duplicate_elements · Excalidraw MCP Server MCP

WHAT IT DOES

What duplicate_elements does on Excalidraw MCP Server

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

WHY IT NEEDS A POLICY

Why duplicate_elements needs a policy

Duplicating elements creates new data on the canvas but does not destroy or modify existing elements irreversibly. It is a write operation that changes the diagram state in a reversible manner. The severity is low because duplicating diagram elements has minimal blast radius; the operation affects only the visual diagram and can be easily undone.

From the tool's definition Tool name 'duplicate_elements' and description 'Duplicate elements with a configurable offset' indicate creation of new diagram elements. This is a reversible modification operation—duplicated elements can be deleted.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

duplicate_elements Rate-limited

duplicate_elements 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": {
    "duplicate_elements": {
      "limits": [
        {
          "counter": "duplicate_elements_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 Excalidraw MCP Server, so you can run agents against it safely.

FAQ

Questions about duplicate_elements

What does the duplicate_elements tool do? +

Duplicate elements with a configurable offset. It is categorised as a Write tool in the Excalidraw 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 duplicate_elements? +

Register the Excalidraw MCP Server MCP server in PolicyLayer and add a rule for duplicate_elements: 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 Excalidraw MCP Server. Nothing to install.

What risk level is duplicate_elements? +

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

Can I rate-limit duplicate_elements? +

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

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

duplicate_elements is provided by the Excalidraw MCP Server MCP server (kakacoding1/mcp_excalidraw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.