add_load_balancer_service · Hcloud MCP: Risk & Policy

WHAT IT DOES

What add_load_balancer_service does on Hcloud

AI agents use add_load_balancer_service 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 add_load_balancer_service needs a policy

This tool adds a service to an existing load balancer, which is a reversible modification operation. It creates new configuration state but does not delete, execute arbitrary code, or move financial resources. The blast radius is moderate: misconfiguration could route traffic incorrectly or disrupt service availability, but the operation itself is not destructive and can be reversed by removing the service.

From the tool's definition Tool name 'add_load_balancer_service' and description 'Add a service to a load balancer' indicate the action creates or modifies a load balancer configuration by adding a new service resource.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_load_balancer_service Rate-limited

add_load_balancer_service 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": {
    "add_load_balancer_service": {
      "limits": [
        {
          "counter": "add_load_balancer_service_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 add_load_balancer_service

What does the add_load_balancer_service tool do? +

Add a service to a load balancer. 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 add_load_balancer_service? +

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

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

Can I rate-limit add_load_balancer_service? +

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

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

add_load_balancer_service 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.