Get all possible values of a query parameter by its name.
AI agents call get_param_values to retrieve information from USDA NASS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs read-only discovery of enumerable parameter values, enabling users to understand available filter options for USDA NASS queries. It retrieves data without creating, modifying, deleting, or executing anything. The blast radius is minimal—users gain visibility into valid parameter choices, which cannot be exploited to cause harm to data or systems.
From the tool's definition Tool retrieves parameter values without modification: 'Get all possible values of a query parameter by its name.' This is a query/lookup operation with no side effects.
Attacks that exploit this kind of access
Get all possible values of a query parameter by its name. It is categorised as a Read tool in the USDA NASS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the USDA NASS MCP Server MCP server in PolicyLayer and add a rule for get_param_values: 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 USDA NASS MCP Server. Nothing to install.
get_param_values 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 get_param_values 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 get_param_values. 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.
get_param_values is provided by the USDA NASS MCP Server MCP server (kin5/nass-mcp-server). 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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