Check if the specified date (or today if omitted) is an exam day
AI agents call check_exam_day 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 performs a simple read operation against school portal data to determine exam day status. It has no side effects, does not execute code, does not modify data, and does not involve financial transactions. The operation is informational only, consistent with other Read category tools on the server like 'get_calendar_events' and 'get_calendar_filters'.
From the tool's definition Tool name 'check_exam_day' and description 'Check if the specified date (or today if omitted) is an exam day' indicate a query operation that retrieves calendar/schedule information without modifying any data.
Documented attack patterns abuse exactly the kind of access check_exam_day 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 check_exam_day:
{
"version": "1",
"default": "deny",
"tools": {
"check_exam_day": {}
}
}check_exam_day is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check if the specified date (or today if omitted) is an exam day. 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 check_exam_day: 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.
check_exam_day 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 check_exam_day 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 check_exam_day. 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.
check_exam_day 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.