model_import · Open Brush MCP Server MCP: Risk & Policy

WHAT IT DOES

What model_import does on Open Brush MCP Server

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

WHY IT NEEDS A POLICY

Why model_import needs a policy

This tool adds external 3D model data into the Open Brush scene, which is a reversible modification operation. It doesn't execute arbitrary code, delete data irreversibly, or move money—it simply ingests and integrates a model into the current drawing/scene state. This is analogous to a 'Write' operation (create/modify data).

From the tool's definition Tool name 'model_import' and description 'Imports a 3D model from Media Library/Models' indicates creation/addition of content to the Open Brush workspace.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

model_import Rate-limited

model_import 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": {
    "model_import": {
      "limits": [
        {
          "counter": "model_import_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 Open Brush MCP Server, so you can run agents against it safely.

FAQ

Questions about model_import

What does the model_import tool do? +

Imports a 3D model from Media Library/Models. It is categorised as a Write tool in the Open Brush 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 model_import? +

Register the Open Brush MCP Server MCP server in PolicyLayer and add a rule for model_import: 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 Open Brush MCP Server. Nothing to install.

What risk level is model_import? +

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

Can I rate-limit model_import? +

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

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

model_import is provided by the Open Brush MCP Server MCP server (moz411/openbrush-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.