AI agents call get_all_stations to retrieve information from Metro MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves publicly available Metro station information (names and geographic coordinates). It performs a query operation with no capability to modify, delete, or execute actions. The data returned is informational only. Blast radius of misuse is minimal—an AI agent could only retrieve station locations, which are public information. No financial, destructive, or code execution capability exists.
From the tool's definition Tool name 'get_all_stations' and description 'Get complete list of all Metro stations with coordinates' indicate retrieval of static station data with no side effects.
Attacks that exploit this kind of access
Get complete list of all Metro stations with coordinates. It is categorised as a Read tool in the Metro MCP MCP Server, which means it retrieves data without modifying state.
Register the Metro MCP server in PolicyLayer and add a rule for get_all_stations: 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 Metro MCP. Nothing to install.
get_all_stations 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_all_stations 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_all_stations. 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_all_stations is provided by the Metro MCP server (nathanielnoyd/metro-mcp). 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.
Teams ship this data inside their own products. See what a licence covers →