AI agents call list_devices to retrieve information from Kc Modbus without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries existing device configuration and returns a list—a non-destructive read operation with no side effects. Even in a Modbus environment controlling industrial equipment, merely listing configured devices poses minimal risk; the actual danger lies in tools like write_registers that modify PLC state. Severity is low because it reveals only configuration metadata without enabling control or damage.
From the tool's definition Tool name 'list_devices' and description 'List all configured Modbus devices from the profile' indicate a query operation that retrieves and enumerates configuration data without modification.
Attacks that exploit this kind of access
List all configured Modbus devices from the profile. It is categorised as a Read tool in the Kc Modbus MCP Server, which means it retrieves data without modifying state.
Register the Kc Modbus MCP server in PolicyLayer and add a rule for list_devices: 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 Kc Modbus. Nothing to install.
list_devices 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_devices 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_devices. 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_devices is provided by the Kc Modbus MCP server (kerberosclaw/kc_modbus_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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