apply_niagara_scratch_pad

Commit a scratch pad module's edit-copy to the original script (Apply button).

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/apply-niagara-scratch-pad.md

WHAT IT DOES

What apply_niagara_scratch_pad does on Unreal-MCP

AI agents use apply_niagara_scratch_pad 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 apply_niagara_scratch_pad is rated Medium

This tool creates or modifies Niagara VFX scripts by committing edited copies back to the original. While the changes could theoretically be undone via undo/version control, the tool itself performs a Write operation (persistent modification of game assets). It does not delete data (ruling out Destructive), execute arbitrary code (Execute), or move money (Financial).

From the tool's definition The tool description states it "Commit[s] a scratch pad module's edit-copy to the original script (Apply button)", which modifies the Niagara VFX script by persisting edits.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

apply_niagara_scratch_pad Rate-limited

apply_niagara_scratch_pad 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": {
    "apply_niagara_scratch_pad": {
      "limits": [
        {
          "counter": "apply_niagara_scratch_pad_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 apply_niagara_scratch_pad call is checked against it from then on.

FAQ

Questions about apply_niagara_scratch_pad

What does the apply_niagara_scratch_pad tool do? +

Commit a scratch pad module's edit-copy to the original script (Apply button). 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 apply_niagara_scratch_pad? +

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

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

Can I rate-limit apply_niagara_scratch_pad? +

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

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

apply_niagara_scratch_pad 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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