AI agents call get_vdom_meta_fields 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 'get' verb combined with 'meta_fields' indicates this tool retrieves or queries metadata about FortiManager virtual domains without modifying data. This is a Read operation. Severity is low because metadata retrieval has minimal blast radius—it exposes configuration information but cannot directly modify systems or cause destructive actions.
From the tool's definition Tool name 'get_vdom_meta_fields' uses the 'get' prefix, indicating data retrieval. 'vdom' refers to virtual domains in FortiManager, and 'meta_fields' suggests querying metadata about those domains.
Documented attack patterns abuse exactly the kind of access get_vdom_meta_fields 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_vdom_meta_fields:
{
"version": "1",
"default": "deny",
"tools": {
"get_vdom_meta_fields": {}
}
}get_vdom_meta_fields is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_vdom_meta_fields. 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_vdom_meta_fields: 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_vdom_meta_fields 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_vdom_meta_fields 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_vdom_meta_fields. 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_vdom_meta_fields 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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