add_node · Claude-Modeling-Labs MCP Server MCP

WHAT IT DOES

What add_node does on Claude-Modeling-Labs MCP Server

AI agents use add_node 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 add_node needs a policy

The tool adds a node to a Cisco Modeling Labs environment, which is a reversible write operation that modifies the lab topology. While the empty description lowers confidence slightly, the naming pattern and sibling tools (create_router, create_lab) establish this as a Write operation.

From the tool's definition Tool name 'add_node' suggests creating/adding a network node. Server context shows tools like 'create_lab', 'create_router', 'create_link_v3' that modify lab topologies.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_node Rate-limited

add_node 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": {
    "add_node": {
      "limits": [
        {
          "counter": "add_node_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 add_node

What does the add_node tool do? +

add_node. 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 add_node? +

Register the Claude-Modeling-Labs MCP Server MCP server in PolicyLayer and add a rule for add_node: 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 add_node? +

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

Can I rate-limit add_node? +

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

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

add_node 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.