draw_ellipse · AutoCAD MCP Server MCP: Risk & Policy

WHAT IT DOES

What draw_ellipse does on AutoCAD MCP Server

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

WHY IT NEEDS A POLICY

Why draw_ellipse needs a policy

Drawing an ellipse modifies the CAD document by adding new geometric shapes. This is a reversible operation (the drawn ellipse can be deleted or modified later), so it falls under Write rather than Destructive. While it does trigger an action in an external application (AutoCAD), it is not executing arbitrary code or shell commands, so it is not Execute. The blast radius is limited to the current drawing file.

From the tool's definition Tool name 'draw_ellipse' and description state it draws an ellipse, which creates new geometric data in the CAD file.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

draw_ellipse Rate-limited

draw_ellipse 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": {
    "draw_ellipse": {
      "limits": [
        {
          "counter": "draw_ellipse_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches AutoCAD MCP Server, so you can run agents against it safely.

FAQ

Questions about draw_ellipse

What does the draw_ellipse tool do? +

Draw an ellipse with specified center, axes, and rotation in AutoCAD. It is categorised as a Write tool in the AutoCAD 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 draw_ellipse? +

Register the AutoCAD MCP Server MCP server in PolicyLayer and add a rule for draw_ellipse: 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 AutoCAD MCP Server. Nothing to install.

What risk level is draw_ellipse? +

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

Can I rate-limit draw_ellipse? +

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

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

draw_ellipse is provided by the AutoCAD MCP Server MCP server (porta048/autocad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.