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", ...
Single-target operation
Part of the Seoul Essentials MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
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.
tools:
get_subway_timetable:
rules:
- action: allowSee the full Seoul Essentials policy for all 4 tools.
Agents calling read-class tools like get_subway_timetable have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
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.
Add a rule in your Intercept YAML policy under the tools section for get_subway_timetable. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Seoul Essentials MCP server.
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 Intercept 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 Intercept 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). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept