set_material_3d · Godot MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_material_3d does on Godot MCP Server

AI agents use set_material_3d to create or update resources in Godot MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Godot MCP Server environment.

WHY IT NEEDS A POLICY

Why set_material_3d needs a policy

This tool creates and modifies material properties on a 3D mesh instance. While this modifies game state, it is reversible (materials can be changed, replaced, or removed without data loss). It does not execute arbitrary code, delete data, or cause financial transactions. It falls under Write category as a scene/asset modification operation.

From the tool's definition Tool performs 'Create and assign a StandardMaterial3D' to a MeshInstance3D. These are material property modifications that change scene state but are reversible.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_material_3d Rate-limited

set_material_3d 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_material_3d": {
      "limits": [
        {
          "counter": "set_material_3d_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Godot MCP Server, so you can run agents against it safely.

FAQ

Questions about set_material_3d

What does the set_material_3d tool do? +

Create and assign a StandardMaterial3D (or BaseMaterial3D) to a MeshInstance3D. It is categorised as a Write tool in the Godot MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_material_3d? +

Register the Godot MCP Server MCP server in PolicyLayer and add a rule for set_material_3d: 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 Godot MCP Server. Nothing to install.

What risk level is set_material_3d? +

set_material_3d is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_material_3d? +

Yes. Add a rate_limit block to the set_material_3d 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_material_3d completely? +

Set action: deny in the PolicyLayer policy for set_material_3d. 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_material_3d? +

set_material_3d is provided by the Godot MCP Server MCP server (neondeex/godotmcp-pro-free-client). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.