hetzner_power_on_server · Hetzner MCP Server MCP

WHAT IT DOES

What hetzner_power_on_server does on Hetzner MCP Server

AI agents invoke hetzner_power_on_server to trigger actions in Hetzner 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 hetzner_power_on_server needs a policy

Powering on a server triggers an external operation (starting a cloud VM) that has real-world side effects such as incurring compute costs and launching running processes. It does not read, write, or delete data, nor is it directly financial or destructive — it falls squarely in Execute. Misuse could cause unintended servers to start running and accumulate charges, hence medium severity.

From the tool's definition Power on a server that is currently off

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

hetzner_power_on_server Rate-limited

hetzner_power_on_server 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": {
    "hetzner_power_on_server": {
      "limits": [
        {
          "counter": "hetzner_power_on_server_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 Hetzner MCP Server, so you can run agents against it safely.

FAQ

Questions about hetzner_power_on_server

What does the hetzner_power_on_server tool do? +

Power on a server that is currently off. It is categorised as a Execute tool in the Hetzner 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 hetzner_power_on_server? +

Register the Hetzner MCP Server MCP server in PolicyLayer and add a rule for hetzner_power_on_server: 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 Hetzner MCP Server. Nothing to install.

What risk level is hetzner_power_on_server? +

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

Can I rate-limit hetzner_power_on_server? +

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

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

hetzner_power_on_server is provided by the Hetzner MCP Server MCP server (jurislm/hetzner-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.