set_texture · Blender MCP: Risk & Policy

WHAT IT DOES

What set_texture does on BlenderMCP

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

WHY IT NEEDS A POLICY

Why set_texture needs a policy

The tool modifies object properties (texture/material assignment) but does not delete data, execute arbitrary code, or create irreversible changes. Texture application is a Write operation—it updates object state reversibly. Severity is medium because misuse could result in unwanted visual modifications to a 3D scene, but changes are easily undone.

From the tool's definition Tool description states 'Apply a previously downloaded Polyhaven texture to an object', which modifies the material/appearance properties of a 3D object in Blender. This is a reversible change to scene state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_texture Rate-limited

set_texture 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_texture": {
      "limits": [
        {
          "counter": "set_texture_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 BlenderMCP, so you can run agents against it safely.

FAQ

Questions about set_texture

What does the set_texture tool do? +

Apply a previously downloaded Polyhaven texture to an object. It is categorised as a Write tool in the BlenderMCP 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_texture? +

Register the Blender MCP server in PolicyLayer and add a rule for set_texture: 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 BlenderMCP. Nothing to install.

What risk level is set_texture? +

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

Can I rate-limit set_texture? +

Yes. Add a rate_limit block to the set_texture 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_texture completely? +

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

set_texture is provided by the Blender MCP server (opslon/blender-mcp-optimized). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.