remove_firewall_from_resources · Hcloud MCP: Risk & Policy

WHAT IT DOES

What remove_firewall_from_resources does on Hcloud

AI agents use remove_firewall_from_resources 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 remove_firewall_from_resources needs a policy

Removing a firewall from servers is a reversible write operation (the firewall can be re-applied), but it carries high severity because it exposes servers to network traffic that was previously blocked, potentially opening security vulnerabilities. It modifies security posture but does not irreversibly delete any data or resource.

From the tool's definition remove_firewall_from_resources — removes a firewall from servers, reversing a security configuration

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

remove_firewall_from_resources Rate-limited

remove_firewall_from_resources 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": {
    "remove_firewall_from_resources": {
      "limits": [
        {
          "counter": "remove_firewall_from_resources_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 remove_firewall_from_resources

What does the remove_firewall_from_resources tool do? +

Remove a firewall from servers. Pass remove_from: [{ type:. 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 remove_firewall_from_resources? +

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

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

Can I rate-limit remove_firewall_from_resources? +

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

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

remove_firewall_from_resources 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.