Search for national parks in a specific state
AI agents call searchParksByState 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 information about national parks filtered by state. It performs a lookup/search operation with no side effects, matching the Read category definition. Severity is low because the blast radius of misuse is minimal—returning publicly available park information poses negligible risk. The confidence is high because the operation is clearly informational in nature.
From the tool's definition Tool name 'searchParksByState' and description 'Search for national parks in a specific state' indicate a query/retrieval operation. No modification, deletion, or execution of external operations is described.
Attacks that exploit this kind of access
Search for national parks in a specific state. 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 searchParksByState: 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.
searchParksByState 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 searchParksByState 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 searchParksByState. 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.
searchParksByState 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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