set_fan_direction · Bond MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_fan_direction does on Bond MCP Server

AI agents invoke set_fan_direction to trigger actions in Bond MCP Server. 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 set_fan_direction needs a policy

This tool triggers an external physical operation on a smart home device (ceiling fan direction change) via the Bond Local API. It's not a simple data read/write but an execution of a command that causes real-world hardware to change state. Misuse could cause discomfort or unintended climate effects, warranting medium severity.

From the tool's definition Set fan direction for a ceiling fan device

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_fan_direction Rate-limited

set_fan_direction 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": {
    "set_fan_direction": {
      "limits": [
        {
          "counter": "set_fan_direction_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 Bond MCP Server, so you can run agents against it safely.

FAQ

Questions about set_fan_direction

What does the set_fan_direction tool do? +

Set fan direction for a ceiling fan device. It is categorised as a Execute tool in the Bond MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on set_fan_direction? +

Register the Bond MCP Server MCP server in PolicyLayer and add a rule for set_fan_direction: 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 Bond MCP Server. Nothing to install.

What risk level is set_fan_direction? +

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

Can I rate-limit set_fan_direction? +

Yes. Add a rate_limit block to the set_fan_direction 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 set_fan_direction completely? +

Set action: deny in the PolicyLayer policy for set_fan_direction. 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 set_fan_direction? +

set_fan_direction is provided by the Bond MCP Server MCP server (madorn/bond-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.