add_function_input

Add an input parameter to a Blueprint function.

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/add-function-input.md

WHAT IT DOES

What add_function_input does on Unreal-MCP

AI agents use add_function_input 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 add_function_input is rated Medium

This tool modifies blueprint functions by adding input parameters, which is a reversible change to game logic/editor state. It does not execute code, delete data, or move money. It falls under Write category (creates or modifies data reversibly). Severity is medium because misuse could introduce unexpected parameters affecting gameplay or level logic, but changes are reversible and localized to blueprint editing.

From the tool's definition Tool name 'add_function_input' and description 'Add an input parameter to a Blueprint function' indicate creation/modification of function parameters in Unreal Engine blueprints.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

add_function_input Rate-limited

add_function_input 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": {
    "add_function_input": {
      "limits": [
        {
          "counter": "add_function_input_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 add_function_input call is checked against it from then on.

FAQ

Questions about add_function_input

What does the add_function_input tool do? +

Add an input parameter to a Blueprint function. 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 add_function_input? +

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

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

Can I rate-limit add_function_input? +

Yes. Add a rate_limit block to the add_function_input 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 add_function_input completely? +

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

add_function_input 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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