unity_scene_open

Open a scene by its asset path (relative to Assets/). Refuses if any loaded scene has

SERVERUnity MCP Server SOURCEanklebreaker-studio/unity-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/anklebreaker-studio-unity-mcp-server/unity-scene-open.md

WHAT IT DOES

What unity_scene_open does on Unity MCP Server

AI agents use unity_scene_open to create or update resources in Unity MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unity MCP Server environment.

RISK

Why unity_scene_open is rated Medium

Opening a scene in Unity Editor modifies the current editor state, which is a reversible operation (you can open a different scene or close it). This is Write-category behavior rather than Read (which would only query scene information). It's not Execute because it doesn't run arbitrary code or shell commands, though it may trigger scene initialization callbacks.

From the tool's definition Tool name 'unity_scene_open' and description 'Open a scene by its asset path' indicates it loads/activates a scene.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_scene_open safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Unity MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For unity_scene_open, this is the rule to start with:

unity_scene_open Rate-limited

unity_scene_open stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unity_scene_open": {
      "limits": [
        {
          "counter": "unity_scene_open_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Unity MCP Server, apply this rule, and every unity_scene_open call is checked against it from then on.

FAQ

Questions about unity_scene_open

What does the unity_scene_open tool do? +

Open a scene by its asset path (relative to Assets/). Refuses if any loaded scene has. It is categorised as a Write tool in the Unity MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unity_scene_open? +

Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_scene_open: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Unity MCP Server. Nothing to install.

What risk level is unity_scene_open? +

unity_scene_open is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit unity_scene_open? +

Yes. Add a rate_limit block to the unity_scene_open rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block unity_scene_open completely? +

Set action: deny in the PolicyLayer policy for unity_scene_open. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides unity_scene_open? +

unity_scene_open is provided by the Unity MCP Server MCP server (anklebreaker-studio/unity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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