set_actor_tags · Unreal MCP: Risk & Policy

WHAT IT DOES

What set_actor_tags does on Unreal

AI agents use set_actor_tags 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_actor_tags needs a policy

This tool creates or modifies actor tags, which are reversible metadata changes to game objects. Tags are configuration data that can be changed or removed later, making this a Write operation rather than Destructive. The severity is medium because incorrect tag assignments could affect actor behavior, visibility, or interactions in the game world, but the changes are non-destructive and can be corrected.

From the tool's definition The tool name is 'set_actor_tags' and the description states it will 'Set tags on an actor.' This modifies actor metadata in Unreal Engine.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_actor_tags Rate-limited

set_actor_tags 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_tags": {
      "limits": [
        {
          "counter": "set_actor_tags_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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_actor_tags

What does the set_actor_tags tool do? +

Set tags on an actor. 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_actor_tags? +

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

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

Can I rate-limit set_actor_tags? +

Yes. Add a rate_limit block to the set_actor_tags 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_tags completely? +

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

set_actor_tags 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.