tmux_kill_window
AI agents call tmux_kill_window to permanently remove resources in TmuxControlLib MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
In tmux, 'kill-window' destroys the window and all processes running within its panes. This is an irreversible action — the window, its panes, and any unsaved terminal state are permanently lost. The description is empty, but the name and tmux conventions make the destructive nature clear. Severity is high because misuse could terminate active processes, lose unsaved work, or disrupt running services.
From the tool's definition Tool name 'tmux_kill_window' — 'kill' in the context of tmux means terminating/destroying a window and all its panes irreversibly. Sibling tool 'kill_pane' confirms the pattern of destructive termination operations on this server.
Attacks that exploit this kind of access
tmux_kill_window. It is categorised as a Destructive tool in the TmuxControlLib MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the TmuxControlLib MCP Server MCP server in PolicyLayer and add a rule for tmux_kill_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 TmuxControlLib MCP Server. Nothing to install.
tmux_kill_window is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the tmux_kill_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.
Set action: deny in the PolicyLayer policy for tmux_kill_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.
tmux_kill_window is provided by the TmuxControlLib MCP Server MCP server (jbwinters/tmuxcontrollib). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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