dotfiles: Instructions file for Codex

AGENTS.md

dotfiles AGENTS.md is an instructions file for Codex, OpenCode from ulises-jeremias/dotfiles. It costs 358 tokens per session, scanned A, original, MIT.

A set of guidelines for HorneroConfig, a dotfiles project for configuring a user's development environment. It describes design principles such as theme support, modularity, centralized configuration, fallbacks, and secure defaults, plus shell-script conventions.

In plain words
What is it for?
Use it when creating or editing HorneroConfig themes, configuration systems, user scripts, command-line options, logging, or dependency fallbacks.
Why use it?
It gives agents consistent rules for writing reliable configuration and scripts that handle missing optional dependencies safely.

Instructions file for CodexOpenCode

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

This is ulises-jeremias/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 ulises-jeremias/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/ulises-jeremias/dotfiles/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/ulises-jeremias/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.

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README.md
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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.

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Per session 358 This file is loaded in full into every session.
When invoked 358 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 $0.00358 $0.00358
Opus 5.5 $0.00143 $0.00143
Sonnet 5.5 $0.00072 $0.00072
Haiku 4.5 $0.00036 $0.00036

Measured 27d ago against content hash e1809bfb5654, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

dotfiles 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 27d 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.

AGENTS.md · 36 lines

What it actually says

Contributor guide

This repository is a personal chezmoi source for an Arch workstation. It is not the source of HorneroOS system packages, Shell behavior, or theme-pack metadata; those belong to the HorneroOS organization.

Core rules

  • Prefer declarative chezmoi files for user configuration.
  • Use horneroctl for supported Hornero desktop operations. Do not add a second script framework or compatibility layer in this source.
  • Keep Hornero appearance pack metadata in HorneroOS/config. This repository may provide optional wallpaper media under home/dot_local/share/hornero/wallpapers/.
  • Use XDG paths and the Hornero namespace for new product-specific state.
  • Never run chezmoi apply against the developer's account during tests.
  • Render chezmoi templates with both managed-host and static configurations.
  • Keep historical workstation notes in docs/wiki/ clearly identified as historical; they do not define current product contracts.
  • Never commit credentials, private keys, personal host facts, or generated caches.

Validation

Run the focused contract tests, scripts/audit-horneroctl-binds.sh, scripts/verify-delivery.sh, and the relevant chezmoi template checks. Use a temporary HOME and isolated XDG directories for runtime tests.

Product references

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. 27d ago Changed · -2 tokens per session e1809bfb5654
  2. 1mo ago Changed · -38 lines · -420 tokens per session f6c0ee57820d
  3. 1mo ago Changed 7ad88bea83a1
  4. 2mo ago First seen · 74 lines · 780 tokens per session scan A 85a19c788810

Subscribe to this mod's changes

dotfiles AGENTS.md is an instructions file published in the GitHub repository ulises-jeremias/dotfiles (135 stars, last pushed 6d ago), licensed MIT. It adds 358 tokens to every session, about $0.0014 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 2026-08-30.

Related

dotfiles AGENTS.md compared with instructions from other repositories

dotfiles AGENTS.md next to 6 instructions from other repositories
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