link_vpn_account · VPN As A Service MCP: Risk & Policy

WHAT IT DOES

What link_vpn_account does on VPN As A Service MCP

AI agents use link_vpn_account to create or update resources in VPN As A Service MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your VPN As A Service MCP environment.

WHY IT NEEDS A POLICY

Why link_vpn_account needs a policy

This tool associates/binds an existing account to the VPN service using a token — a reversible write operation (account linking can be unlinked). It modifies account state but does not delete data, execute code, or involve financial transactions. Misuse could allow unauthorized account association, giving it medium severity.

From the tool's definition "Link an existing account with the provided token"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

link_vpn_account Rate-limited

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

FAQ

Questions about link_vpn_account

What does the link_vpn_account tool do? +

Link an existing account with the provided token. It is categorised as a Write tool in the VPN As A Service MCP 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_vpn_account? +

Register the VPN As A Service MCP server in PolicyLayer and add a rule for link_vpn_account: 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 link_vpn_account? +

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

Can I rate-limit link_vpn_account? +

Yes. Add a rate_limit block to the link_vpn_account 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_vpn_account completely? +

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

link_vpn_account 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.