AI agents use create_firewall_rule to create or update resources in CloudStack MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CloudStack MCP Server environment.
Creating firewall rules modifies cloud infrastructure security policies in a reversible manner (rules can be updated or deleted later). This is a Write operation rather than Execute because it configures policy rather than running arbitrary code. While security-relevant, it does not directly delete data (Destructive), execute arbitrary operations (Execute), or move money (Financial).
From the tool's definition Tool name is 'create_firewall_rule' with description 'Create a firewall rule'. The verb 'create' indicates data modification.
Documented attack patterns abuse exactly the kind of access create_firewall_rule gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CloudStack MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_firewall_rule:
{
"version": "1",
"default": "deny",
"tools": {
"create_firewall_rule": {
"limits": [
{
"counter": "create_firewall_rule_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_firewall_rule 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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Create a firewall rule. It is categorised as a Write tool in the CloudStack MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the CloudStack MCP Server MCP server in PolicyLayer and add a rule for create_firewall_rule: 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 CloudStack MCP Server. Nothing to install.
create_firewall_rule 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 create_firewall_rule 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 create_firewall_rule. 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.
create_firewall_rule is provided by the CloudStack MCP Server MCP server (phantosmax/cloudstack-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CloudStack 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.
45 CloudStack MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.