link_nodes · Draw Io MCP Server MCP: Risk & Policy

WHAT IT DOES

What link_nodes does on Draw Io MCP Server

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

WHY IT NEEDS A POLICY

Why link_nodes needs a policy

This tool creates connections (edges) between existing nodes in a diagram, which is a data modification operation. The effect is reversible (connections can be removed via remove_nodes or edit_nodes), and there is no data destruction, code execution, or financial impact. The modification is scoped to diagram metadata only, making it a low-severity write operation suitable for diagram editing workflows.

From the tool's definition Tool description states 'Create one or more connections between nodes in a diagram file' — the verb 'Create' indicates a write operation that modifies diagram structure reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

link_nodes Rate-limited

link_nodes 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": {
    "link_nodes": {
      "limits": [
        {
          "counter": "link_nodes_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 Draw Io MCP Server, so you can run agents against it safely.

FAQ

Questions about link_nodes

What does the link_nodes tool do? +

Create one or more connections between nodes in a diagram file. It is categorised as a Write tool in the Draw Io 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 link_nodes? +

Register the Draw Io MCP Server MCP server in PolicyLayer and add a rule for link_nodes: 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 Draw Io MCP Server. Nothing to install.

What risk level is link_nodes? +

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

Can I rate-limit link_nodes? +

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

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

link_nodes is provided by the Draw Io MCP Server MCP server (noacodenoobe/drawiomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.