AI agents call get_navigation_menus to retrieve information from N Lobby MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves UI navigation menu information from the school portal, which is a read-only operation. The blast radius is minimal—exposure of menu structure does not enable unauthorized access to protected data or allow modifications. Classification as Read is appropriate for a simple data retrieval operation.
From the tool's definition Tool name and description indicate a query operation: 'Get main navigation menu list' retrieves navigation structure without modification or execution. No mention of side effects, code execution, or data changes.
Documented attack patterns abuse exactly the kind of access get_navigation_menus gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and N Lobby MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_navigation_menus:
{
"version": "1",
"default": "deny",
"tools": {
"get_navigation_menus": {}
}
}get_navigation_menus is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get main navigation menu list. It is categorised as a Read tool in the N Lobby MCP Server MCP Server, which means it retrieves data without modifying state.
Register the N Lobby MCP Server MCP server in PolicyLayer and add a rule for get_navigation_menus: 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 N Lobby MCP Server. Nothing to install.
get_navigation_menus 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_navigation_menus 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_navigation_menus. 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_navigation_menus is provided by the N Lobby MCP Server MCP server (minagishl/nlobby-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from N Lobby MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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28 N Lobby MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.