add_function_output

What add_function_output does on Unreal-MCP

AI agents use add_function_output 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 add_function_output is rated Medium

This tool creates or modifies a Blueprint function by adding an output parameter. It is reversible (parameters can be removed or modified), so it falls under Write rather than Destructive. The severity is medium because misuse could corrupt blueprint logic or break downstream dependencies on that function signature, but the effect is confined to game asset metadata rather than engine-wide or financial impact.

From the tool's definition Tool name 'add_function_output' and description 'Add an output parameter to a Blueprint function' indicate creation/modification of function signatures in Unreal Engine blueprints. This is a reversible modification operation.

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

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

Questions about add_function_output