unity_prefab_add_gameobject

Create a new child GameObject inside a prefab asset â€” no scene instance needed. Optionally create as a primitive (Cube, Sphere, etc.) with position/rotation/scale.

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-prefab-add-gameobject.md

WHAT IT DOES

What unity_prefab_add_gameobject does on Unity MCP Server

AI agents use unity_prefab_add_gameobject 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_prefab_add_gameobject is rated Medium

This tool creates or modifies prefab assets by adding new GameObjects, which is a reversible write operation. It does not execute arbitrary code, delete data, move money, or trigger external operations — it simply creates new scene hierarchy elements within a prefab.

From the tool's definition Tool description states 'Create a new child GameObject inside a prefab asset' — the verb 'create' and the fact that it modifies a prefab asset (adds a new child GameObject) indicates data creation/modification without deletion.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_prefab_add_gameobject 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_prefab_add_gameobject, this is the rule to start with:

unity_prefab_add_gameobject Rate-limited

unity_prefab_add_gameobject 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_prefab_add_gameobject": {
      "limits": [
        {
          "counter": "unity_prefab_add_gameobject_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_prefab_add_gameobject call is checked against it from then on.

FAQ

Questions about unity_prefab_add_gameobject

What does the unity_prefab_add_gameobject tool do? +

Create a new child GameObject inside a prefab asset â€” no scene instance needed. Optionally create as a primitive (Cube, Sphere, etc.) with position/rotation/scale. 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_prefab_add_gameobject? +

Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_prefab_add_gameobject: 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_prefab_add_gameobject? +

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

Can I rate-limit unity_prefab_add_gameobject? +

Yes. Add a rate_limit block to the unity_prefab_add_gameobject 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_prefab_add_gameobject completely? +

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

unity_prefab_add_gameobject 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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