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open-northland: Instructions file for Codex

AGENTS.md

open-northland AGENTS.md is an instructions file for Codex, OpenCode from s-nems/open-northland. It costs 2,756 tokens per session, scanned A, original, AGPL-3.0.

Repository instructions for the open-northland project. They describe the project's rules, legal boundaries, code standards, and how agents should work with its content.

In plain words
What is it for?
Use them when editing code or content in open-northland, checking project conventions, or deciding which changes and files are allowed.
Why use it?
They give coding agents the project context they need before making changes, helping avoid rule violations and work outside the repository's boundaries.

Instructions file for CodexOpenCode

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

This is s-nems/open-northland's own configuration. It tells Codex and OpenCode how to work on open-northland 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 open-northland configures →

not rated 19repo +2 changed 13d ago A scan 2,756 tokens AGPL-3.0
View source ↗ s-nems/open-northland opennorthland.org
Reuse

Borrowing it

Nothing to install: this file belongs to s-nems/open-northland. 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/s-nems/open-northland/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/s-nems/open-northland

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 open-northland AGENTS.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/s-nems/open-northland/agents-md"><img src="https://agentmods.dev/badge/instructions/s-nems/open-northland/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 2,756 This file is loaded in full into every session.
When invoked 2,756 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.02756 $0.02756
Opus 5.5 $0.01102 $0.01102
Sonnet 5.5 $0.00551 $0.00551
Haiku 4.5 $0.00276 $0.00276

Measured 13d ago against content hash 13c308fe092f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

open-northland 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 13d 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 · 195 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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.

  1. 13d ago Changed · +9 lines · +219 tokens per session 13c308fe092f
  2. 15d ago Changed · -9 tokens per session 8c9402e5ac95
  3. 18d ago Changed · +2 lines · +29 tokens per session d90b9496ab61
  4. 23d ago Changed · +24 tokens per session e0dc0f364a31
  5. 25d ago Changed · +2 lines · +23 tokens per session 6a4d1baf2ee5
  6. 1mo ago Changed · +1 lines · +26 tokens per session b03a6bd28851
  7. 1mo ago Changed · +1 lines · +29 tokens per session 8c53c7c2bbc0
  8. 1mo ago Changed · +5 lines · +111 tokens per session ec6ce6444b6f
  9. 1mo ago Changed · -7 lines · -127 tokens per session a1c3d700da07
  10. 1mo ago First seen · 182 lines · 2,431 tokens per session scan A c62775c4ab39

Subscribe to this mod's changes

open-northland AGENTS.md is an instructions file published in the GitHub repository s-nems/open-northland (19 stars, last pushed 2d ago), licensed AGPL-3.0. It adds 2,756 tokens to every session, about $0.0110 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.

colony-simculturesdeterministic-simulationgamegame-enginegame-reimplementation
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open-northland AGENTS.mds-nems/open-northlandInstructions file192d agoAGPL-3.0A2,756Codex, OpenCode
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