list_cluster_tiers

THE RISK

Low Risk

Why list_cluster_tiers needs a policy

This tool retrieves and queries available tier information for Object Storage clusters. It performs a read-only operation that retrieves data without modifying, deleting, or executing any infrastructure changes. The blast radius of misuse is minimal—an agent could only waste time or enumerate cluster configurations, posing no risk to data integrity or system state.

From the tool's definition Tool name 'list_cluster_tiers' and description 'List all available tiers for a specific Object Storage cluster' indicate a retrieval operation with no side effects.

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

POLICY

How to control list_cluster_tiers

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

policy.json

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

list_cluster_tiers 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 Vultr MCP — 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 →

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EXPLORE

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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_cluster_tiers

What does the list_cluster_tiers tool do? +

List all available tiers for a specific Object Storage cluster. It is categorised as a Read tool in the Vultr MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_cluster_tiers? +

Register the Vultr MCP server in PolicyLayer and add a rule for list_cluster_tiers: 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 Vultr MCP. Nothing to install.

What risk level is list_cluster_tiers? +

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

Can I rate-limit list_cluster_tiers? +

Yes. Add a rate_limit block to the list_cluster_tiers 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_cluster_tiers completely? +

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

list_cluster_tiers is provided by the Vultr MCP server (rsp2k/mcp-vultr). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Vultr MCP tool call.

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

CHECK YOUR STACK →