AI agents call get_elevator_incidents 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 queries the WMATA system for accessibility status information. It has no side effects, cannot modify data, and poses no financial or destructive risk. The worst-case misuse would be an AI agent providing outdated or incorrect accessibility information to users, which constitutes a low-severity information accuracy issue rather than a security or operational risk.
From the tool's definition Tool retrieves current elevator and escalator outage information without modifying, deleting, or executing any operations. The name 'get_elevator_incidents' and description 'Get current elevator and escalator outages' indicate a read-only query operation.
Attacks that exploit this kind of access
Get current elevator and escalator outages. 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_elevator_incidents: 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_elevator_incidents 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_elevator_incidents 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_elevator_incidents. 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_elevator_incidents 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.
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