material_assign

Assign a material to an object.

SERVERBlender Copilot MCP Server SOURCEdwgx/blender-copilot

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/dwgx-blender-copilot/material-assign.md

WHAT IT DOES

What material_assign does on Blender Copilot MCP Server

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

RISK

Why material_assign is rated Medium

Assigning materials is a non-destructive write operation that modifies object attributes. While it changes the scene state, the operation is reversible (materials can be reassigned or removed). It does not execute arbitrary code, delete data, or commit financial transactions.

From the tool's definition Tool description states 'Assign a material to an object' — this modifies the material properties of a Blender object, which is a reversible creation/modification action.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs material_assign safely

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

material_assign Rate-limited

material_assign 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": {
    "material_assign": {
      "limits": [
        {
          "counter": "material_assign_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 Blender Copilot MCP Server, apply this rule, and every material_assign call is checked against it from then on.

FAQ

Questions about material_assign

What does the material_assign tool do? +

Assign a material to an object. It is categorised as a Write tool in the Blender Copilot 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 material_assign? +

Register the Blender Copilot MCP Server MCP server in PolicyLayer and add a rule for material_assign: 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 Blender Copilot MCP Server. Nothing to install.

What risk level is material_assign? +

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

Can I rate-limit material_assign? +

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

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

material_assign is provided by the Blender Copilot MCP Server MCP server (dwgx/blender-copilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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