List all fields for a specific farm.
AI agents call list_fields_by_farm to retrieve information from Farm OS 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 field information for a given farm without creating, modifying, deleting, or executing any operations. It is a straightforward read-only query operation with minimal blast radius if misused—the only risk is information disclosure of field inventory data, which is low severity in a farm management context.
From the tool's definition Tool name 'list_fields_by_farm' and description 'List all fields for a specific farm' indicate data retrieval with no modification or execution. The verb 'list' is explicitly a read operation.
Attacks that exploit this kind of access
List all fields for a specific farm. It is categorised as a Read tool in the Farm OS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Farm OS MCP Server MCP server in PolicyLayer and add a rule for list_fields_by_farm: 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 Farm OS MCP Server. Nothing to install.
list_fields_by_farm 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 list_fields_by_farm 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 list_fields_by_farm. 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.
list_fields_by_farm is provided by the Farm OS MCP Server MCP server (ramprasadchauhan/fast-mcp). 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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