niagara_set_parameter

THE RISK

Medium Risk

Why niagara_set_parameter needs a policy

The tool modifies parameter state in a Niagara system (particle effects), which is reversible and non-destructive. This aligns with Write category (creates/modifies data reversibly). Confidence is reduced due to empty description, but the name structure strongly suggests parameter modification within the UEFN editor environment, which typically supports undo/redo.

From the tool's definition Tool name 'niagara_set_parameter' indicates it sets/modifies a parameter in Niagara (Unreal's particle/visual effects system). The 'set' verb and the context of an editor tool suggest data modification. Description is empty, limiting certainty.

Documented attack patterns abuse exactly the kind of access niagara_set_parameter gives an agent:

POLICY

How to control niagara_set_parameter

PolicyLayer is an MCP gateway — it sits between your AI agents and Uefn, and nothing reaches the server without passing your rules. This is the rule we recommend for niagara_set_parameter:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "niagara_set_parameter": {
      "limits": [
        {
          "counter": "niagara_set_parameter_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

niagara_set_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.

Create a free account and register Uefn — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Destructive delete_actors Delete actors by their labels. Destructive delete_asset Delete an asset. Destructive tag_remove tag_remove Destructive shutdown Stop the MCP listener. Destructive snapshot_restore Restore the level to a previously saved snapshot state. Destructive undo Undo the last editor action via the transaction system. Execute batch_exec Execute multiple bridge commands in a single editor tick — faster than sending one-by-one. Execute blueprint_compile Compile a Blueprint asset and return compilation status.

All 143 Uefn tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about niagara_set_parameter

What does the niagara_set_parameter tool do? +

niagara_set_parameter. It is categorised as a Write tool in the Uefn MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on niagara_set_parameter? +

Register the Uefn MCP server in PolicyLayer and add a rule for niagara_set_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 Uefn. Nothing to install.

What risk level is niagara_set_parameter? +

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

Can I rate-limit niagara_set_parameter? +

Yes. Add a rate_limit block to the niagara_set_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 niagara_set_parameter completely? +

Set action: deny in the PolicyLayer policy for niagara_set_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 niagara_set_parameter? +

niagara_set_parameter is provided by the Uefn MCP server (quangdang46/uefn-verse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Uefn tool call.

Start from Uefn, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →