group_elements · Excalidraw MCP Server MCP: Risk & Policy

WHAT IT DOES

What group_elements does on Excalidraw MCP Server

AI agents use group_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 group_elements needs a policy

Grouping elements is a Write operation because it modifies the state of the Excalidraw canvas by changing element organization/relationships, but the operation is fully reversible (elements can be ungrouped). It does not delete data (Destructive), execute external code (Execute), or involve financial transactions (Financial).

From the tool's definition Tool description states 'Group multiple elements together' which modifies the canvas by organizing elements into a group structure. This is a reversible modification operation typical of diagram editors.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

group_elements Rate-limited

group_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": {
    "group_elements": {
      "limits": [
        {
          "counter": "group_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 group_elements

What does the group_elements tool do? +

Group multiple elements together. 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 group_elements? +

Register the Excalidraw MCP Server MCP server in PolicyLayer and add a rule for group_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 group_elements? +

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

Can I rate-limit group_elements? +

Yes. Add a rate_limit block to the group_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 group_elements completely? +

Set action: deny in the PolicyLayer policy for group_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 group_elements? +

group_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.