Update the firewalls assigned to a NodeBalancer
AI agents use update_nodebalancer_firewalls to create or update resources in Linode MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Linode MCP Server environment.
This tool modifies (updates) the firewall configuration of a NodeBalancer, a critical networking component. While not destructive (changes are reversible) and not immediately financial, misconfiguration could expose infrastructure to unauthorized access or block legitimate traffic, making it a high-severity Write operation.
From the tool's definition update_nodebalancer_firewalls: 'Update the firewalls assigned to a NodeBalancer' — modifies firewall rules applied to a load balancing resource.
Documented attack patterns abuse exactly the kind of access update_nodebalancer_firewalls gives an agent:
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 update_nodebalancer_firewalls:
{
"version": "1",
"default": "deny",
"tools": {
"update_nodebalancer_firewalls": {
"limits": [
{
"counter": "update_nodebalancer_firewalls_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_nodebalancer_firewalls 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.
Free to start. No card required.
Update the firewalls assigned to a NodeBalancer. It is categorised as a Write tool in the Linode MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Linode MCP Server MCP server in PolicyLayer and add a rule for update_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.
update_nodebalancer_firewalls is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the update_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.
Set action: deny in the PolicyLayer policy for update_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.
update_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.
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.
Free to start. No card required.
416 Linode MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.