start_vpn · VPN As A Service MCP: Risk & Policy

WHAT IT DOES

What start_vpn does on VPN As A Service MCP

AI agents invoke start_vpn to trigger actions in VPN As A Service MCP. 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 start_vpn needs a policy

This tool executes a command that activates VPN infrastructure and modifies network behavior. It is not a read operation (no data retrieval), not write in the reversible sense (it's closer to state change), and not destructive (the effect is reversible via stop_vpn). However, it runs an operation whose effects depend on the VPN configuration and infrastructure state, making it Execute-category.

From the tool's definition Tool 'start_vpn' initiates a VPN tunnel by performing an action that triggers external network operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start_vpn Rate-limited

start_vpn 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": {
    "start_vpn": {
      "limits": [
        {
          "counter": "start_vpn_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 VPN As A Service MCP, so you can run agents against it safely.

FAQ

Questions about start_vpn

What does the start_vpn tool do? +

Start the VPN tunnel. It is categorised as a Execute tool in the VPN As A Service MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_vpn? +

Register the VPN As A Service MCP server in PolicyLayer and add a rule for start_vpn: 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 VPN As A Service MCP. Nothing to install.

What risk level is start_vpn? +

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

Can I rate-limit start_vpn? +

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

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

start_vpn is provided by the VPN As A Service MCP server (nolaan/ai_vpn_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.