Get detailed weather forecast for a national park by park code
AI agents call getParkWeatherForecast to retrieve information from NPS Explorer 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 weather forecast data for a specified national park. It queries an external weather API and returns forecast information without creating, modifying, deleting, or executing any operations. The input is a park code parameter, and the output is read-only forecast data. This is a straightforward Read operation with minimal risk.
From the tool's definition Tool name is 'getParkWeatherForecast' and description states 'Get detailed weather forecast for a national park by park code' — both indicate data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Get detailed weather forecast for a national park by park code. It is categorised as a Read tool in the NPS Explorer MCP Server MCP Server, which means it retrieves data without modifying state.
Register the NPS Explorer MCP Server MCP server in PolicyLayer and add a rule for getParkWeatherForecast: 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 NPS Explorer MCP Server. Nothing to install.
getParkWeatherForecast 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 getParkWeatherForecast 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 getParkWeatherForecast. 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.
getParkWeatherForecast is provided by the NPS Explorer MCP Server MCP server (kyle-ski/nps-explorer-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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