agent-guides: Instructions file for Codex

AGENTS.md

agent-guides AGENTS.md is an instructions file for Codex, OpenCode from sawrus/agent-guides. It costs 733 tokens per session, scanned A, original, MIT.

A repository instruction file for agent-guides that explains how coding agents should work in the project. It covers loading project-specific guidance, development practices, Git workflow, and Makefile conventions.

In plain words
What is it for?
Use it when working on the agent-guides repository, especially before editing files or using its Git and Makefile workflows. It directs agents to inspect .agent guidance files when present.
Why use it?
It helps an agent find the right local rules before changing code. It also reduces inconsistent Git and project-command practices.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions subagents; mentions Claude Code.

This is sawrus/agent-guides's own configuration. It tells Codex and OpenCode how to work on agent-guides 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 agent-guides configures →

Reuse

Borrowing it

Nothing to install: this file belongs to sawrus/agent-guides. 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/sawrus/agent-guides/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/sawrus/agent-guides

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 agent-guides AGENTS.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/sawrus/agent-guides/agents-md"><img src="https://agentmods.dev/badge/instructions/sawrus/agent-guides/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 733 This file is loaded in full into every session.
When invoked 733 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 $0.00733 $0.00733
Opus 5.5 $0.00293 $0.00293
Sonnet 5.5 $0.00147 $0.00147
Haiku 4.5 $0.00073 $0.00073

Measured yesterday against content hash 0a64b2b0d872, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agent-guides 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 · 54 lines

How it starts

The opening of the file, as written. The whole thing — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS — core guidance

This file loads into every session and every subagent. Keep it short. Put details in skills, scoped rules, and workflows.

Load on demand

  • Read a rule, skill, workflow, or prompt only when the task touches its subject. Rules live in .agent/rules/; read one when a loaded skill or workflow links it. Claude Code loads .claude/rules/ itself.
  • Run a workflow from .agent/workflows/<name>.md only for its command.
  • Before changing project logic, read the matching design or behavior page under docs/**, if one exists.

Scale the process to the task

  • Trivial (a question, a one-line fix): act directly. No plan, no subagents, no extra documents.
  • Small (one module, clear cause): no subagents. Make the change, run the checks, report.
  • Feature or multi-module change: first state acceptance criteria and what is out of scope. Use one read-only explorer subagent (ours or the host's native one) only when the code is unfamiliar and too large to list with one command. After a multi-module diff, use one reviewer subagent (host-native or installed) only for correctness bugs and unmet requirements. A one-module feature needs none.
  • Do not start a subagent for work that one tool call can do.
  • Workflow roles (product-owner, developer, qa, and others) name responsibilities. Delegate a step to a role subagent only when that subagent is installed (team profile); otherwise do the step yourself.

Definition of done

  • After the last edit, run the project checks (Makefile targets such as make test and make lint, or their documented equivalents). Show the command and its result. Do not claim success without that output.
  • Change only what the task needs. List unrelated problems in the report; do not fix them.
  • A user-visible change updates CHANGELOG.md and the matching docs/ page, if one exists. Bump the version and name the CHANGELOG section as the project's release policy says (for example docs/release-policy.md). Without a policy, write under Unreleased, and only a completed feature updates the project version.
  • Add a new file at the repository root only after the user approves its name and purpose.
  • Never run write or maintenance SQL on a non-local database. Ask before using database credentials from .env.

Read the full file on GitHub · 54 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 · +1 lines · +23 tokens per session 0a64b2b0d872
  2. 2d ago Changed · +1 lines · +29 tokens per session 2a154a779377
  3. 6d ago Changed · -85 lines · -598 tokens per session f05b75ee6a13
  4. 14d ago Changed · +12 lines · +202 tokens per session 8288bd8ca5cf
  5. 20d ago Changed · +4 lines · +50 tokens per session 875234340122
  6. 1mo ago First seen · 121 lines · 1,027 tokens per session scan A 358859d35958

Subscribe to this mod's changes

agent-guides AGENTS.md is an instructions file published in the GitHub repository sawrus/agent-guides (19 stars, last pushed today), licensed MIT. It adds 733 tokens to every session, about $0.0029 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.

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