set_niagara_float

Set a float parameter on a Niagara component.

SERVERUnreal SOURCE@jjpxdev/unreal-mcp

Medium RISK CLASS

Category Write

Parameters 33 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/jjpxdev-unreal-mcp/set-niagara-float.md

WHAT IT DOES

What set_niagara_float does on Unreal

AI agents use set_niagara_float to create or update resources in Unreal, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unreal environment.

Parameter	Type	Required	Description
`value`	number	Yes	Float value
`actor_name`	string	Yes	Actor with Niagara component
`parameter_name`	string	Yes	Parameter name

Parameters from the server's own tool schema.

RISK

Why set_niagara_float is rated Medium

This tool creates or modifies data (Niagara float parameters) in a reversible manner. While it affects visual effects rendering, parameter changes are not destructive—they can be undone by setting alternative values. The blast radius is medium: an AI agent could produce unintended visual effects, performance issues, or confusing VFX behavior, but cannot permanently delete assets or execute arbitrary code.

From the tool's definition Tool name 'set_niagara_float' and description 'Set a float parameter on a Niagara component' indicate modification of Niagara (VFX system) parameters. The verb 'set' modifies component state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_niagara_float safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Unreal, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_niagara_float, this is the rule to start with:

set_niagara_float Rate-limited

set_niagara_float 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": {
    "set_niagara_float": {
      "limits": [
        {
          "counter": "set_niagara_float_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, apply this rule, and every set_niagara_float call is checked against it from then on.

FAQ

Questions about set_niagara_float

What does the set_niagara_float tool do? +

Set a float parameter on a Niagara component. It is categorised as a Write tool in the Unreal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does set_niagara_float accept? +

set_niagara_float accepts 3 parameters: value, actor_name, parameter_name. Required: value, actor_name, parameter_name. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on set_niagara_float? +

Register the Unreal MCP server in PolicyLayer and add a rule for set_niagara_float: 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. Nothing to install.

What risk level is set_niagara_float? +

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

Can I rate-limit set_niagara_float? +

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

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

set_niagara_float is provided by the Unreal MCP server (@jjpxdev/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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