close_window

THE RISK

Critical Risk

Why close_window needs a policy

Closing a window terminates the associated application, potentially losing unsaved data. The 'force' option kills the process outright, which is irreversible. This is at minimum destructive in impact, as killed processes cannot be un-killed and any unsaved state is lost.

From the tool's definition 'Close a window. Use force to kill the process.' — forcibly terminating a process is irreversible and can cause data loss.

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

POLICY

How to control close_window

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

policy.json

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

close_window 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 OODA Computer Control — 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 OODA Computer Control tools

Destructive batch_delete_files Delete multiple files in parallel. Destructive clear_old_logs Delete audit log entries older than specified days. Use dryRun=true to preview. Destructive clipboard_clear Clear the clipboard. Destructive crud_batch_delete Delete multiple records in parallel. Destructive crud_delete Delete a record Destructive delete_file Delete a file or directory. For multiple deletions, use batch_delete_files. Destructive reset_config Reset configuration to defaults. Optionally specify a section to reset only that section. Destructive kill_process Kill a process by PID or name.

All 99 OODA Computer Control 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 OODA Computer Control → 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 close_window

What does the close_window tool do? +

Close a window. Use force to kill the process. It is categorised as a Destructive tool in the OODA Computer Control 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 close_window? +

Register the OODA Computer Control MCP server in PolicyLayer and add a rule for close_window: 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 OODA Computer Control. Nothing to install.

What risk level is close_window? +

close_window 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 close_window? +

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

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

close_window is provided by the OODA Computer Control MCP server (mnehmos/mnehmos.ooda.mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every OODA Computer Control tool call.

Start from OODA Computer Control, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →