Look up city information by name, ID, or coordinates. Returns city ID that can be used with other weather tools.
AI agents call lookupCity to retrieve information from Weather 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 and queries city data without any side effects. It returns information (city IDs) for use by other tools but does not create, modify, delete, or execute anything. The risk of misuse is minimal since incorrect city lookups result only in wrong weather data being fetched downstream, not system compromise or data loss.
From the tool's definition Tool description states it 'Look up city information by name, ID, or coordinates. Returns city ID' — pure data retrieval with no modification, deletion, execution, or financial impact.
Attacks that exploit this kind of access
Look up city information by name, ID, or coordinates. Returns city ID that can be used with other weather tools. It is categorised as a Read tool in the Weather API MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Weather API MCP Server MCP server in PolicyLayer and add a rule for lookupCity: 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 Weather API MCP Server. Nothing to install.
lookupCity 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 lookupCity 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 lookupCity. 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.
lookupCity is provided by the Weather API MCP Server MCP server (yoyooyooo/mcp-weather-server). 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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