AI agents use unassign_system_template to create or update resources in Fortimanager — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fortimanager environment.
The name suggests removing or detaching a system template assignment from a device or group in FortiManager. This is likely a reversible Write operation (the template can be reassigned), but it could have significant configuration impact on managed network devices. Confidence is low due to the empty description.
From the tool's definition Tool name: 'unassign_system_template' — no description provided.
Documented attack patterns abuse exactly the kind of access unassign_system_template gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Fortimanager, and nothing reaches the server without passing your rules. This is the rule we recommend for unassign_system_template:
{
"version": "1",
"default": "deny",
"tools": {
"unassign_system_template": {
"limits": [
{
"counter": "unassign_system_template_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unassign_system_template 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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unassign_system_template. It is categorised as a Write tool in the Fortimanager MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Fortimanager MCP server in PolicyLayer and add a rule for unassign_system_template: 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 Fortimanager. Nothing to install.
unassign_system_template 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 unassign_system_template 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 unassign_system_template. 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.
unassign_system_template is provided by the Fortimanager MCP server (jmpijll/fortimanager-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Fortimanager, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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