The list of metro stations in the specified city
AI agents call get-metro-stations-in-city to retrieve information from HeadHunter API MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves static geographical reference information (metro station listings) from the HeadHunter platform. It performs a simple query with no capability to modify, delete, or execute operations. The data returned is informational and public in nature. This is a straightforward Read operation with minimal risk regardless of misuse.
From the tool's definition Tool description states 'The list of metro stations in the specified city' - this is a retrieval operation that returns public reference data about metro stations with no side effects.
Attacks that exploit this kind of access
The list of metro stations in the specified city. It is categorised as a Read tool in the HeadHunter API MCP Server MCP Server, which means it retrieves data without modifying state.
Register the HeadHunter API MCP Server MCP server in PolicyLayer and add a rule for get-metro-stations-in-city: 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 HeadHunter API MCP Server. Nothing to install.
get-metro-stations-in-city 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-metro-stations-in-city 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-metro-stations-in-city. 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-metro-stations-in-city is provided by the HeadHunter API MCP Server MCP server (sargonpiraev/hh-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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