selection_duplicate · Open Brush MCP Server MCP

WHAT IT DOES

What selection_duplicate does on Open Brush MCP Server

AI agents use selection_duplicate 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 selection_duplicate needs a policy

This tool creates a reversible copy of selected 3D painting elements without permanently destroying or overwriting existing data, fitting the Write category (creates or modifies data reversibly). The severity is medium because while the effect is easily undoable in Open Brush, unintended duplication of complex 3D scenes could consume resources or clutter the workspace, requiring manual cleanup by the user.

From the tool's definition Tool name 'selection_duplicate' and description 'Duplicates current selection' indicate creation of new data (a duplicate of selected 3D painting content) within the Open Brush application.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

selection_duplicate Rate-limited

selection_duplicate 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": {
    "selection_duplicate": {
      "limits": [
        {
          "counter": "selection_duplicate_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 selection_duplicate

What does the selection_duplicate tool do? +

Duplicates current selection. 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 selection_duplicate? +

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

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

Can I rate-limit selection_duplicate? +

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

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

selection_duplicate 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.