set_protocol · Mullvad MCP: Risk & Policy

WHAT IT DOES

What set_protocol does on Mullvad

AI agents use set_protocol to create or update resources in Mullvad — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mullvad environment.

WHY IT NEEDS A POLICY

Why set_protocol needs a policy

This tool creates or modifies VPN protocol settings (likely changing between WireGuard, OpenVPN, etc.), which is a Write action—reversible and not destructive. The empty description lowers confidence slightly, but the name and context of peer tools clearly indicate a configuration modification.

From the tool's definition Tool name 'set_protocol' indicates modification of VPN protocol settings. Sibling tools like 'connect', 'disconnect', and 'get_settings' show this server manages VPN configuration state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_protocol Rate-limited

set_protocol 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": {
    "set_protocol": {
      "limits": [
        {
          "counter": "set_protocol_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 Mullvad, so you can run agents against it safely.

FAQ

Questions about set_protocol

What does the set_protocol tool do? +

set_protocol. It is categorised as a Write tool in the Mullvad MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_protocol? +

Register the Mullvad MCP server in PolicyLayer and add a rule for set_protocol: 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 Mullvad. Nothing to install.

What risk level is set_protocol? +

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

Can I rate-limit set_protocol? +

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

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

set_protocol is provided by the Mullvad MCP server (oresam-xyz/mullvad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.