Search for air quality monitoring stations by keyword.
AI agents call search_station to retrieve information from AQICN 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 air quality monitoring stations based on search criteria. It is a query operation with no capability to modify, delete, or trigger external operations. The blast radius of misuse is minimal—an agent could only over-query or request irrelevant stations, which would not cause harm. This is a straightforward Read operation.
From the tool's definition The tool is named 'search_station' and described as 'Search for air quality monitoring stations by keyword.' The verb 'search' and the read-only nature of querying a public monitoring station database indicate no data modification or external side effects.
Attacks that exploit this kind of access
Search for air quality monitoring stations by keyword. It is categorised as a Read tool in the AQICN MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AQICN MCP Server MCP server in PolicyLayer and add a rule for search_station: 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 AQICN MCP Server. Nothing to install.
search_station 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 search_station 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 search_station. 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.
search_station is provided by the AQICN MCP Server MCP server (mattmarcin/aqicn-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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