AI agents call fetch_object_members 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 'fetch' prefix strongly suggests a read-only operation that retrieves object member data from FortiManager without modifying state. However, confidence is moderate (0.75) because the description is empty, preventing definitive confirmation of side effects.
From the tool's definition Tool name 'fetch_object_members' uses the 'fetch' verb, which indicates data retrieval. The sibling tools show patterns of infrastructure management (e.g., 'add_device_to_group', 'add_policies_to_block'), suggesting this tool queries FortiManager…
Documented attack patterns abuse exactly the kind of access fetch_object_members 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 fetch_object_members:
{
"version": "1",
"default": "deny",
"tools": {
"fetch_object_members": {}
}
}fetch_object_members is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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fetch_object_members. 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 fetch_object_members: 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.
fetch_object_members 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 fetch_object_members 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 fetch_object_members. 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.
fetch_object_members 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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