Tmux MCP Server

Instructions

Implementation Reference

• src/index.ts:554-569 (handler)

  The handler function for tmux_kill_pane tool. It constructs the target from session, window, and pane, then executes the tmux kill-pane command via runTmux utility.
  async ({ session, window, pane }) => { try { const target = formatTarget(session, window, pane); await runTmux(`kill-pane -t "${target}"`); return { content: [{ type: "text", text: `Pane ${pane} killed successfully.` }], structuredContent: { success: true, session, window, pane }, }; } catch (error) { return { content: [{ type: "text", text: error instanceof Error ? error.message : String(error) }], isError: true, }; } }
• src/index.ts:540-547 (schema)

  Input schema validation for the tmux_kill_pane tool using Zod, defining parameters session, window (optional), and pane.
  inputSchema: z .object({ session: z.string().min(1).describe("Name of the session"), window: z.union([z.string(), z.number()]).optional().describe("Window index or name"), pane: z.number().int().min(0).describe("Pane index"), }) .strict(), annotations: {
• src/index.ts:528-570 (registration)

  Full registration of the tmux_kill_pane tool with McpServer, including title, description, schema, annotations, and handler function.
  server.registerTool( "tmux_kill_pane", { title: "Kill tmux Pane", description: `Kill (close) a pane in a tmux window. Args: - session (string, required): Name of the session - window (string or number, optional): Window index or name - pane (number, required): Pane index WARNING: This will terminate the process running in the pane.`, inputSchema: z .object({ session: z.string().min(1).describe("Name of the session"), window: z.union([z.string(), z.number()]).optional().describe("Window index or name"), pane: z.number().int().min(0).describe("Pane index"), }) .strict(), annotations: { readOnlyHint: false, destructiveHint: true, idempotentHint: true, openWorldHint: false, }, }, async ({ session, window, pane }) => { try { const target = formatTarget(session, window, pane); await runTmux(`kill-pane -t "${target}"`); return { content: [{ type: "text", text: `Pane ${pane} killed successfully.` }], structuredContent: { success: true, session, window, pane }, }; } catch (error) { return { content: [{ type: "text", text: error instanceof Error ? error.message : String(error) }], isError: true, }; } } );
• src/index.ts:70-82 (helper)

  Helper function used by tmux_kill_pane to format the tmux target string (session:window.pane).
  function formatTarget(session?: string, window?: number | string, pane?: number): string { let target = ""; if (session) { target = session; if (window !== undefined) { target += `:${window}`; if (pane !== undefined) { target += `.${pane}`; } } } return target; }
• src/index.ts:45-68 (helper)

  Utility function to execute tmux commands asynchronously, handling common tmux errors gracefully.
  async function runTmux(args: string): Promise<string> { try { const { stdout } = await execAsync(`tmux ${args}`); return stdout.trim(); } catch (error: unknown) { if (error instanceof Error && "stderr" in error) { const stderr = (error as { stderr: string }).stderr; if (stderr.includes("no server running")) { throw new Error("tmux server is not running. Start a session first with tmux_create_session."); } if (stderr.includes("session not found")) { throw new Error("Session not found. Use tmux_list_sessions to see available sessions."); } if (stderr.includes("window not found")) { throw new Error("Window not found. Use tmux_list_windows to see available windows."); } if (stderr.includes("can't find pane")) { throw new Error("Pane not found. Use tmux_list_panes to see available panes."); } throw new Error(`tmux error: ${stderr}`); } throw error; } }