scan B c9b6e3619941

Subscribe to this mod's changes

dotfiles AGENTS.md is an instructions file published in the GitHub repository ahonn/dotfiles (63 stars, last pushed 6d ago), licensed MIT. It adds 376 tokens to every session, about $0.0015 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 2026-09-03.

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