Get price information for domestic train journeys, including different travel classes, ticket types, and discounts. Returns detailed pricing information with conditions and validity.
AI agents call get_prices to retrieve information from NS Travel Information 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 straightforward query operation to retrieve pricing data from the NS travel information system. It has no side effects, does not modify any data, execute code, perform financial transactions, or delete anything. The blast radius of misuse is minimal — an agent could only retrieve pricing details that are already publicly available travel information.
From the tool's definition Tool description states it retrieves 'price information' and 'Returns detailed pricing information' — it only reads and returns data with no modification, creation, deletion, or execution of external operations.
Documented attack patterns abuse exactly the kind of access get_prices gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and NS Travel Information MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_prices:
{
"version": "1",
"default": "deny",
"tools": {
"get_prices": {}
}
}get_prices is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get price information for domestic train journeys, including different travel classes, ticket types, and discounts. Returns detailed pricing information with conditions and validity. It is categorised as a Read tool in the NS Travel Information MCP Server MCP Server, which means it retrieves data without modifying state.
Register the NS Travel Information MCP Server MCP server in PolicyLayer and add a rule for get_prices: 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 Information MCP Server. Nothing to install.
get_prices 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_prices 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_prices. 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_prices is provided by the NS Travel Information MCP Server MCP server (r-huijts/ns-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 NS Travel Information MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
8 NS Travel Information MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.