assign_material

Apply a material to a GameObject by setting its ModelRenderer

SERVERSbox SOURCEsbox-mcp-server

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/sbox/assign-material.md

WHAT IT DOES

What assign_material does on Sbox

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

RISK

Why assign_material is rated Medium

Modifies game object properties reversibly; changes visual appearance but does not execute arbitrary code or destroy data.

From the tool's definition Apply a material to a GameObject by setting its ModelRenderer

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs assign_material safely

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

assign_material Rate-limited

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

FAQ

Questions about assign_material

What does the assign_material tool do? +

Apply a material to a GameObject by setting its ModelRenderer. It is categorised as a Write tool in the Sbox MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on assign_material? +

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

What risk level is assign_material? +

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

Can I rate-limit assign_material? +

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

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

assign_material is provided by the Sbox MCP server (sbox-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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