add_mass_config_trait

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/add-mass-config-trait.md

WHAT IT DOES

What add_mass_config_trait does on Unreal-MCP

AI agents use add_mass_config_trait 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_mass_config_trait is rated Medium

This tool creates or modifies Unreal Engine Mass Entity configuration traits, which is a reversible Write operation. While it could have downstream effects on game logic, it does not execute arbitrary code, delete data irreversibly, or move financial resources. The empty description lowers confidence slightly, but the tool name and sibling context strongly suggest reversible data modification.

From the tool's definition Tool name 'add_mass_config_trait' indicates adding/creating configuration for Mass Entity system traits in Unreal Engine.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

add_mass_config_trait Rate-limited

add_mass_config_trait 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_mass_config_trait": {
      "limits": [
        {
          "counter": "add_mass_config_trait_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_mass_config_trait call is checked against it from then on.

FAQ

Questions about add_mass_config_trait

What does the add_mass_config_trait tool do? +

add_mass_config_trait 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 add_mass_config_trait? +

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

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

Can I rate-limit add_mass_config_trait? +

Yes. Add a rate_limit block to the add_mass_config_trait 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_mass_config_trait completely? +

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

add_mass_config_trait 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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