link_nodes · Claude-Modeling-Labs MCP Server MCP

WHAT IT DOES

What link_nodes does on Claude-Modeling-Labs MCP Server

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

WHY IT NEEDS A POLICY

Why link_nodes needs a policy

This tool creates new data structures (network links) within the lab environment, fitting the Write category. It is reversible (links can be removed) and does not execute arbitrary code, delete data, or move financial resources. Severity is medium because while creating incorrect network links could disrupt lab functionality or cause misconfiguration, the effects are confined to the lab environment and reversible.

From the tool's definition Tool description states "Create a link between two nodes" which involves creating a new network topology connection in the Cisco Modeling Labs environment. This is a create operation that modifies the lab configuration 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 Claude-Modeling-Labs MCP Server, so you can run agents against it safely.

FAQ

Questions about link_nodes

What does the link_nodes tool do? +

Create a link between two nodes by automatically selecting appropriate interfaces. It is categorised as a Write tool in the Claude-Modeling-Labs 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 Claude-Modeling-Labs 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 Claude-Modeling-Labs 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 Claude-Modeling-Labs MCP Server MCP server (mediocretriumph/claude-cml-toolkit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.