AI agents use update_firewall_settings 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 firewall configuration settings, which is a reversible write operation. However, the blast radius is high because incorrect firewall rules could expose or block critical infrastructure, deny legitimate traffic, or inadvertently allow malicious access. It is not Destructive (settings can be reverted), not Execute (does not run arbitrary code), and not Financial. Write is most appropriate.
From the tool's definition Tool name is 'update_firewall_settings' and description states 'Update default firewalls settings'. The 'update' verb indicates modification of existing configuration rather than deletion or execution of arbitrary commands.
Documented attack patterns abuse exactly the kind of access update_firewall_settings 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_firewall_settings:
{
"version": "1",
"default": "deny",
"tools": {
"update_firewall_settings": {
"limits": [
{
"counter": "update_firewall_settings_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_firewall_settings 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.
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Update default firewalls settings. 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_firewall_settings: 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_firewall_settings 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_firewall_settings 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_firewall_settings. 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_firewall_settings 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.