add_host · CloudStack MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_host does on CloudStack MCP Server

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

WHY IT NEEDS A POLICY

Why add_host needs a policy

This tool creates a new hypervisor host resource and adds it to an existing cluster, which is a reversible Write operation. While infrastructure changes can have significant blast radius (high severity), the operation itself is not destructive (reversible), does not involve financial transactions, and does not execute arbitrary code.

From the tool's definition Tool name 'add_host' and description 'Add hypervisor host to cluster' indicate creation of infrastructure resource (hypervisor host) in a cluster, which modifies the system state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_host Rate-limited

add_host 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_host": {
      "limits": [
        {
          "counter": "add_host_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 CloudStack MCP Server, so you can run agents against it safely.

FAQ

Questions about add_host

What does the add_host tool do? +

Add hypervisor host to cluster. It is categorised as a Write tool in the CloudStack 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 add_host? +

Register the CloudStack MCP Server MCP server in PolicyLayer and add a rule for add_host: 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 CloudStack MCP Server. Nothing to install.

What risk level is add_host? +

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

Can I rate-limit add_host? +

Yes. Add a rate_limit block to the add_host 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_host completely? +

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

add_host is provided by the CloudStack MCP Server MCP server (mozg31337/cloudstack-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.