AI agents call list_registers 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 retrieves metadata about device registers. It performs a read-only query operation with no side effects, capability to modify data, or ability to execute operations. The function is purely informational. While the broader server deals with industrial control systems (PLCs) which could be sensitive, this specific tool only lists information and cannot change system state.
From the tool's definition Tool name 'list_registers' and description 'List all registers of a device with metadata' indicate querying/retrieval of register information without modification.
Attacks that exploit this kind of access
List all registers of a device with metadata. 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_registers: 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_registers 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_registers 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_registers. 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_registers 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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