ws_command

Run a raw Home Assistant WebSocket command.

SERVERMcp Control Plane SOURCEalbertik322-sudo/mcp-control-plane

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-control-plane/ws-command.md

WHAT IT DOES

What ws_command does on Mcp Control Plane

AI agents invoke ws_command to trigger actions in Mcp Control Plane. 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.

RISK

Why ws_command is rated High

This tool allows execution of arbitrary Home Assistant commands with effects determined entirely by user input. While not inherently destructive (depends on the command), it enables arbitrary operations on a Home Assistant system (automation, device control, state modifications). Home Assistant controls smart home devices (lights, locks, thermostats, etc.), so misuse could trigger unintended physical actions.

From the tool's definition Tool description states 'Run a raw Home Assistant WebSocket command' — this permits arbitrary command execution against a Home Assistant instance via WebSocket protocol.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs ws_command safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Control Plane, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For ws_command, this is the rule to start with:

ws_command Rate-limited

ws_command 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": {
    "ws_command": {
      "limits": [
        {
          "counter": "ws_command_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Control Plane, apply this rule, and every ws_command call is checked against it from then on.

FAQ

Questions about ws_command

What does the ws_command tool do? +

Run a raw Home Assistant WebSocket command. It is categorised as a Execute tool in the Mcp Control Plane MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ws_command? +

Register the Mcp Control Plane MCP server in PolicyLayer and add a rule for ws_command: 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 Mcp Control Plane. Nothing to install.

What risk level is ws_command? +

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

Can I rate-limit ws_command? +

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

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

ws_command is provided by the Mcp Control Plane MCP server (albertik322-sudo/mcp-control-plane). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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