draw_arc · AutoCAD MCP Server MCP: Risk & Policy

WHAT IT DOES

What draw_arc does on AutoCAD MCP Server

AI agents use draw_arc 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_arc needs a policy

This tool creates a new geometric shape (arc) in a CAD document. It is a reversible write operation — the arc can be deleted or undone. No code execution, file deletion, financial transaction, or irreversible destruction is involved.

From the tool's definition Draw an arc with specified center, radius, and angles in AutoCAD

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

draw_arc Rate-limited

draw_arc 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_arc": {
      "limits": [
        {
          "counter": "draw_arc_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 AutoCAD MCP Server, so you can run agents against it safely.

FAQ

Questions about draw_arc

What does the draw_arc tool do? +

Draw an arc with specified center, radius, and angles 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_arc? +

Register the AutoCAD MCP Server MCP server in PolicyLayer and add a rule for draw_arc: 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_arc? +

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

Can I rate-limit draw_arc? +

Yes. Add a rate_limit block to the draw_arc 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_arc completely? +

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

draw_arc 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.