unlock_elements · Excalidraw MCP Server MCP: Risk & Policy

WHAT IT DOES

What unlock_elements does on Excalidraw MCP Server

AI agents use unlock_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 unlock_elements needs a policy

Unlocking elements allows modification of existing diagram content. While the unlock itself is reversible (elements can be re-locked), it enables Write operations on what were previously protected elements. The severity is medium because misuse could result in unintended modifications to collaborative diagrams, but changes are not destructive or financial, and can be undone.

From the tool's definition Tool name is 'unlock_elements' with description 'Unlock elements to allow modification'. The operation enables subsequent modification of diagram elements by changing their lock state, which is a reversible state change.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unlock_elements Rate-limited

unlock_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": {
    "unlock_elements": {
      "limits": [
        {
          "counter": "unlock_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 unlock_elements

What does the unlock_elements tool do? +

Unlock elements to allow modification. 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 unlock_elements? +

Register the Excalidraw MCP Server MCP server in PolicyLayer and add a rule for unlock_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 unlock_elements? +

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

Can I rate-limit unlock_elements? +

Yes. Add a rate_limit block to the unlock_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 unlock_elements completely? +

Set action: deny in the PolicyLayer policy for unlock_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 unlock_elements? +

unlock_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.