save_drawing · CAD- MCP: Risk & Policy

WHAT IT DOES

What save_drawing does on CAD-MCP

AI agents use save_drawing 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 save_drawing needs a policy

This tool creates or modifies files on disk by persisting CAD drawings to DWG format. It is Write rather than Destructive because: (1) saving typically overwrites only if explicitly directed to an existing file, and (2) the operation is reversible (files can be deleted or replaced).

From the tool's definition Tool name 'save_drawing' with description indicating it saves/persists drawings to file system (with optional file_path parameter). Description translates to 'Save drawing. Parameters: file_path? (can be empty, use default output path)'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_drawing Rate-limited

save_drawing 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": {
    "save_drawing": {
      "limits": [
        {
          "counter": "save_drawing_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 save_drawing

What does the save_drawing tool do? +

保存图纸。参数: file_path?（可为空，使用默认输出路径）. 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 save_drawing? +

Register the CAD- MCP server in PolicyLayer and add a rule for save_drawing: 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 save_drawing? +

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

Can I rate-limit save_drawing? +

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

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

save_drawing 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.