Borrowing it
Nothing to install: this file belongs to IvanMurzak/ai-game-dev-plugin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/IvanMurzak/ai-game-dev-plugin/main/AGENTS.mdgit clone --depth 1 https://github.com/IvanMurzak/ai-game-dev-pluginWrote 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.
[](https://agentmods.dev/instructions/ivanmurzak/ai-game-dev-plugin/agents-md)<a href="https://agentmods.dev/instructions/ivanmurzak/ai-game-dev-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/ivanmurzak/ai-game-dev-plugin/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.
<a href="https://agentmods.dev/instructions/ivanmurzak/ai-game-dev-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/ivanmurzak/ai-game-dev-plugin/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00953 | $0.00953 |
| Opus 5.5 | $0.00381 | $0.00381 |
| Sonnet 5.5 | $0.00191 | $0.00191 |
| Haiku 4.5 | $0.00095 | $0.00095 |
Grade A, and why
ai-game-dev-plugin 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 17d 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.
How it starts
The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Instructions for AI coding agents working inside this repository (read natively by Codex CLI and Claude Code).
What this repo is
ai-game-dev-plugin is a marketplace of game-dev plugins/skills for AI coding agents —
Unreal, Unity & Godot, one plugin each. Every plugin ships a single skill (a runbook) that
teaches the agent to drive that engine's official npm CLI (unreal-mcp-cli, unity-mcp-cli,
godot-cli) so the agent can take a user from nothing to a running editor connected to
ai-game.dev — creating the project, installing the engine plugin, logging
in, and opening the editor, automatically.
It targets both Claude Code and Codex CLI from one source tree.
Layout
.claude-plugin/marketplace.json # Claude Code marketplace catalog
.agents/plugins/marketplace.json # Codex marketplace catalog
.agents/skills/<engine>-game-dev/SKILL.md# Codex repo-native skills (GENERATED — do not hand-edit)
plugins/<engine>/
.claude-plugin/plugin.json # Claude Code plugin manifest
.codex-plugin/plugin.json # Codex plugin manifest
skills/<engine>-game-dev/SKILL.md # CANONICAL runbook (shared by both agents' plugins)
README.md # per-plugin readme (agent-neutral)
scripts/sync-skills.mjs # regenerates .agents/skills/ from the canonical skills
assets/ # README images (banner)
<engine> is one of unreal, unity, godot.
Where new files go:
- Runbook changes: only the canonical
plugins/<engine>/skills/<engine>-game-dev/SKILL.md, then sync. - A new engine plugin:
plugins/<engine>/with the same shape, registered in both marketplace catalogs and in theENGINESlist ofscripts/sync-skills.mjs. - Everything under
plugins/<engine>/ships to users; keep repo-only notes out of it. - Maintenance scripts:
scripts/(dependency-free, Node 18+).
Single source of truth for the skill bodies
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.
- 17d ago Changed · +8 lines · +116 tokens per session 1048f67dda35
- 1mo ago First seen · 70 lines · 837 tokens per session scan A 6f0d2b5e9691
ai-game-dev-plugin AGENTS.md is an instructions file published in the GitHub repository IvanMurzak/ai-game-dev-plugin (5 stars, last pushed 18d ago), licensed Apache-2.0. It adds 953 tokens to every session, about $0.0038 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.