diff --git a/src/tools/interactive-bash/constants.ts b/src/tools/interactive-bash/constants.ts
index 67570e4c8..d9fd10853 100644
--- a/src/tools/interactive-bash/constants.ts
+++ b/src/tools/interactive-bash/constants.ts
@@ -11,6 +11,10 @@ export const BLOCKED_TMUX_SUBCOMMANDS = [
   "pipep",
 ]
 
+export const PROHIBITED_TMUX_SUBCOMMANDS = [
+  "kill-server",
+]
+
 export const INTERACTIVE_BASH_DESCRIPTION = `WARNING: This is TMUX ONLY. Pass tmux subcommands directly (without 'tmux' prefix).
 
 Examples: new-session -d -s omo-dev, send-keys -t omo-dev "vim" Enter
diff --git a/src/tools/interactive-bash/tools.test.ts b/src/tools/interactive-bash/tools.test.ts
new file mode 100644
index 000000000..9c0d20249
--- /dev/null
+++ b/src/tools/interactive-bash/tools.test.ts
@@ -0,0 +1,42 @@
+/// <reference types="bun-types" />
+
+import { describe, expect, test } from "bun:test"
+import type { ToolContext } from "@opencode-ai/plugin/tool"
+import { interactive_bash } from "./tools"
+
+const mockContext = {
+  sessionID: "test-session",
+  messageID: "test-message",
+  agent: "test-agent",
+  directory: "/project",
+  worktree: "/project",
+  abort: new AbortController().signal,
+  metadata: () => {},
+  ask: async () => {},
+} satisfies ToolContext
+
+describe("interactive_bash", () => {
+  test("#given kill-server command #when executed #then returns a strong prohibition without running tmux", async () => {
+    // given
+    const args = { tmux_command: "kill-server" }
+
+    // when
+    const output = await interactive_bash.execute(args, mockContext)
+
+    // then
+    expect(output).toContain("Error: 'kill-server' is prohibited in interactive_bash.")
+    expect(output).toContain("NEVER EVER run tmux kill-server from interactive_bash.")
+    expect(output).toContain("Do not retry kill-server with Bash or any other tool.")
+  })
+
+  test("#given kill-server after tmux global options #when executed #then still prohibits it", async () => {
+    // given
+    const args = { tmux_command: "-L omo-socket kill-server" }
+
+    // when
+    const output = await interactive_bash.execute(args, mockContext)
+
+    // then
+    expect(output).toContain("Error: 'kill-server' is prohibited in interactive_bash.")
+  })
+})
diff --git a/src/tools/interactive-bash/tools.ts b/src/tools/interactive-bash/tools.ts
index 21a03cf7f..ba6eee2be 100644
--- a/src/tools/interactive-bash/tools.ts
+++ b/src/tools/interactive-bash/tools.ts
@@ -1,9 +1,16 @@
 import { tool, type ToolDefinition } from "@opencode-ai/plugin/tool"
 import { spawnWithWindowsHide } from "../../shared/spawn-with-windows-hide"
 import { isCmuxCompatEnvironment } from "../../shared/tmux/cmux-detect"
-import { BLOCKED_TMUX_SUBCOMMANDS, DEFAULT_TIMEOUT_MS, INTERACTIVE_BASH_DESCRIPTION } from "./constants"
+import {
+  BLOCKED_TMUX_SUBCOMMANDS,
+  DEFAULT_TIMEOUT_MS,
+  INTERACTIVE_BASH_DESCRIPTION,
+  PROHIBITED_TMUX_SUBCOMMANDS,
+} from "./constants"
 import { getCachedTmuxPath } from "./tmux-path-resolver"
 
+const GLOBAL_TMUX_OPTIONS_WITH_ARGS = new Set(["-L", "-S", "-f", "-c", "-T"])
+
 function resolveTmuxExecutable(tmuxPath: string): string[] {
   if (!isCmuxCompatEnvironment()) {
     return [tmuxPath]
@@ -59,6 +66,84 @@ export function tokenizeCommand(cmd: string): string[] {
   return tokens
 }
 
