sketch_ellipse

THE RISK

Medium Risk

Why sketch_ellipse needs a policy

This tool creates a new geometric element (an ellipse) within an active SolidWorks sketch. It modifies the CAD document by adding sketch geometry, which is a reversible write operation (the ellipse can be deleted). No code execution, financial transactions, or irreversible destruction is involved.

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

Documented attack patterns abuse exactly the kind of access sketch_ellipse gives an agent:

POLICY

How to control sketch_ellipse

PolicyLayer is an MCP gateway — it sits between your AI agents and SolidWorks MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for sketch_ellipse:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sketch_ellipse": {
      "limits": [
        {
          "counter": "sketch_ellipse_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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.

Create a free account and register SolidWorks MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More SolidWorks MCP Server tools

Destructive extrude_cut Create a cut extrusion to remove material from an existing solid body. The sketch must be Execute batch_run_macros Run multiple macros in sequence Execute macro_start_recording Start recording a new macro Execute macro_stop_recording Stop the current macro recording Execute run_macro Run a SolidWorks macro file Execute run_vba_macro Execute a VBA macro in SolidWorks Execute sketch_arc Draw an arc in the active sketch. AUTOMATIC: This tool automatically ensures an active sk Execute start_native_macro_recording Start recording a macro using SolidWorks native VBA recorder

All 84 SolidWorks MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

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 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 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 MCP Server. 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 MCP server (jianzhichun/solidworks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every SolidWorks MCP Server tool call.

Start from SolidWorks MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →