AI agents call get_nth_policy to retrieve information from Fortimanager without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The naming convention 'get_*' is a strong indicator of a read-only retrieval operation. Although the description is empty and confidence is moderate, the function name itself—retrieving a policy by numeric index—most naturally maps to a data retrieval with no side effects. A FortiManager policy query would return configuration data for inspection/auditing purposes.
From the tool's definition Tool name 'get_nth_policy' suggests retrieval of the nth policy object. No destructive, financial, or code execution keywords present. The sibling tools include many write operations (add_*, add_device_to_group) but this one appears to be a getter.
Documented attack patterns abuse exactly the kind of access get_nth_policy 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 get_nth_policy:
{
"version": "1",
"default": "deny",
"tools": {
"get_nth_policy": {}
}
}get_nth_policy is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_nth_policy. It is categorised as a Read tool in the Fortimanager MCP Server, which means it retrieves data without modifying state.
Register the Fortimanager MCP server in PolicyLayer and add a rule for get_nth_policy: 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.
get_nth_policy is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_nth_policy 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 get_nth_policy. 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.
get_nth_policy 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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