Borrowing it
Nothing to install: this file belongs to pakkio/mcp-unity. 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/pakkio/mcp-unity/main/AGENTS.mdgit clone --depth 1 https://github.com/pakkio/mcp-unityWrote 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/pakkio/mcp-unity/agents-md)<a href="https://agentmods.dev/instructions/pakkio/mcp-unity/agents-md"><img src="https://agentmods.dev/badge/instructions/pakkio/mcp-unity/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/pakkio/mcp-unity/agents-md"><img src="https://agentmods.dev/badge/instructions/pakkio/mcp-unity/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 | $0.03564 | $0.03564 |
| Opus 5.5 | $0.01426 | $0.01426 |
| Sonnet 5.5 | $0.00713 | $0.00713 |
| Haiku 4.5 | $0.00356 | $0.00356 |
Grade A, and why
mcp-unity 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.
How it starts
The opening of the file, as written. The whole thing — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Unity — AI Agent Guide (MCP Package)
Purpose (what this repo is)
MCP Unity exposes Unity Editor capabilities to MCP-enabled clients by running:
- Unity-side “client” (C# Editor scripts): a WebSocket server inside the Unity Editor that executes tools/resources.
- Node-side “server” (TypeScript): an MCP stdio server that registers MCP tools/resources and forwards requests to Unity over WebSocket.
How it works (high-level data flow)
- MCP client ⇄ (stdio / MCP SDK) ⇄ Node server (
Server~/src/index.ts) - Node server ⇄ (WebSocket JSON-RPC-ish) ⇄ Unity Editor (
Editor/UnityBridge/McpUnityServer.cs+McpUnitySocketHandler.cs) - Tool/Resource names must match exactly across Node and Unity (typically
lower_snake_case).
Key defaults & invariants
- Unity WebSocket endpoint:
ws://localhost:8090/McpUnityby default. - Config file:
ProjectSettings/McpUnitySettings.json(written/read by Unity; read opportunistically by Node). - Execution thread: Tool/resource execution is dispatched via
EditorCoroutineUtilityand runs on the Unity main thread. Keep synchronous work short; use async patterns for long work.
Repo layout (where to change what)
/
├── Editor/ # Unity Editor package code (C#)
│ ├── Tools/ # Tools (inherit McpToolBase)
│ ├── Resources/ # Resources (inherit McpResourceBase)
│ ├── UnityBridge/ # WebSocket server + message routing
│ ├── Services/ # Test/log services used by tools/resources
│ └── Utils/ # Shared helpers (config, logging, workspace integration)
├── Server~/ # Node MCP server (TypeScript, ESM)
│ ├── src/index.ts # Registers tools/resources/prompts with MCP SDK
│ ├── src/tools/ # MCP tool definitions (zod schema + handler)
│ ├── src/resources/ # MCP resource definitions
│ └── src/unity/mcpUnity.ts # WebSocket client that talks to Unity
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 · 229 lines · 3,564 tokens per session scan A 7fafa997c11b
mcp-unity AGENTS.md is an instructions file published in the GitHub repository pakkio/mcp-unity (0 stars, last pushed 2mo ago), licensed MIT. It adds 3,564 tokens to every session, about $0.0143 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.
mcp-unity AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-unity AGENTS.mdpakkio/mcp-unity | Instructions file | 0 | 2mo ago | MIT | A | 3,564 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | 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 | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |