add_ip_whitelist_entry

THE RISK

Medium Risk

Why add_ip_whitelist_entry needs a policy

Adding an IP whitelist entry creates or modifies access control rules, which is a Write operation (reversible change to configuration). Severity is medium because misconfiguration could grant unintended network access to cloud infrastructure, but it doesn't delete data, execute arbitrary code, or move money.

From the tool's definition Tool name 'add_ip_whitelist_entry' indicates creation/modification of whitelist rules. No description provided, but the verb 'add' and 'whitelist_entry' context suggest reversible data modification.

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

POLICY

How to control add_ip_whitelist_entry

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 add_ip_whitelist_entry:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_ip_whitelist_entry": {
      "limits": [
        {
          "counter": "add_ip_whitelist_entry_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

add_ip_whitelist_entry 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.

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.

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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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about add_ip_whitelist_entry

What does the add_ip_whitelist_entry tool do? +

add_ip_whitelist_entry. It is categorised as a Write tool in the Vultr MCP 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_ip_whitelist_entry? +

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

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

Can I rate-limit add_ip_whitelist_entry? +

Yes. Add a rate_limit block to the add_ip_whitelist_entry 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_ip_whitelist_entry completely? +

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

add_ip_whitelist_entry 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 →