Read the current value of a GPIO pin on the FarmBot. Returns the pin value. Digital mode returns 0 or 1, analog mode returns 0-255. Use this to check sensor readings or peripheral states.
AI agents call farmbot_read_pin to retrieve information from Farmbot Agent without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves sensor or peripheral status data from GPIO pins without modifying any state. It performs a query operation typical of Read category tools. The low severity reflects minimal blast radius—misuse would only surface incorrect readings, not cause physical harm or data loss.
From the tool's definition Tool name "farmbot_read_pin" and description "Read the current value of a GPIO pin" explicitly indicates a read operation.
Attacks that exploit this kind of access
Read the current value of a GPIO pin on the FarmBot. Returns the pin value. Digital mode returns 0 or 1, analog mode returns 0-255. Use this to check sensor readings or peripheral states. It is categorised as a Read tool in the Farmbot Agent MCP Server, which means it retrieves data without modifying state.
Register the Farmbot Agent MCP server in PolicyLayer and add a rule for farmbot_read_pin: 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 Farmbot Agent. Nothing to install.
farmbot_read_pin 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 farmbot_read_pin 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 farmbot_read_pin. 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.
farmbot_read_pin is provided by the Farmbot Agent MCP server (kieranklaassen/farmbot-agent-cli-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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