hetzner_create_ssh_key · Hetzner MCP Server MCP

WHAT IT DOES

What hetzner_create_ssh_key does on Hetzner MCP Server

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

WHY IT NEEDS A POLICY

Why hetzner_create_ssh_key needs a policy

This tool creates a new SSH key resource in the Hetzner Cloud project. While SSH keys themselves are not sensitive data (public keys are meant to be shared), adding an SSH key enables future server access and modifies the security posture of the project. It is reversible (can be deleted), so it does not qualify as Destructive. It does not execute arbitrary code or trigger server operations, so it is not Execute.

From the tool's definition The tool description states 'Add a new SSH public key to the project', which is a create operation that modifies project state by adding a new resource.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

hetzner_create_ssh_key Rate-limited

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

FAQ

Questions about hetzner_create_ssh_key

What does the hetzner_create_ssh_key tool do? +

Add a new SSH public key to the project. The SSH key can then be used when creating servers to enable SSH access. Args: - name: A name for the SSH key (e.g.,. It is categorised as a Write tool in the Hetzner MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on hetzner_create_ssh_key? +

Register the Hetzner MCP Server MCP server in PolicyLayer and add a rule for hetzner_create_ssh_key: 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_create_ssh_key? +

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

Can I rate-limit hetzner_create_ssh_key? +

Yes. Add a rate_limit block to the hetzner_create_ssh_key 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_create_ssh_key completely? +

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

hetzner_create_ssh_key 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.