create_server · Hcloud MCP: Risk & Policy

WHAT IT DOES

What create_server does on Hcloud

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

WHY IT NEEDS A POLICY

Why create_server needs a policy

Creating a server is a Write operation because it generates new infrastructure resources that can subsequently be modified or deleted. It is not Destructive (irreversible deletion), not Execute (arbitrary code execution with unpredictable effects), and not Financial (no direct money movement).

From the tool's definition Tool creates a new server in Hetzner Cloud infrastructure with the description 'Create a new server'. This is a reversible write operation that modifies cloud infrastructure state by provisioning new resources.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_server Rate-limited

create_server 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": {
    "create_server": {
      "limits": [
        {
          "counter": "create_server_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 Hcloud, so you can run agents against it safely.

FAQ

Questions about create_server

What does the create_server tool do? +

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

How do I enforce a policy on create_server? +

Register the Hcloud MCP server in PolicyLayer and add a rule for create_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 create_server? +

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

Can I rate-limit create_server? +

Yes. Add a rate_limit block to the create_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 create_server completely? +

Set action: deny in the PolicyLayer policy for create_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 create_server? +

create_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.