Get a list of available passenger types and discount categories (e.g., adult, child, senior, student discounts).
AI agents call get_passenger_types to retrieve information from Czech Railways (České dráhy) 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 simple data query operation to enumerate passenger discount categories offered by the railway service. It neither modifies data (no Write), executes arbitrary operations (not Execute), deletes data (not Destructive), nor involves financial transactions (not Financial).
From the tool's definition Tool retrieves a list of available passenger types and discount categories. The verb "Get a list" and the nature of the data (enumeration of passenger types) indicates data retrieval with no side effects.
Attacks that exploit this kind of access
Get a list of available passenger types and discount categories (e.g., adult, child, senior, student discounts). It is categorised as a Read tool in the Czech Railways (České dráhy) MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Czech Railways (České dráhy) MCP Server MCP server in PolicyLayer and add a rule for get_passenger_types: 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 Czech Railways (České dráhy) MCP Server. Nothing to install.
get_passenger_types 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_passenger_types 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_passenger_types. 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_passenger_types is provided by the Czech Railways (České dráhy) MCP Server MCP server (janprovaznik/cd-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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