set_actor_properties

A write tool on the Uefn MCP server.

SERVERUefn SOURCEquangdang46/uefn-verse-mcp

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/quangdang46-uefn-verse-mcp/set-actor-properties.md

WHAT IT DOES

What set_actor_properties does on Uefn

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

RISK

Why set_actor_properties is rated Medium

This tool creates or modifies actor properties within the Unreal editor, which is a reversible Write operation. While the description is empty (lowering confidence slightly), the name combined with sibling context clearly indicates property modification rather than deletion, execution of arbitrary code, or financial operations.

From the tool's definition Tool name 'set_actor_properties' indicates modification of actor properties in Unreal Editor. The server context (UEFN - Unreal Editor for Fortnite) and sibling tools like 'actor_move_to_folder', 'actor_set_label', 'actor_show', 'actor_unlock' confirm this is…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_actor_properties safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Uefn, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_actor_properties, this is the rule to start with:

set_actor_properties Rate-limited

set_actor_properties 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_actor_properties": {
      "limits": [
        {
          "counter": "set_actor_properties_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 Uefn, apply this rule, and every set_actor_properties call is checked against it from then on.

FAQ

Questions about set_actor_properties

What does the set_actor_properties tool do? +

set_actor_properties is a write tool on the Uefn MCP server. It is categorised as a Write tool in the Uefn 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_actor_properties? +

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

What risk level is set_actor_properties? +

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

Can I rate-limit set_actor_properties? +

Yes. Add a rate_limit block to the set_actor_properties 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_actor_properties completely? +

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

set_actor_properties is provided by the Uefn MCP server (quangdang46/uefn-verse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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