This record as markdown: /tools/jjpxdev-unreal-mcp/duplicate-actors.md
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.
| Parameter | Type | Required | Description |
|---|---|---|---|
names | array | Yes | Actor names or labels to duplicate |
offset | object | — | Offset for duplicated actors |
Parameters from the server's own tool schema.
Why duplicate_actors is rated Medium
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
The rule that runs duplicate_actors safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Unreal, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For duplicate_actors, this is the rule to start with:
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.
The button opens the PolicyLayer dashboard: create your workspace, connect Unreal, apply this rule, and every duplicate_actors call is checked against it from then on.
Questions about duplicate_actors
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.
duplicate_actors accepts 2 parameters: names, offset. Required: names. The full parameter table on this page comes from the server's own tool schema.
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.
duplicate_actors is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
duplicate_actors is provided by the Unreal MCP server (@jjpxdev/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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