Get annual summary data for all monitoring sites within a Core Based Statistical Area (CBSA), which represents metropolitan and micropolitan statistical areas. Annual summaries include yearly statistics such as arithmetic mean, standard deviation, maximum values, percentiles (10th through 99th), ...
AI agents call aqs_annual_summary_by_cbsa to retrieve information from EPA Air Quality System (AQS) 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 air quality monitoring statistics for a geographic region (CBSA). It performs a query operation with no side effects on data—it neither creates, modifies, deletes, nor executes external operations. The data returned are read-only summaries of air quality measurements. Even if misused by an agent, the worst outcome is retrieving unnecessary data, which poses minimal risk.
From the tool's definition Tool name and description: 'Get annual summary data', 'querying air quality data', 'statistics such as arithmetic mean, standard deviation, maximum values'. No verbs indicating data modification, deletion, or execution of code.
Attacks that exploit this kind of access
Get annual summary data for all monitoring sites within a Core Based Statistical Area (CBSA), which represents metropolitan and micropolitan statistical areas. Annual summaries include yearly statistics such as arithmetic mean, standard deviation, maximum values, percentiles (10th through 99th), observation counts, data completeness metrics, and exceedance counts for primary and secondary NAAQS standards. It is categorised as a Read tool in the EPA Air Quality System (AQS) MCP Server MCP Server, which means it retrieves data without modifying state.
Register the EPA Air Quality System (AQS) MCP Server MCP server in PolicyLayer and add a rule for aqs_annual_summary_by_cbsa: 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 EPA Air Quality System (AQS) MCP Server. Nothing to install.
aqs_annual_summary_by_cbsa 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 aqs_annual_summary_by_cbsa 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 aqs_annual_summary_by_cbsa. 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.
aqs_annual_summary_by_cbsa is provided by the EPA Air Quality System (AQS) MCP Server MCP server (tyson-swetnam/aqs-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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