set_preset_property · Unreal MCP: Risk & Policy

WHAT IT DOES

What set_preset_property does on Unreal

AI agents use set_preset_property 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 set_preset_property needs a policy

This tool modifies properties in Unreal Engine via Remote Control Presets, which are configuration mechanisms that expose engine properties for external manipulation. While the modification is reversible (properties can be set back to previous values), it affects engine state and can have significant consequences depending on which properties are modified - from rendering settings to gameplay logic.

From the tool's definition Tool name and description: 'set_preset_property' - 'Set a property value exposed via a Remote Control Preset.' The verb 'Set' indicates modification of data/properties in Unreal Engine.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_preset_property Rate-limited

set_preset_property 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": {
    "set_preset_property": {
      "limits": [
        {
          "counter": "set_preset_property_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 set_preset_property

What does the set_preset_property tool do? +

Set a property value exposed via a Remote Control Preset. 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 set_preset_property? +

Register the Unreal MCP server in PolicyLayer and add a rule for set_preset_property: 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 set_preset_property? +

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

Can I rate-limit set_preset_property? +

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

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

set_preset_property 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.