create_layer · CAD- MCP: Risk & Policy

WHAT IT DOES

What create_layer does on CAD-MCP

AI agents use create_layer 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 create_layer needs a policy

Layer creation is a reversible write operation that modifies the CAD document structure. It persists data (new layer definition) but remains undoable in most CAD applications. This is less severe than Destructive (layers can be deleted) and does not execute arbitrary commands or delete data.

From the tool's definition Tool creates a new layer in CAD software (layer_name parameter); layer creation is a persistent structural modification to the drawing model that affects how subsequent objects are organized and rendered.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_layer Rate-limited

create_layer 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": {
    "create_layer": {
      "limits": [
        {
          "counter": "create_layer_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 create_layer

What does the create_layer tool do? +

创建图层。参数: layer_name, color?. 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 create_layer? +

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

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

Can I rate-limit create_layer? +

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

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

create_layer 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.