Get daily summary air quality data for all monitoring sites in a state. Daily summaries include arithmetic mean, maximum values, observation counts, and AQI values for each day. Requires state FIPS code (2-digit). Note: This can return large amounts of data.
AI agents call aqs_daily_summary_by_state 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 queries and returns air quality monitoring data filtered by state FIPS code. It performs a read-only operation against a public EPA database with no side effects, no data modification, no code execution, and no financial transactions. The only consideration is that it "can return large amounts of data," which is a volume concern rather than a security risk. Even bulk data retrieval remains a Read operation.
From the tool's definition Tool retrieves "daily summary air quality data" with "arithmetic mean, maximum values, observation counts, and AQI values". The verbs are get/retrieve with no modification, deletion, or execution. The description explicitly indicates data retrieval only.
Attacks that exploit this kind of access
Get daily summary air quality data for all monitoring sites in a state. Daily summaries include arithmetic mean, maximum values, observation counts, and AQI values for each day. Requires state FIPS code (2-digit). Note: This can return large amounts of data. 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_state: 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_state 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_state 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_state. 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_state 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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