list_by_type

THE RISK

Low Risk

Why list_by_type needs a policy

This tool performs a read-only listing operation that retrieves information about storage gateways filtered by type. There is no data modification, deletion, code execution, or financial impact. It is a straightforward data retrieval operation consistent with the 'Read' category.

From the tool's definition Tool name 'list_by_type' and description 'List storage gateways by type' indicate a query/retrieval operation with no modification or side effects.

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

POLICY

How to control list_by_type

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_by_type:

policy.json

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

list_by_type 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 →

Free to start. No card required.

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_by_type

What does the list_by_type tool do? +

List storage gateways by type. 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_by_type? +

Register the Vultr MCP server in PolicyLayer and add a rule for list_by_type: 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_by_type? +

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

Can I rate-limit list_by_type? +

Yes. Add a rate_limit block to the list_by_type 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_by_type completely? +

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

list_by_type 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 →