What is LowLevelDigger AGENTS.md?

Project instructions for a Unity 6.3 sample game using the new Low Level 2D Physics feature, based on Box2D version 3. They point agents to the project's reference documentation and samples.

Use them when developing or debugging this Unity physics sample. Consult the included documentation and examples when implementing the feature.

They provide project-specific context for a newer physics feature whose behavior may not be familiar or fully documented elsewhere.

How keijiro/LowLevelDigger configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to keijiro/LowLevelDigger. 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/keijiro/LowLevelDigger/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/keijiro/LowLevelDigger

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

Your own site

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

Per session 157 This file is loaded in full into every session.

When invoked 157 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.

Model	Per session	Once invoked
Fable 5.1	$0.00157	$0.00157
Opus 5.5	$0.00063	$0.00063
Sonnet 5.5	$0.00031	$0.00031
Haiku 4.5	$0.00016	$0.00016

Measured 2mo ago against content hash 6475ba667968, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

LowLevelDigger 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 2mo 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 · 17 lines

What it actually says

This project is for building a sample game using Unity 6.3's new Low Level 2D Physics feature.

This directory itself is a Unity project, and reference materials are stored under References.

References/Documentation - partial documentation of Low Level 2D Physics
References/LowLevelSamples - official samples of Low Level 2D Physics

Because Low Level 2D Physics is a new feature, there will likely be many aspects beyond your (agent) knowledge. When working, please refer to these materials as needed.

Also, because Low Level 2D Physics is based on Box2D v3, there are many situations where you can apply your Box2D knowledge directly. Please keep that in mind at all times.

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.

2mo ago First seen · 17 lines · 157 tokens per session scan A 6475ba667968

Subscribe to this mod's changes

LowLevelDigger AGENTS.md is an instructions file published in the GitHub repository keijiro/LowLevelDigger (95 stars, last pushed 9mo ago), licensed Unlicense. It adds 157 tokens to every session, about $0.0006 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.

Game development

LowLevelDigger AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
LowLevelDigger AGENTS.mdkeijiro/LowLevelDigger	Instructions file	95	9mo ago	Unlicense	A	157	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	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	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

LowLevelDigger: Instructions file for Codex