create_material

What create_material does on Unreal-MCP

AI agents use create_material 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.

Why create_material is rated Medium

Material creation in UE5 is a reversible write operation—new materials can be deleted or modified. It does not execute arbitrary code, delete data irreversibly, move funds, or perform destructive actions. The blast radius is limited to the project workspace. Medium severity reflects that an AI agent could waste resources or clutter the project with unwanted materials, but the impact is containable.

From the tool's definition Tool name 'create_material' indicates creation of a new material asset in Unreal Engine 5. The sibling tools (add_blueprint_node, add_component_to_blueprint, add_data_table_row, etc.) all perform reversible creation/modification operations on editor assets.

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

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_material": {
      "limits": [
        {
          "counter": "create_material_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

Questions about create_material