Get the currently selected serial port.
AI agents call get_selected_serial_port to retrieve information from ESP-IDF FastMCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves the currently active serial port configuration. It performs a simple read operation with no capability to modify system state, execute commands, or affect external resources. The blast radius of misuse is minimal—an agent could only learn which serial port is configured, which is non-sensitive metadata. This is a straightforward information-retrieval tool.
From the tool's definition Tool name 'get_selected_serial_port' and description 'Get the currently selected serial port' indicate a query operation that retrieves configuration state without modification or side effects.
Attacks that exploit this kind of access
Get the currently selected serial port. It is categorised as a Read tool in the ESP-IDF FastMCP Server MCP Server, which means it retrieves data without modifying state.
Register the ESP-IDF FastMCP Server MCP server in PolicyLayer and add a rule for get_selected_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 ESP-IDF FastMCP Server. Nothing to install.
get_selected_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_selected_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_selected_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_selected_serial_port is provided by the ESP-IDF FastMCP Server MCP server (jasper-zsh/espidf-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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