List all available cities with weather data
AI agents call list-cities to retrieve information from NestJS MCP Server Module without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of cities—a pure read operation. There is no indication of data modification, deletion, execution of arbitrary code, or financial impact. The low severity reflects the minimal risk of misuse: even if an AI agent calls this repeatedly, it merely retrieves informational data about weather locations.
From the tool's definition Tool name 'list-cities' and description 'List all available cities with weather data' indicate a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
List all available cities with weather data. It is categorised as a Read tool in the NestJS MCP Server Module MCP Server, which means it retrieves data without modifying state.
Register the NestJS MCP Server Module MCP server in PolicyLayer and add a rule for list-cities: 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 NestJS MCP Server Module. Nothing to install.
list-cities 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 list-cities 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 list-cities. 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.
list-cities is provided by the NestJS MCP Server Module MCP server (rekog-labs/mcp-nest). 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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