draw_rectangle · CAD- MCP: Risk & Policy

WHAT IT DOES

What draw_rectangle does on CAD-MCP

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

WHY IT NEEDS A POLICY

Why draw_rectangle needs a policy

Drawing rectangles creates or modifies CAD designs reversibly—the shapes can be undone/deleted later. This is a Write operation rather than Execute because it performs a specific, predictable drawing action rather than executing arbitrary commands or code. While the sibling tool 'process_command' might be Execute, this tool has a defined, limited purpose.

From the tool's definition Tool draws rectangles in CAD software by creating new geometric objects. The parameters (corner1, corner2, layer, color, lineweight) specify shape properties to be created.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

draw_rectangle Rate-limited

draw_rectangle 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_rectangle": {
      "limits": [
        {
          "counter": "draw_rectangle_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 CAD-MCP, so you can run agents against it safely.

FAQ

Questions about draw_rectangle

What does the draw_rectangle tool do? +

绘制矩形。参数: corner1, corner2, layer?, color?, lineweight?. It is categorised as a Write tool in the CAD-MCP 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_rectangle? +

Register the CAD- MCP server in PolicyLayer and add a rule for draw_rectangle: 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 CAD-MCP. Nothing to install.

What risk level is draw_rectangle? +

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

Can I rate-limit draw_rectangle? +

Yes. Add a rate_limit block to the draw_rectangle 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_rectangle completely? +

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

draw_rectangle is provided by the CAD- MCP server (piexl/cad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.