add_niagara_user_parameter

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-niagara-user-parameter.md

WHAT IT DOES

What add_niagara_user_parameter does on Unreal-MCP

AI agents use add_niagara_user_parameter 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_niagara_user_parameter is rated Medium

This tool creates a new user parameter in Niagara (Unreal's particle/VFX system), which is a Write operation—it modifies the editor state reversibly. The parameter can be deleted or modified later. Severity is medium because misuse could corrupt VFX workflows or project state, but the impact is limited to the local editor and reversible.

From the tool's definition Tool name 'add_niagara_user_parameter' indicates it adds/creates a parameter in Niagara VFX system. Sibling tools like 'add_blueprint_node', 'add_component_to_blueprint', and 'add_data_table_row' all follow the 'add_*' pattern which creates or modifies assets…

Attacks that exploit this kind of access

RECOMMENDED RULE

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

add_niagara_user_parameter Rate-limited

add_niagara_user_parameter 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_niagara_user_parameter": {
      "limits": [
        {
          "counter": "add_niagara_user_parameter_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_niagara_user_parameter call is checked against it from then on.

FAQ

Questions about add_niagara_user_parameter

What does the add_niagara_user_parameter tool do? +

add_niagara_user_parameter 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_niagara_user_parameter? +

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

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

Can I rate-limit add_niagara_user_parameter? +

Yes. Add a rate_limit block to the add_niagara_user_parameter 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_niagara_user_parameter completely? +

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

add_niagara_user_parameter 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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