This record as markdown: /tools/jjpxdev-unreal-mcp/set-actor-tags.md
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.
| Parameter | Type | Required | Description |
|---|---|---|---|
name | string | Yes | Actor name or label |
tags | array | Yes | Tags to set |
Parameters from the server's own tool schema.
Why set_actor_tags is rated Medium
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
The rule that runs set_actor_tags 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 set_actor_tags, this is the rule to start with:
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.
The button opens the PolicyLayer dashboard: create your workspace, connect Unreal, apply this rule, and every set_actor_tags call is checked against it from then on.
Questions about set_actor_tags
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.
set_actor_tags accepts 2 parameters: name, tags. Required: name, tags. 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 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.
set_actor_tags 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 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.
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.
set_actor_tags 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.
More on Unreal, and thousands of servers like it.
This server
Across the catalogue