What is foundation AGENTS.md?

Repository instructions for Foundation, explaining its terminology, project context, agent rules, and technology choices.

Use them when working on the Foundation codebase or making decisions about its implementation.

They give a coding agent the background needed to interpret the project correctly.

How nmxmxh/foundation configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to nmxmxh/foundation. 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/nmxmxh/foundation/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/nmxmxh/foundation

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

Your own site

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

Per session 4,382 This file is loaded in full into every session.

When invoked 4,382 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	$0.04382	$0.04382
Opus 5.5	$0.01753	$0.01753
Sonnet 5.5	$0.00876	$0.00876
Haiku 4.5	$0.00438	$0.00438

Measured 5d ago against content hash 9acc014266b0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

foundation 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 5d 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 · 331 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

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.

5d ago Changed · +1 lines · +27 tokens per session 9acc014266b0
13d ago Changed · +1 lines · +19 tokens per session b608696b46eb
1mo ago Changed · +1 lines · +22 tokens per session 1159958a7774
1mo ago Changed · +8 tokens per session 9ae8f7fedac7
2mo ago Changed · +1 lines · +23 tokens per session 565894c19de3
2mo ago First seen · 327 lines · 4,283 tokens per session scan A 37b9ee74046e

Subscribe to this mod's changes

foundation AGENTS.md is an instructions file published in the GitHub repository nmxmxh/foundation (12 stars, last pushed 5d ago), with no licence file. It adds 4,382 tokens to every session, about $0.0175 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 2026-09-02.

Building agents Go artificial-intelligence capnproto protocol-buffers web-assembly zero-copy

foundation AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
foundation AGENTS.mdnmxmxh/foundation	Instructions file	12	5d ago	none	A	4,382	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

foundation: Instructions file for Codex