get_live_departures · NS Travel MCP Server MCP

WHAT IT DOES

What get_live_departures does on NS Travel MCP Server

AI agents call get_live_departures to retrieve information from NS Travel MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why get_live_departures needs a policy

This tool retrieves real-time departure data without modifying any systems or data. It is a straightforward query/fetch operation typical of travel information services. No side effects, data modification, code execution, or financial impact. The empty description reduces confidence slightly, but the tool name and server context strongly indicate a read operation with minimal security risk.

From the tool's definition Tool name 'get_live_departures' and server context indicating 'real-time Dutch Railways (NS) data for journey planning, live departures' indicate this retrieves live departure information.

Attacks that exploit this kind of access

Questions about get_live_departures

What does the get_live_departures tool do? +

get_live_departures. It is categorised as a Read tool in the NS Travel MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_live_departures? +

Register the NS Travel MCP Server MCP server in PolicyLayer and add a rule for get_live_departures: 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 NS Travel MCP Server. Nothing to install.

What risk level is get_live_departures? +

get_live_departures is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_live_departures? +

Yes. Add a rate_limit block to the get_live_departures 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.

How do I block get_live_departures completely? +

Set action: deny in the PolicyLayer policy for get_live_departures. 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.

What MCP server provides get_live_departures? +

get_live_departures is provided by the NS Travel MCP Server MCP server (lauragift21/ns-travel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.