list_nodebalancer_firewalls

THE RISK

Low Risk

Why list_nodebalancer_firewalls needs a policy

This tool queries and returns information about existing firewall configurations attached to a NodeBalancer. It performs read-only data retrieval with no capability to modify, create, delete, or execute operations. The blast radius of misuse is minimal—an agent could only enumerate firewall configurations, which does not compromise infrastructure integrity.

From the tool's definition Tool name 'list_nodebalancer_firewalls' and description 'List firewalls assigned to a NodeBalancer' indicate a retrieval operation with no modification or side effects.

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

POLICY

How to control list_nodebalancer_firewalls

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

policy.json

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

list_nodebalancer_firewalls 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 Linode 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

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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_nodebalancer_firewalls

What does the list_nodebalancer_firewalls tool do? +

List firewalls assigned to a NodeBalancer. It is categorised as a Read tool in the Linode MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_nodebalancer_firewalls? +

Register the Linode MCP Server MCP server in PolicyLayer and add a rule for list_nodebalancer_firewalls: 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 Linode MCP Server. Nothing to install.

What risk level is list_nodebalancer_firewalls? +

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

Can I rate-limit list_nodebalancer_firewalls? +

Yes. Add a rate_limit block to the list_nodebalancer_firewalls 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_nodebalancer_firewalls completely? +

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

list_nodebalancer_firewalls is provided by the Linode MCP Server MCP server (takashito/linode-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 Linode MCP Server tool call.

Start from Linode 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 →