duplicate_actors · Unreal MCP: Risk & Policy

WHAT IT DOES

What duplicate_actors does on Unreal

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

WHY IT NEEDS A POLICY

Why duplicate_actors needs a policy

Duplicating actors creates new game objects within the Unreal Engine environment. This is a Write operation because it modifies the scene by adding new content (copies), but the changes are reversible through undo functionality or deletion.

From the tool's definition Tool name: 'duplicate_actors' with description 'Duplicate actors by name.' The action creates copies of existing actors in the Unreal Engine scene, which is a reversible modification of the project state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

duplicate_actors Rate-limited

duplicate_actors 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": {
    "duplicate_actors": {
      "limits": [
        {
          "counter": "duplicate_actors_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about duplicate_actors

What does the duplicate_actors tool do? +

Duplicate actors by name. It is categorised as a Write tool in the Unreal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on duplicate_actors? +

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

What risk level is duplicate_actors? +

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

Can I rate-limit duplicate_actors? +

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

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

duplicate_actors is provided by the Unreal MCP server (sam-david/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.