reboot_server · Hcloud MCP: Risk & Policy

WHAT IT DOES

What reboot_server does on Hcloud

AI agents invoke reboot_server to trigger actions in Hcloud. 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 reboot_server needs a policy

Rebooting a server is an external operation that interrupts running services and processes. While it is recoverable (soft reboot), it can cause downtime and disrupt workloads, making it an Execute-category action with high severity due to the blast radius of taking a production server offline.

From the tool's definition 'Reboot a server (soft)' — triggers an external operation (soft reboot) on a cloud server

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reboot_server Rate-limited

reboot_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": {
    "reboot_server": {
      "limits": [
        {
          "counter": "reboot_server_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Hcloud, so you can run agents against it safely.

FAQ

Questions about reboot_server

What does the reboot_server tool do? +

Reboot a server (soft). It is categorised as a Execute tool in the Hcloud MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on reboot_server? +

Register the Hcloud MCP server in PolicyLayer and add a rule for reboot_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 Hcloud. Nothing to install.

What risk level is reboot_server? +

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

Can I rate-limit reboot_server? +

Yes. Add a rate_limit block to the reboot_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 reboot_server completely? +

Set action: deny in the PolicyLayer policy for reboot_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 reboot_server? +

reboot_server is provided by the Hcloud MCP server (xodus-co/hcloud-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.