create_blueprint_function

What create_blueprint_function does on Unreal-MCP

AI agents use create_blueprint_function 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_blueprint_function is rated Medium

Creating a new function in a Blueprint modifies the Blueprint's state but does not execute code or trigger external operations—it is a Write operation. The modification is reversible (the function can be deleted). Severity is medium because while this could be misused to inject malicious logic into a game project, the effect is confined to the editor and requires further steps (compilation, execution) to cause harm.

From the tool's definition Tool name is 'create_blueprint_function' and description states 'Create a new function in a Blueprint.' This is a creation operation that modifies Blueprint data structures reversibly.

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

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

Questions about create_blueprint_function