set_fan_speed

THE RISK

Medium Risk

Why set_fan_speed needs a policy

This tool modifies the state of a smart home device (fan speed setting) which is a reversible write operation. Misuse could cause discomfort or energy waste but has limited blast radius.

From the tool's definition Set fan speed on any fan-speed-capable device such as a fan, air conditioner, or purifier.

Documented attack patterns abuse exactly the kind of access set_fan_speed gives an agent:

POLICY

How to control set_fan_speed

PolicyLayer is an MCP gateway — it sits between your AI agents and 米家 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for set_fan_speed:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_fan_speed": {
      "limits": [
        {
          "counter": "set_fan_speed_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

set_fan_speed stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register 米家 MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More 米家 MCP Server tools

Destructive clear_saved_login Clear saved login credentials so the next connection triggers QR login. Execute execute_scene Execute a scene by friendly name or scene id. Execute control_by_intent Route a natural-language-like smart-home request to the best product tool. Execute control_device Control a device through capability operations like turn_on, set_brightness, set_target_te Execute reconnect_service Reconnect to Mijia cloud, optionally clearing saved login first. Execute turn_off_device Turn off a device. Execute turn_on_device Turn on a device. Execute set_cover_position Set position for any cover-capable device such as a curtain or blind.

All 26 米家 MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set_fan_speed

What does the set_fan_speed tool do? +

Set fan speed on any fan-speed-capable device such as a fan, air conditioner, or purifier. It is categorised as a Write tool in the 米家 MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_fan_speed? +

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

What risk level is set_fan_speed? +

set_fan_speed is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_fan_speed? +

Yes. Add a rate_limit block to the set_fan_speed 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_speed completely? +

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

set_fan_speed is provided by the 米家 MCP Server MCP server (javen-yan/miot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every 米家 MCP Server tool call.

Start from 米家 MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →