Get Seoul subway timetable for a specific station. Args: station: Station name in Korean or English (e.g., "강남" or "Gangnam", "서울역" or "Seoul Station"). line: Line number (e.g., "1", "2", "3"). If omitted for transfer stations, returns all lines. day_type: Schedule type — "weekday", "saturday", o...
Part of the Seoul Essentials server.
Free to start. No card required.
AI agents call get_subway_timetable to retrieve information from Seoul Essentials without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though get_subway_timetable only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"get_subway_timetable": {}
}
}See the full Seoul Essentials policy for all 4 tools.
These attack patterns abuse exactly the kind of access get_subway_timetable gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Get Seoul subway timetable for a specific station. Args: station: Station name in Korean or English (e.g., "강남" or "Gangnam", "서울역" or "Seoul Station"). line: Line number (e.g., "1", "2", "3"). If omitted for transfer stations, returns all lines. day_type: Schedule type — "weekday", "saturday", or "holiday" (default: "weekday"). direction: Train direction — "up" (toward city center) or "down" (away from center). If omitted, returns both. Returns: Timetable data with departure times, destinations, and transfer line info, or an error message if station not found.. It is categorised as a Read tool in the Seoul Essentials MCP Server, which means it retrieves data without modifying state.
Register the Seoul Essentials MCP server in PolicyLayer and add a rule for get_subway_timetable: 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 Seoul Essentials. Nothing to install.
get_subway_timetable 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_subway_timetable 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_subway_timetable. 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_subway_timetable is provided by the Seoul Essentials MCP server (do-droid/seoul-essentials). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Seoul Essentials tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.