create_primitive · 3D MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_primitive does on 3D MCP Server

AI agents use create_primitive to create or update resources in 3D MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your 3D MCP Server environment.

WHY IT NEEDS A POLICY

Why create_primitive needs a policy

This tool creates new 3D geometry objects in memory/temporary storage. It is a reversible operation (the created primitive can be discarded, modified, or overwritten) with no ability to delete, execute arbitrary code, or access financial systems. The blast radius of misuse is limited to the scope of the 3D modeling session.

From the tool's definition Tool name 'create_primitive' and description indicate it 'Create[s] a 3D primitive shape', which generates new 3D model data without side effects on external systems or destructive operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_primitive Rate-limited

create_primitive 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": {
    "create_primitive": {
      "limits": [
        {
          "counter": "create_primitive_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 3D MCP Server, so you can run agents against it safely.

FAQ

Questions about create_primitive

What does the create_primitive tool do? +

Create a 3D primitive shape (cube, sphere, cylinder, cone, torus). It is categorised as a Write tool in the 3D 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 create_primitive? +

Register the 3D MCP Server MCP server in PolicyLayer and add a rule for create_primitive: 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 3D MCP Server. Nothing to install.

What risk level is create_primitive? +

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

Can I rate-limit create_primitive? +

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

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

create_primitive is provided by the 3D MCP Server MCP server (jagjerez-org/3d-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.