list_capacity

THE RISK

Low Risk

Why list_capacity needs a policy

This tool retrieves and displays capacity metrics and system information from CloudStack. It performs no modifications, deletions, or execution of external operations. Even in a CloudStack environment where infrastructure changes are possible through sibling tools, this tool only queries existing capacity data, making it a straightforward Read operation with minimal risk.

From the tool's definition Tool name 'list_capacity' combined with description 'List system capacity information' indicates a query/retrieval operation with no side effects. The verb 'list' is explicitly a Read operation.

Documented attack patterns abuse exactly the kind of access list_capacity gives an agent:

POLICY

How to control list_capacity

PolicyLayer is an MCP gateway — it sits between your AI agents and CloudStack MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_capacity:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_capacity": {}
  }
}

list_capacity is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register CloudStack MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 45 CloudStack MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_capacity

What does the list_capacity tool do? +

List system capacity information. It is categorised as a Read tool in the CloudStack MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_capacity? +

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

list_capacity is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_capacity? +

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

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

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

Enforce policy on every CloudStack MCP Server tool call.

Start from CloudStack MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →