stop_lab · Claude-Modeling-Labs MCP Server MCP

WHAT IT DOES

What stop_lab does on Claude-Modeling-Labs MCP Server

AI agents invoke stop_lab to trigger actions in Claude-Modeling-Labs MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why stop_lab needs a policy

This tool triggers an external operation (stopping a lab environment) whose effects depend on which lab is targeted as an argument. While not destructive in the sense of permanent data deletion, it represents an Execute action because it changes the state of running infrastructure and could disrupt ongoing network simulations or testing.

From the tool's definition Tool name 'stop_lab' with description 'Stop the specified lab' indicates execution of a lab-stopping operation on a Cisco Modeling Labs environment.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_lab Rate-limited

stop_lab stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "stop_lab": {
      "limits": [
        {
          "counter": "stop_lab_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 stop_lab

What does the stop_lab tool do? +

Stop the specified lab. It is categorised as a Execute tool in the Claude-Modeling-Labs MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on stop_lab? +

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

stop_lab is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit stop_lab? +

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

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

stop_lab 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.