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Unity-MCP: Instructions file for Codex

AGENTS.md

Unity-MCP AGENTS.md is an instructions file for Codex, OpenCode from IvanMurzak/Unity-MCP. It costs 762 tokens per session, scanned A, original, Apache-2.0.

Repository instructions for Unity-MCP, a bridge that lets AI tools communicate with the Unity game editor and runtime. They describe the project structure, build and release process, and versioned game-server dependency.

In plain words
What is it for?
Use them when working on the Unity package, updating its server version, preparing releases, or following Unity asset and layout rules.
Why use it?
They give a coding agent the project rules needed to change, build, and release this Unity plugin correctly.

Instructions file for CodexOpenCode

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

This is IvanMurzak/Unity-MCP's own configuration. It tells Codex and OpenCode how to work on Unity-MCP 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 Unity-MCP configures →

not rated 4.5krepo +32 changed 6d ago A scan 762 tokens original Apache-2.0
View source ↗ IvanMurzak/Unity-MCP ai-game.dev
About the project

Unity-MCP connects AI coding agents to the Unity game engine through MCP, letting them work with the Unity Editor and running games. It is used by game developers to generate code, automate development and testing, debug projects, and add AI-driven behavior to games. The catalogue entries provide skills, instructions, an MCP integration, and settings for operating this workflow.

IvanMurzak/Unity-MCP · 4,515 stars · on GitHub · ai-game.dev

Reuse

Borrowing it

Nothing to install: this file belongs to IvanMurzak/Unity-MCP. 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/IvanMurzak/Unity-MCP/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/IvanMurzak/Unity-MCP

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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Per session 762 This file is loaded in full into every session.
When invoked 762 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00762 $0.00762
Opus 5.5 $0.00305 $0.00305
Sonnet 5.5 $0.00152 $0.00152
Haiku 4.5 $0.00076 $0.00076

Measured 6d ago against content hash 57b4f457054f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Unity-MCP 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 6d 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 · 46 lines

How it starts

The opening of the file, as written. The whole thing — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Unity-MCP bridges LLMs (Claude, Cursor, Copilot, etc.) with the Unity Editor and Runtime via the Model Context Protocol.

The MCP server is NOT in this repo: the plugin consumes the shared GameDev-MCP-Server (binary gamedev-mcp-server, release assets gamedev-mcp-server-<rid>.zip, Docker aigamedeveloper/mcp-server), one engine-agnostic server shared by Unity-MCP, Godot-MCP and Unreal-MCP. The plugin downloads the release pinned by the ServerVersion constant in Unity-MCP-Plugin/Packages/com.ivanmurzak.unity.mcp/Editor/Scripts/McpServerManager.cs (decoupled from the plugin version). Bumping the consumed server = changing that constant; the pinned v<ServerVersion> release (with all 7 RID zips) must exist BEFORE a plugin release that pins it.

Build / run

  • Bump version: .\commands\bump-version.ps1 <version>.
  • Releases happen only by manually dispatching .github/workflows/release.yml; merging a version bump publishes nothing.
  • Unity .meta files: never hand-write them; Unity generates them on asset refresh.

Layout

  • Unity-MCP-Plugin/ — the Unity project holding the UPM package com.ivanmurzak.unity.mcp (all plugin code and its tests); see its AGENTS.md.
  • cli/ — unity-mcp-cli npm package (TypeScript); see its AGENTS.md.
  • extensions/ — ten optional UPM modules, independent component versions and signed releases.
  • templates/extension/ — inert scaffold; shared tests/releases live in commands/extensions.py and docs/dev/extensions.md.
  • Installer/ — Unity project that builds the installer .unitypackage.
  • Unity-Tests/<unity-version>/ — per-Unity-version test projects referencing the plugin package and all extension packages via file:; prepare with commands/extensions.py before opening.
  • tests/chain-fixtures/ — recorded tool-call fixtures for chain tests, compared byte-for-byte (LF); re-recorded by the plugin's Tests/Editor/Chain/ChainRecordTests.cs, never hand-edited.
  • commands/ — PowerShell/Python utility scripts (version bump, Unity tests, release notes).
  • docs/ — README translations, dev docs (docs/dev/), agent detail docs (docs/agents/).
  • memory/ — durable agent lessons (memory/MEMORY.md is the index).
  • .github/workflows/, .github/scripts/ — CI/CD and its helper scripts.

Read the full file on GitHub · 46 lines

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. 6d ago Changed · +2 lines · +50 tokens per session 57b4f457054f
  2. 11d ago First seen · 44 lines · 712 tokens per session scan A d0c1887c173c

Subscribe to this mod's changes

Unity-MCP AGENTS.md is an instructions file published in the GitHub repository IvanMurzak/Unity-MCP (4,515 stars, last pushed today), licensed Apache-2.0. It adds 762 tokens to every session, about $0.0030 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 2026-10-12.

Game developmentaiai-integrationgame-developmentmcpmcp-serverunity
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