AI agents call get_serial_port to retrieve information from Mcp Utm without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves configuration information (serial port address) from a virtual machine without creating, modifying, deleting, executing, or triggering any operations. It is a simple read/query operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name is 'get_serial_port' and description states 'Get the serial port address of a VM' — purely a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get the serial port address of a VM. It is categorised as a Read tool in the Mcp Utm MCP Server, which means it retrieves data without modifying state.
Register the Mcp Utm MCP server in PolicyLayer and add a rule for get_serial_port: 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 Mcp Utm. Nothing to install.
get_serial_port 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_serial_port 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_serial_port. 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_serial_port is provided by the Mcp Utm MCP server (neverprepared/mcp-utm). 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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