AI agents use rename_device 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.
Renaming a device is a configuration change that modifies data reversibly without deletion or financial impact. It fits the Write category (creates or modifies data reversibly). Severity is medium because misuse could cause operational confusion or break automation scripts that depend on device naming conventions in a security infrastructure context.
From the tool's definition Tool name 'rename_device' indicates modification of device metadata. The parent tool set consists of administrative operations (add_device_to_group, add_interface_to_zone, add_policies_to_block, add_real_device, add_template_to_group), suggesting this tool…
Documented attack patterns abuse exactly the kind of access rename_device 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 rename_device:
{
"version": "1",
"default": "deny",
"tools": {
"rename_device": {
"limits": [
{
"counter": "rename_device_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}rename_device 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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rename_device. 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 rename_device: 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.
rename_device 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 rename_device 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 rename_device. 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.
rename_device 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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