farmbot_home · Farmbot Agent MCP: Risk & Policy

WHAT IT DOES

What farmbot_home does on Farmbot Agent

AI agents invoke farmbot_home to trigger actions in Farmbot Agent. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why farmbot_home needs a policy

This tool triggers physical hardware movement on the FarmBot device, sending it to the home position. It executes an external operation (mechanical movement) whose effects depend on the current state of the hardware. It's not purely destructive, but it does actuate real-world machinery, which could cause collisions or damage if the device is in an unexpected state.

From the tool's definition Move FarmBot to the home position (0, 0, 0) or home a specific axis. Homes using the device

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

farmbot_home Rate-limited

farmbot_home stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "farmbot_home": {
      "limits": [
        {
          "counter": "farmbot_home_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Farmbot Agent, so you can run agents against it safely.

FAQ

Questions about farmbot_home

What does the farmbot_home tool do? +

Move FarmBot to the home position (0, 0, 0) or home a specific axis. Homes using the device. It is categorised as a Execute tool in the Farmbot Agent MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on farmbot_home? +

Register the Farmbot Agent MCP server in PolicyLayer and add a rule for farmbot_home: 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.

What risk level is farmbot_home? +

farmbot_home is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit farmbot_home? +

Yes. Add a rate_limit block to the farmbot_home 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.

How do I block farmbot_home completely? +

Set action: deny in the PolicyLayer policy for farmbot_home. 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.

What MCP server provides farmbot_home? +

farmbot_home 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.