Get a list of air quality monitoring sites within a county with their 4-digit site codes.
AI agents call aqs_list_sites 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 site metadata. It performs a data retrieval operation with no side effects, reversible modifications, external command execution, or destructive actions. The blast radius of misuse is minimal—an agent could only retrieve public environmental monitoring data. This is a standard read operation accessing public EPA databases.
From the tool's definition Tool retrieves "a list of air quality monitoring sites" with "4-digit site codes" - a pure query operation with no modification or execution of external systems.
Attacks that exploit this kind of access
Get a list of air quality monitoring sites within a county with their 4-digit site codes. 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_list_sites: 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_list_sites 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_list_sites 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_list_sites. 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_list_sites 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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