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 Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries pricing data for train journeys without creating transactions, bookings, or financial obligations. It has no side effects beyond returning information to the user. While pricing data could theoretically inform financial decisions, the tool itself does not move money, execute purchases, or commit any financial obligation.
From the tool's definition Tool name 'get_prices' and description 'Get price information' indicates a retrieval operation. The description specifies it 'Returns detailed pricing information' with no mention of modifying, creating, or charging for tickets—only querying public fare data.
Attacks that exploit this kind of access
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 Server MCP Server, which means it retrieves data without modifying state.
Register the NS Travel Information 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 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 Server MCP server (kallivdh/ns-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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