Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/ivanmurzak/ai-game-dev-plugin/unity-game-devnpx skills add IvanMurzak/ai-game-dev-plugin --skill unity-game-devgit clone --depth 1 https://github.com/IvanMurzak/ai-game-dev-pluginWhat 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 | $0.00058 | $0.01787 |
| Opus 5 | $0.00029 | $0.00894 |
| Sonnet 5 | $0.00012 | $0.00357 |
| Haiku 4.5 | $0.00006 | $0.00179 |
Grade A, and why
unity-game-dev 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 2d 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 — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Unity — AI Game Dev runbook
This skill teaches your AI coding assistant (Claude Code or Codex CLI) to drive Unity fully
automatically through the unity-mcp-cli npm package. The goal: take the user from nothing to a
running Unity Editor that is connected to ai-game.dev so the AI can
build the game for them.
Every command runs via npx so nothing needs to be installed globally:
npx -y unity-mcp-cli@latest <command> [args]
Prerequisites (check first)
- Node.js 18+ —
node --version. - Unity Hub + a Unity Editor installed (e.g. Unity 6).
create-projectuses Unity Hub to scaffold and to resolve the editor version; the requested version must be installed. - A free ai-game.dev account — the
loginstep authorizes the project against the cloud. - Windows / macOS / Linux with a real desktop session (the editor opens a window).
The automatic end-to-end sequence
Run these in order. Do not skip the ordering rule around close → login → open.
1. Create the project (fresh start only)
Skip this step if the user already has a project — go straight to step 2 pointing at it.
npx -y unity-mcp-cli@latest create-project "C:/Games/MyGame" --unity 6000.0.0f1
create-project <path>scaffolds a new Unity project at<path>via Unity Hub.--unity <version>selects the installed editor version (must be installed in the Hub).
Verify: the <path> now contains Assets/, Packages/, and ProjectSettings/.
2. Install the Unity-MCP plugin
npx -y unity-mcp-cli@latest install-plugin "C:/Games/MyGame"
Patches Packages/manifest.json to add the Unity-MCP package so the editor can expose its
tools to the cloud AI. Verify: Packages/manifest.json now references the AI Game Developer
package.
3. Close the editor before logging in
npx -y unity-mcp-cli@latest close "C:/Games/MyGame"
# add --force if the editor won't exit cleanly
This ordering is critical. The editor must not be running when you log in, because it
reads the auth token from the project's UserSettings only at startup. If it is already open it
would run with a stale (or missing) token. Always close before login. Use --force only if
a normal close fails.
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.
- 2d ago First seen · 161 lines · 58 tokens per session scan A e0f66354841c
unity-game-dev is a skill published in the GitHub repository IvanMurzak/ai-game-dev-plugin (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 58 tokens to every session and 1,787 once invoked, about $0.0003 per session on Opus 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 skills, from other repositories
unity-coder
Use when implementing Unity C# code to follow proper coding guidelines, naming conventions, member ordering, and Unity-specific patterns.
unity-tests-write
Use when writing Unity tests, including EditMode tests, PlayMode tests, performance testing, and code coverage.
unity-architect
Use when designing Unity architecture, creating component hierarchies, defining interfaces, or generating test stubs and Mermaid diagrams for Unity projects.
unity-dev
Start Unity C# development workflow with architecture, implementation, review, and testing phases.
unity-run
Use when running Unity from CLI for any purpose — builds, tests, method execution, asset imports. Handles Unity installation detection, batchmode execution, and log monitoring. Other unity-dev skills depend on this for CLI execution.
unity-tests-run
Run Unity Test Framework tests via CLI batchmode with auto-detection of Unity installation.