unassign_primary_ip · Hcloud MCP: Risk & Policy

WHAT IT DOES

What unassign_primary_ip does on Hcloud

AI agents use unassign_primary_ip 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 unassign_primary_ip needs a policy

This tool changes infrastructure state by removing a primary IP assignment from a server. While the operation is reversible (a primary IP can be reassigned), it modifies critical network configuration. The requirement that the server must be powered off indicates this is a significant infrastructure change.

From the tool's definition Unassign a Primary IP from its server—this modifies network configuration by removing a primary IP assignment, a reversible operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unassign_primary_ip Rate-limited

unassign_primary_ip 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": {
    "unassign_primary_ip": {
      "limits": [
        {
          "counter": "unassign_primary_ip_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 unassign_primary_ip

What does the unassign_primary_ip tool do? +

Unassign a Primary IP from its server (server must be powered off). 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 unassign_primary_ip? +

Register the Hcloud MCP server in PolicyLayer and add a rule for unassign_primary_ip: 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 unassign_primary_ip? +

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

Can I rate-limit unassign_primary_ip? +

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

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

unassign_primary_ip 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.