machine_poweroff

THE RISK

Critical Risk

Why machine_poweroff needs a policy

Powering off a machine is an irreversible immediate action that terminates all running processes and active state. Any unsaved work or running programs would be lost. This cannot be undone remotely — the machine must be physically powered back on. This is more severe than a Write operation because the power-off state cannot be reversed through the API.

From the tool's definition Power down the machine (U64 only)

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

POLICY

How to control machine_poweroff

PolicyLayer is an MCP gateway — it sits between your AI agents and Commodore 64 Ultimate Computer MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for machine_poweroff:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "machine_poweroff"
  ]
}

machine_poweroff disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Commodore 64 Ultimate Computer 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.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Commodore 64 Ultimate Computer MCP Server tools

Destructive reset_config_to_default Reset configuration to factory defaults Execute drive_reset Reset a specific drive Execute machine_reset Send reset signal to the C64 Execute enter_basic_program Enter a BASIC program directly into C64 memory. Takes BASIC source code text, tokenizes it Execute machine_reboot Restart and reinitialize the Commodore 64 Ultimate device Execute run_crt_file Start a cartridge file from filesystem Execute run_crt_upload Upload and start a cartridge file (base64 or data URL encoded) on the Commodore 64 Ultimat Execute run_prg_file Load and execute a program file from filesystem

All 54 Commodore 64 Ultimate Computer MCP Server tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in Commodore 64 Ultimate Computer MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about machine_poweroff

What does the machine_poweroff tool do? +

Power down the machine (U64 only). It is categorised as a Destructive tool in the Commodore 64 Ultimate Computer MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on machine_poweroff? +

Register the Commodore 64 Ultimate Computer MCP Server MCP server in PolicyLayer and add a rule for machine_poweroff: 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 Commodore 64 Ultimate Computer MCP Server. Nothing to install.

What risk level is machine_poweroff? +

machine_poweroff is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit machine_poweroff? +

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

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

machine_poweroff is provided by the Commodore 64 Ultimate Computer MCP Server MCP server (xphileby/c64u-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Commodore 64 Ultimate Computer MCP Server tool call.

Start from Commodore 64 Ultimate Computer 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 →