load_scene · Unity MCP: Risk & Policy

WHAT IT DOES

What load_scene does on Unity MCP

AI agents invoke load_scene to trigger actions in Unity MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why load_scene needs a policy

Loading a scene is an active operation that changes the Unity Editor's runtime state, unloading the current scene and loading a new one. This is not a simple read; it executes a scene transition that can discard unsaved changes and alter the editor environment. It falls under Execute due to its side effects on the running editor state.

From the tool's definition 'Load a scene by name or index' and 'switching between scenes' — actively triggers a scene transition in the Unity Editor, changing application state

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

load_scene Rate-limited

load_scene stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "load_scene": {
      "limits": [
        {
          "counter": "load_scene_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Unity MCP, so you can run agents against it safely.

FAQ

Questions about load_scene

What does the load_scene tool do? +

Load a scene by name or index. Useful for switching between scenes in your project. It is categorised as a Execute tool in the Unity MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on load_scene? +

Register the Unity MCP server in PolicyLayer and add a rule for load_scene: 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. Nothing to install.

What risk level is load_scene? +

load_scene is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit load_scene? +

Yes. Add a rate_limit block to the load_scene 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 load_scene completely? +

Set action: deny in the PolicyLayer policy for load_scene. 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 load_scene? +

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