download_polyhaven_asset · MCP-Blender MCP: Risk & Policy

WHAT IT DOES

What download_polyhaven_asset does on MCP-Blender

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

WHY IT NEEDS A POLICY

Why download_polyhaven_asset needs a policy

This tool downloads an external asset and imports it into Blender, creating new data/objects in the scene. It is reversible (the imported asset can be removed), so it falls under Write rather than Destructive. The blast radius is medium since it modifies the Blender scene and writes files to disk, but does not execute arbitrary code or cause irreversible damage.

From the tool's definition Download and import a PolyHaven asset

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

download_polyhaven_asset Rate-limited

download_polyhaven_asset 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": {
    "download_polyhaven_asset": {
      "limits": [
        {
          "counter": "download_polyhaven_asset_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 MCP-Blender, so you can run agents against it safely.

FAQ

Questions about download_polyhaven_asset

What does the download_polyhaven_asset tool do? +

Download and import a PolyHaven asset. It is categorised as a Write tool in the MCP-Blender MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on download_polyhaven_asset? +

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

What risk level is download_polyhaven_asset? +

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

Can I rate-limit download_polyhaven_asset? +

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

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

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