create_game_object · MCP For Unity MCP: Risk & Policy

WHAT IT DOES

What create_game_object does on MCP For Unity

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

WHY IT NEEDS A POLICY

Why create_game_object needs a policy

This tool creates new objects within the Unity scene, which is a write operation that modifies project data. While reversible (objects can be deleted), it has moderate blast radius because an AI agent could create large numbers of unwanted game objects, cluttering or breaking a scene, or embedding malicious scripts via the sibling create_script tool. Not Destructive because the effect is reversible.

From the tool's definition Tool description explicitly states 'Creates a new GameObject in the Unity Scene' — a reversible creation operation that modifies the project state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_game_object Rate-limited

create_game_object 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": {
    "create_game_object": {
      "limits": [
        {
          "counter": "create_game_object_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about create_game_object

What does the create_game_object tool do? +

Creates a new GameObject in the Unity Scene. It is categorised as a Write tool in the MCP For Unity MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_game_object? +

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

What risk level is create_game_object? +

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

Can I rate-limit create_game_object? +

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

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

create_game_object is provided by the MCP For Unity MCP server (yunuscan/mcpforunity). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.