set_data_layer_state

Set the state of a data layer (Loaded, Activated, Unloaded).

SERVERUnreal SOURCE@jjpxdev/unreal-mcp

Medium RISK CLASS

Category Write

Parameters 22 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/jjpxdev-unreal-mcp/set-data-layer-state.md

WHAT IT DOES

What set_data_layer_state does on Unreal

AI agents use set_data_layer_state 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
`state`	string	Yes	Target state
`layer_name`	string	Yes	Data layer name

Parameters from the server's own tool schema.

RISK

Why set_data_layer_state is rated Medium

This tool creates or modifies data layer states reversibly—a state change can be undone by setting it back to a previous state. It does not permanently delete data (which would be Destructive) nor execute arbitrary code (Execute).

From the tool's definition Tool description states it 'Set[s] the state of a data layer' with options to change it to Loaded, Activated, or Unloaded. This modifies the state of a data layer in the Unreal Engine project.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_data_layer_state 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_data_layer_state, this is the rule to start with:

set_data_layer_state Rate-limited

set_data_layer_state 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_data_layer_state": {
      "limits": [
        {
          "counter": "set_data_layer_state_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 Unreal, apply this rule, and every set_data_layer_state call is checked against it from then on.

FAQ

Questions about set_data_layer_state

What does the set_data_layer_state tool do? +

Set the state of a data layer (Loaded, Activated, Unloaded). 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.

What parameters does set_data_layer_state accept? +

set_data_layer_state accepts 2 parameters: state, layer_name. Required: state, layer_name. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on set_data_layer_state? +

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

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

Can I rate-limit set_data_layer_state? +

Yes. Add a rate_limit block to the set_data_layer_state 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_data_layer_state completely? +

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

set_data_layer_state 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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