sketch_ellipse · Solidworks MCP: Risk & Policy

WHAT IT DOES

What sketch_ellipse does on Solidworks

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

WHY IT NEEDS A POLICY

Why sketch_ellipse needs a policy

This tool creates a new geometric element (ellipse) within an active SolidWorks sketch. It is a reversible write operation — the ellipse can be deleted or undone — with minimal blast radius as it only affects the current sketch context.

From the tool's definition Draw an ellipse in the active sketch

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sketch_ellipse Rate-limited

sketch_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": {
    "sketch_ellipse": {
      "limits": [
        {
          "counter": "sketch_ellipse_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 Solidworks, so you can run agents against it safely.

FAQ

Questions about sketch_ellipse

What does the sketch_ellipse tool do? +

Draw an ellipse in the active sketch. It is categorised as a Write tool in the Solidworks MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sketch_ellipse? +

Register the Solidworks MCP server in PolicyLayer and add a rule for sketch_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 Solidworks. Nothing to install.

What risk level is sketch_ellipse? +

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

Can I rate-limit sketch_ellipse? +

Yes. Add a rate_limit block to the sketch_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 sketch_ellipse completely? +

Set action: deny in the PolicyLayer policy for sketch_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 sketch_ellipse? +

sketch_ellipse is provided by the Solidworks MCP server (solidworks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.