model_position · Open Brush MCP Server MCP: Risk & Policy

WHAT IT DOES

What model_position does on Open Brush MCP Server

AI agents use model_position 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_position needs a policy

This tool modifies the position of an existing 3D model within the scene, which is a reversible write/update operation. It does not delete data, execute arbitrary code, or involve financial transactions. Misuse could displace models unexpectedly, but the operation can be undone by repositioning.

From the tool's definition Moves a 3D model to given coordinates

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

model_position Rate-limited

model_position 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_position": {
      "limits": [
        {
          "counter": "model_position_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_position

What does the model_position tool do? +

Moves a 3D model to given coordinates. 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_position? +

Register the Open Brush MCP Server MCP server in PolicyLayer and add a rule for model_position: 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_position? +

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

Can I rate-limit model_position? +

Yes. Add a rate_limit block to the model_position 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_position completely? +

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

model_position 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.