prepare_host_for_maintenance · CloudStack MCP Server MCP

WHAT IT DOES

What prepare_host_for_maintenance does on CloudStack MCP Server

AI agents invoke prepare_host_for_maintenance to trigger actions in CloudStack MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why prepare_host_for_maintenance needs a policy

Putting a host into maintenance mode is an operational action that causes all running VMs on that host to be migrated or stopped, affecting production workloads. This is not a simple read or write, but an execution of a significant infrastructure operation. While potentially reversible (maintenance mode can be exited), the immediate impact on running workloads is substantial, making it high severity.

From the tool's definition 'Put host in maintenance mode' - triggers an operational state change on a host that affects all VMs running on it

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

prepare_host_for_maintenance Rate-limited

prepare_host_for_maintenance stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "prepare_host_for_maintenance": {
      "limits": [
        {
          "counter": "prepare_host_for_maintenance_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 prepare_host_for_maintenance

What does the prepare_host_for_maintenance tool do? +

Put host in maintenance mode. It is categorised as a Execute tool in the CloudStack MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on prepare_host_for_maintenance? +

Register the CloudStack MCP Server MCP server in PolicyLayer and add a rule for prepare_host_for_maintenance: 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 prepare_host_for_maintenance? +

prepare_host_for_maintenance is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit prepare_host_for_maintenance? +

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

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

prepare_host_for_maintenance 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.