What is agents AGENTS.md?

Project instructions for the arhen/agents repository, covering general agent rules, efficient use of tokens and file tools, response style, and responsibility for changes.

Guiding agent behaviour, file operations, concise responses, and responsibility for repository changes.

They set expectations for how an agent should work and communicate in this repository. This reduces wasted context, careless file handling, and unclear ownership of edits.

How arhen/agents configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to arhen/agents. 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/arhen/agents/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/arhen/agents

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/arhen/agents/agents-md/github.svg)](https://agentmods.dev/instructions/arhen/agents/agents-md)

Your own site

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

Per session 1,857 This file is loaded in full into every session.

When invoked 1,857 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	$0.01857	$0.01857
Opus 5.5	$0.00743	$0.00743
Sonnet 5.5	$0.00371	$0.00371
Haiku 4.5	$0.00186	$0.00186

Measured today against content hash 319f5043856e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agents 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 · 104 lines

The source is not reproduced here

No licence file

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 · +1 lines · +55 tokens per session 319f5043856e
5d ago Changed · +6 lines · +131 tokens per session 7e53f331b08f
6d ago Changed · -11 lines · -426 tokens per session 36fd9a2b0574
9d ago Changed · +17 lines · +403 tokens per session 4efa002db539
20d ago Changed · +9 lines · +140 tokens per session 24662292aec3
22d ago Changed · +1 lines · +94 tokens per session 643e3ff28977
23d ago Changed · +2 lines · +121 tokens per session ad63c7d5cea5
29d ago Changed · +43 tokens per session 8874d78e6bd6
1mo ago Changed · +10 tokens per session 636218be0275
1mo ago First seen · 79 lines · 1,286 tokens per session scan A 07f163f8ec2a

Subscribe to this mod's changes

agents AGENTS.md is an instructions file published in the GitHub repository arhen/agents (13 stars, last pushed yesterday), with no licence file. It adds 1,857 tokens to every session, about $0.0074 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.

agents AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
agents AGENTS.mdarhen/agents	Instructions file	13	yesterday	none	A	1,857	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	275k	3d ago	MIT	A	4,313	Codex, OpenCode

agents: Instructions file for Codex