kill

THE RISK

Critical Risk

Why kill needs a policy

This tool irreversibly terminates a running process and its session. Killing a process is a destructive, non-reversible action - any unsaved state in the TUI application is lost and the process cannot be 'un-killed'. The blast radius is high because misuse could terminate critical running applications or services.

From the tool's definition Terminate a TUI session and its underlying process

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

POLICY

How to control kill

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

policy.json

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

kill 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 Tui — 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 Tui tools

Execute launch Launch a TUI application in a managed pseudo-terminal. Returns a session ID for subsequent Execute wait_for_idle Wait until the terminal buffer stops changing. Useful after sending keys to wait for the a Execute wait_for_text Wait until a regex pattern appears in the terminal buffer. Useful for waiting for prompts, Execute resize Resize the terminal dimensions of a session. The TUI app will receive a SIGWINCH signal. Execute send_keys Send keystrokes to the TUI app. Use this for special keys and shortcuts, not for typing te Execute send_mouse Send a mouse event to the TUI app (if the app has mouse support enabled). Execute send_text Type a string of characters into the TUI app. The text is sent exactly as provided - MCP J Read cursor Get the current cursor position in the terminal.

All 13 Tui 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 Tui → 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 kill

What does the kill tool do? +

Terminate a TUI session and its underlying process. It is categorised as a Destructive tool in the Tui 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 kill? +

Register the Tui MCP server in PolicyLayer and add a rule for kill: 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 Tui. Nothing to install.

What risk level is kill? +

kill 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 kill? +

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

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

kill is provided by the Tui MCP server (nvms/tui-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tui tool call.

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

CHECK YOUR STACK →