agentsmith: Instructions file for Codex

AGENTS.md

agentsmith AGENTS.md is an instructions file for Codex, OpenCode from PromptPartner/agentsmith. It costs 4,929 tokens per session, scanned D, original, MIT.

A set of project instructions that defines how an AI coding agent should work with a project lead.

In plain words
What is it for?
It guides plain-language explanations, risk-aware command descriptions, project roles, and when the agent should pause and ask for direction.
Why use it?
It keeps the agent's communication, session behavior, and requests for clarification consistent with the project's agreed working rules.

Instructions file for CodexOpenCode

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

This is PromptPartner/agentsmith's own configuration. It tells Codex and OpenCode how to work on agentsmith 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 agentsmith configures →

Reuse

Borrowing it

Nothing to install: this file belongs to PromptPartner/agentsmith. 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/PromptPartner/agentsmith/master/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/PromptPartner/agentsmith

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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Your own site
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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 4,929 This file is loaded in full into every session.
When invoked 4,929 The same file — it is already loaded in full.
Security scan D 2 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 $0.04929 $0.04929
Opus 5.5 $0.01972 $0.01972
Sonnet 5.5 $0.00986 $0.00986
Haiku 4.5 $0.00493 $0.00493

Measured 10d ago against content hash 6ebbd46797e7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade D, and why

agentsmith AGENTS.md scanned grade D with 2 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 10d 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- CORE · system-evolution mindset · universal · this is what makes the harness compound -->

Asks the agent to reveal its instructionsmediumSystem prompt leakage

Directions to print, repeat or translate the system prompt extract configuration the operator did not intend to expose.

and line range), known plan-vs-reality deviations, explicit commit/output instructions, and a tight
AGENTS.md · 334 lines

How it starts

The opening of the file, as written. The whole thing — 334 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Operating Agreement

This file is the contract for how you (the AI agent) work in this project. It is assembled from a universal core (these core/ sections) plus one or more work-type profiles. The core never changes between projects; the profile tailors what "done" means to the kind of work.

Who you're talking to

the project lead is the lead. Role: owner / decision-maker.

They decide direction and accept the risk; you are the technical co-pilot — proactive, evidence-driven, and honest about trade-offs.

When you explain anything:

  • Use plain international English by default. Prefer short sentences, common words, and one idea per sentence. Avoid idioms, slang, cultural references, and unexplained abbreviations. Introduce the correct technical term, then explain it in plain words. Before commands, explain why, what state will change, and the main risks. If the operator uses another language without asking you to use it, note once per session that English is usually more token-efficient, then continue in English. If the operator explicitly asks for another language, use it.
  • Match the explanation to their background — which is uneven, not one dial. Assume fluency where the bio says they are strong and do not pad with basics they own; where it names something they are still learning, give the mental model before the command — what it does, what state it changes, what happens if it goes wrong — and never hand over an incantation to paste. If a topic's level is unknown, ask once and add it to the bio rather than re-guessing every session.
  • Push back on tool/scope creep. If asked to install a new tool, skill, or plugin, ask what problem it solves that the current setup doesn't. A prior setup had 500+ skills and followed none of them.

Read the full file on GitHub · 334 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. 10d ago Changed · -207 lines · -3,555 tokens per session 6ebbd46797e7
  2. 1mo ago Changed · -8 tokens per session 4fafa097a9ec
  3. 2mo ago First seen · 541 lines · 8,492 tokens per session scan D c3872ef5eec5

Subscribe to this mod's changes

agentsmith AGENTS.md is an instructions file published in the GitHub repository PromptPartner/agentsmith (158 stars, last pushed 11d ago), licensed MIT. It adds 4,929 tokens to every session, about $0.0197 per session on Opus 5.5. A static security scan graded it D with 2 findings (hidden instructions, asks the agent to reveal its instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

agentsmith AGENTS.md compared with instructions from other repositories

agentsmith AGENTS.md next to 6 instructions from other repositories
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agentsmith AGENTS.mdPromptPartner/agentsmithInstructions file15811d agoMITD4,929Codex, OpenCode
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next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
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vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode