Get daily summary air quality data for all monitoring sites in a Core Based Statistical Area (CBSA). CBSAs are metropolitan or micropolitan statistical areas defined by the US Office of Management and Budget. Daily summaries include arithmetic mean, maximum values, observation counts, and AQI val...
AI agents call aqs_daily_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 purely queries and retrieves air quality monitoring data from the EPA AQS API for a specified geographic area (CBSA). It performs no write operations, data modifications, deletions, code execution, or financial transactions. The returned data (summary statistics) are read-only outputs.
From the tool's definition Tool description states it 'Get[s] daily summary air quality data' with 'arithmetic mean, maximum values, observation counts, and AQI values' — all retrieval operations with no modification, deletion, or execution of external commands.
Attacks that exploit this kind of access
Get daily summary air quality data for all monitoring sites in a Core Based Statistical Area (CBSA). CBSAs are metropolitan or micropolitan statistical areas defined by the US Office of Management and Budget. Daily summaries include arithmetic mean, maximum values, observation counts, and AQI values for each day. 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_daily_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_daily_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_daily_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_daily_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_daily_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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