hetzner_attach_volume · Hetzner MCP Server MCP

WHAT IT DOES

What hetzner_attach_volume does on Hetzner MCP Server

AI agents use hetzner_attach_volume 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_attach_volume needs a policy

Attaching a volume to a server modifies the server's configuration and storage configuration reversibly. While this changes infrastructure state, it is not destructive (can be detached), not financial, and not code execution. It fits the Write category as a configuration modification.

From the tool's definition Tool description states 'Attach a Cloud Volume to a server' — this is a modification operation that creates a persistent attachment between resources.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

hetzner_attach_volume Rate-limited

hetzner_attach_volume 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_attach_volume": {
      "limits": [
        {
          "counter": "hetzner_attach_volume_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_attach_volume

What does the hetzner_attach_volume tool do? +

Attach a Cloud Volume to a server. The server must be in the same location as the volume. The volume must be in \. 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_attach_volume? +

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

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

Can I rate-limit hetzner_attach_volume? +

Yes. Add a rate_limit block to the hetzner_attach_volume 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_attach_volume completely? +

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

hetzner_attach_volume 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.