fix(code): support plain exit quit command (#4543)

Typing `exit` in dcode now quits the app without needing a slash
command.

Made by [Open
SWE](https://openswe.vercel.app/agents/211b4c5d-e31a-1941-4047-9412e6dc5319)

---------

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
Co-authored-by: Mason Daugherty <github@mdrxy.com>
Co-authored-by: Mason Daugherty <mason@langchain.dev>

libs/code/deepagents_code/app.py

@@ -7588,6 +7588,16 @@ class DeepAgentsApp(App):
         self.push_screen(dependency_screen)
         return await result_future
 
+    @staticmethod
+    def _is_exit_keyword(value: str, mode: InputMode) -> bool:
+        """Return whether `value` is the bare `exit` keyword in normal mode.
+
+        Matches case-insensitively and ignores surrounding whitespace. Only
+        `normal` mode qualifies, so `exit` typed in shell or command mode is
+        routed normally rather than quitting the app.
+        """
+        return mode == "normal" and value.lower().strip() == "exit"
+
     def _can_bypass_queue(self, value: str) -> bool:
         """Check if a slash command can skip the message queue.
 
@@ -7663,10 +7673,9 @@ class DeepAgentsApp(App):
         # COMMANDS and so carry no bypass tier. Both must run even when the
         # app is busy or wedged, so neither sits behind the queue.
         always_bypass = ALWAYS_IMMEDIATE | HIDDEN_COMMANDS
+        normalized = value.lower().strip()
 
-        if force_bypass or (
-            mode == "command" and value.lower().strip() in always_bypass
-        ):
+        if force_bypass or (mode == "command" and normalized in always_bypass):
             await self._process_message(value, mode)
             return
 
@@ -7717,6 +7726,13 @@ class DeepAgentsApp(App):
 
         await dispatch_hook("user.prompt", {})
 
+        # A bare `exit` quits the app (REPL convention), mirroring `/quit`.
+        # Gated to this interactive path only, so external/scripted callers
+        # (on_external_input) can still send the literal "exit" to the agent.
+        if self._is_exit_keyword(value, mode):
+            self.exit()
+            return
+
         await self._submit_input(value, mode)
 
     async def _dismiss_startup_tip(self) -> None:

libs/code/tests/unit_tests/test_app.py

@@ -11884,6 +11884,76 @@ class TestSlashCommandBypass:
             exit_mock.assert_called_once()
             assert len(app._pending_messages) == 0
 
+    async def test_exit_keyword_exits_from_normal_mode(self) -> None:
+        """Plain exit quits from normal mode, case-insensitive and whitespace-stripped.
+
+        The `  EXIT  ` literal is the only coverage of the `.lower().strip()`
+        normalization; keep the padding and casing when editing this test.
+        """
+        app = DeepAgentsApp()
+        async with app.run_test() as pilot:
+            await pilot.pause()
+
+            with patch.object(app, "exit") as exit_mock:
+                app.post_message(ChatInput.Submitted("  EXIT  ", "normal"))
+                await pilot.pause()
+
+            exit_mock.assert_called_once()
+            assert len(app._pending_messages) == 0
+
+    async def test_exit_keyword_bypasses_queue_when_agent_running(self) -> None:
+        """Plain exit should quit immediately even when the agent is running."""
+        app = DeepAgentsApp()
+        async with app.run_test() as pilot:
+            await pilot.pause()
+            app._agent_running = True
+
+            with patch.object(app, "exit") as exit_mock:
+                app.post_message(ChatInput.Submitted("exit", "normal"))
+                await pilot.pause()
+
+            exit_mock.assert_called_once()
+            assert len(app._pending_messages) == 0
+
+    async def test_exit_keyword_bypasses_thread_switching(self) -> None:
+        """Plain exit should quit even during a thread switch."""
+        app = DeepAgentsApp()
+        async with app.run_test() as pilot:
+            await pilot.pause()
+            app._thread_switching = True
+
+            with patch.object(app, "exit") as exit_mock:
+                app.post_message(ChatInput.Submitted("exit", "normal"))
+                await pilot.pause()
+
+            exit_mock.assert_called_once()
+            assert len(app._pending_messages) == 0
+
+    async def test_exit_keyword_requires_exact_match(self) -> None:
+        """Other messages containing exit should still go to the agent."""
+        app = DeepAgentsApp()
+        async with app.run_test() as pilot:
+            await pilot.pause()
+
+            with (
+                patch.object(app, "exit") as exit_mock,
+                patch.object(
+                    app, "_handle_user_message", new_callable=AsyncMock
+                ) as handler,
+            ):
+                app.post_message(ChatInput.Submitted("exit now", "normal"))
+                await pilot.pause()
+
+            exit_mock.assert_not_called()
+            handler.assert_awaited_once_with("exit now")
+
+    def test_exit_keyword_only_matches_normal_mode(self) -> None:
+        """`exit` quits only in normal mode; shell/command input is untouched."""
+        assert DeepAgentsApp._is_exit_keyword("exit", "normal") is True
+        assert DeepAgentsApp._is_exit_keyword("exit", "shell") is False
+        assert DeepAgentsApp._is_exit_keyword("exit", "shell_incognito") is False
+        assert DeepAgentsApp._is_exit_keyword("exit", "command") is False
+
     async def test_force_clear_bypasses_queue_when_agent_running(self) -> None:
         """/force-clear should process immediately when agent is running."""
         app = DeepAgentsApp()
@@ -11957,6 +12027,28 @@ class TestSlashCommandBypass:
                 QueuedMessage(text="next task", mode="normal")
             ]
 
+    async def test_external_prompt_exit_is_forwarded(self) -> None:
+        """An external `exit` prompt should be sent to the agent, not quit."""
+        app = DeepAgentsApp()
+        async with app.run_test() as pilot:
+            await pilot.pause()
+
+            with (
+                patch.object(app, "exit") as exit_mock,
+                patch.object(
+                    app, "_handle_user_message", new_callable=AsyncMock
+                ) as handler,
+            ):
+                app.post_message(
+                    ExternalInput(
+                        ExternalEvent(kind="prompt", payload="exit", source="test")
+                    )
+                )
+                await pilot.pause()
+
+            exit_mock.assert_not_called()
+            handler.assert_awaited_once_with("exit")
+
     async def test_version_executes_during_connecting(self) -> None:
         """/version should process immediately when only connecting."""
         app = DeepAgentsApp()