layer_modify

Modify an existing layer's color, linetype, and/or lineweight.

SERVERAutoCAD MCP Pro SOURCEu-c4n/autocad-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/u-c4n-autocad-mcp/layer-modify.md

WHAT IT DOES

What layer_modify does on AutoCAD MCP Pro

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

RISK

Why layer_modify is rated Medium

This tool modifies layer properties reversibly without deleting data or executing arbitrary code. Layer modifications can affect the visual appearance and behavior of drawings and could impact dependent designs if changed carelessly, but changes are undoable (typical CAD undo/redo support). The blast radius is bounded to layer properties rather than the content/entities themselves.

From the tool's definition Tool name 'layer_modify' and description states it modifies an existing layer's properties (color, linetype, lineweight). The verb 'modify' indicates change to existing data structures within the CAD drawing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs layer_modify safely

PolicyLayer is an MCP gateway: it sits between your AI agents and AutoCAD MCP Pro, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For layer_modify, this is the rule to start with:

layer_modify Rate-limited

layer_modify 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": {
    "layer_modify": {
      "limits": [
        {
          "counter": "layer_modify_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AutoCAD MCP Pro, apply this rule, and every layer_modify call is checked against it from then on.

FAQ

Questions about layer_modify

What does the layer_modify tool do? +

Modify an existing layer's color, linetype, and/or lineweight. It is categorised as a Write tool in the AutoCAD MCP Pro MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on layer_modify? +

Register the AutoCAD MCP Pro MCP server in PolicyLayer and add a rule for layer_modify: 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 Pro. Nothing to install.

What risk level is layer_modify? +

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

Can I rate-limit layer_modify? +

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

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

layer_modify is provided by the AutoCAD MCP Pro MCP server (u-c4n/autocad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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