+function findSubcommandIndex(parts: string[]): number {
+  let index = 0
+  while (index < parts.length) {
+    const part = parts[index] ?? ""
+
+    if (part === "--") {
+      return index + 1 < parts.length ? index + 1 : -1
+    }
+
+    if (GLOBAL_TMUX_OPTIONS_WITH_ARGS.has(part)) {
+      index += 2
+      continue
+    }
+
+    if (part.startsWith("-")) {
+      index++
+      continue
+    }
+
+    return index
+  }
+
+  return -1
+}
+
+function getTargetSessionName(parts: string[]): string {
+  const sessionIdx = parts.findIndex(p => p === "-t" || p.startsWith("-t"))
+  if (sessionIdx === -1) {
+    return "omo-session"
+  }
+
+  const sessionToken = parts[sessionIdx] ?? ""
+  const nextToken = parts[sessionIdx + 1]
+  if (sessionToken === "-t" && nextToken) {
+    return nextToken
+  }
+
+  if (sessionToken.startsWith("-t")) {
+    return sessionToken.slice(2)
+  }
+
+  return "omo-session"
+}
+
+function buildBlockedTmuxCommandMessage(command: string, parts: string[]): string {
+  const sessionName = getTargetSessionName(parts)
+
+  return `Error: '${command}' is blocked in interactive_bash.
+
+**USE BASH TOOL INSTEAD:**
+
+\`\`\`bash
+# Capture terminal output
+tmux capture-pane -p -t ${sessionName}
+
+# Or capture with history (last 1000 lines)
+tmux capture-pane -p -t ${sessionName} -S -1000
+\`\`\`
+
+The Bash tool can execute these commands directly. Do NOT retry with interactive_bash.`
+}
+
+function buildProhibitedTmuxCommandMessage(command: string): string {
+  return `Error: '${command}' is prohibited in interactive_bash.
+
+NEVER EVER run tmux kill-server from interactive_bash.
+
+It terminates the entire tmux server, destroying every tmux session and pane that the user, Codex, or other agents may be using.
+
+Use scoped cleanup only:
+
+\`\`\`bash
+tmux kill-session -t <session-name>
+\`\`\`
+
+If you created an omo-* session, kill only that exact session. Do not retry kill-server with Bash or any other tool.`
+}
+
 export const interactive_bash: ToolDefinition = tool({
   description: INTERACTIVE_BASH_DESCRIPTION,
   args: {
@@ -74,31 +159,16 @@ export const interactive_bash: ToolDefinition = tool({
         return "Error: Empty tmux command"
       }
 
-      const subcommand = parts[0].toLowerCase()
+      const subcommandIndex = findSubcommandIndex(parts)
+      const rawSubcommand = subcommandIndex === -1 ? "" : parts[subcommandIndex]
+      const subcommand = rawSubcommand.toLowerCase()
+
+      if (PROHIBITED_TMUX_SUBCOMMANDS.includes(subcommand)) {
+        return buildProhibitedTmuxCommandMessage(rawSubcommand)
+      }
+
       if (BLOCKED_TMUX_SUBCOMMANDS.includes(subcommand)) {
-        const sessionIdx = parts.findIndex(p => p === "-t" || p.startsWith("-t"))
-        let sessionName = "omo-session"
-        if (sessionIdx !== -1) {
-          if (parts[sessionIdx] === "-t" && parts[sessionIdx + 1]) {
-            sessionName = parts[sessionIdx + 1]
-          } else if (parts[sessionIdx].startsWith("-t")) {
-            sessionName = parts[sessionIdx].slice(2)
-          }
-        }
-
-        return `Error: '${parts[0]}' is blocked in interactive_bash.
-
-**USE BASH TOOL INSTEAD:**
-
-\`\`\`bash
-# Capture terminal output
-tmux capture-pane -p -t ${sessionName}
-
-# Or capture with history (last 1000 lines)
-tmux capture-pane -p -t ${sessionName} -S -1000
-\`\`\`
-
-The Bash tool can execute these commands directly. Do NOT retry with interactive_bash.`
+        return buildBlockedTmuxCommandMessage(rawSubcommand, parts)
       }
 
       const proc = spawnWithWindowsHide([...resolveTmuxExecutable(tmuxPath), ...parts], {