set_blueprint_class_defaults

A write tool on the Unreal- MCP server.

SERVERUnreal-MCP SOURCEaadeshrao123/unreal-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/aadeshrao123-unreal-mcp/set-blueprint-class-defaults.md

WHAT IT DOES

What set_blueprint_class_defaults does on Unreal-MCP

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

RISK

Why set_blueprint_class_defaults is rated Medium

This tool modifies blueprint class defaults, which are project asset settings that can be reversed or re-edited. While impactful to project state, changes to blueprint defaults are not irreversible deletions (thus not Destructive) and do not execute arbitrary code (thus not Execute). The modification is reversible through the editor UI or undo operations.

From the tool's definition Tool name 'set_blueprint_class_defaults' indicates modification of blueprint class default values in Unreal Engine 5.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_blueprint_class_defaults safely

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

set_blueprint_class_defaults Rate-limited

set_blueprint_class_defaults 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_blueprint_class_defaults": {
      "limits": [
        {
          "counter": "set_blueprint_class_defaults_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-MCP, apply this rule, and every set_blueprint_class_defaults call is checked against it from then on.

FAQ

Questions about set_blueprint_class_defaults

What does the set_blueprint_class_defaults tool do? +

set_blueprint_class_defaults is a write tool on the Unreal MCP server. It is categorised as a Write tool in the Unreal-MCP 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_blueprint_class_defaults? +

Register the Unreal MCP server in PolicyLayer and add a rule for set_blueprint_class_defaults: 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-MCP. Nothing to install.

What risk level is set_blueprint_class_defaults? +

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

Can I rate-limit set_blueprint_class_defaults? +

Yes. Add a rate_limit block to the set_blueprint_class_defaults 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_blueprint_class_defaults completely? +

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

set_blueprint_class_defaults is provided by the Unreal MCP server (aadeshrao123/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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